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<h1>Source code for cassandra.cqlengine.columns</h1><div class="highlight"><pre>
<span></span><span class="c1"># Copyright DataStax, Inc.</span>
<span class="c1">#</span>
<span class="c1"># Licensed under the Apache License, Version 2.0 (the "License");</span>
<span class="c1"># you may not use this file except in compliance with the License.</span>
<span class="c1"># You may obtain a copy of the License at</span>
<span class="c1">#</span>
<span class="c1"># http://www.apache.org/licenses/LICENSE-2.0</span>
<span class="c1">#</span>
<span class="c1"># Unless required by applicable law or agreed to in writing, software</span>
<span class="c1"># distributed under the License is distributed on an "AS IS" BASIS,</span>
<span class="c1"># WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span>
<span class="c1"># See the License for the specific language governing permissions and</span>
<span class="c1"># limitations under the License.</span>
<span class="kn">from</span> <span class="nn">copy</span> <span class="k">import</span> <span class="n">deepcopy</span><span class="p">,</span> <span class="n">copy</span>
<span class="kn">from</span> <span class="nn">datetime</span> <span class="k">import</span> <span class="n">date</span><span class="p">,</span> <span class="n">datetime</span><span class="p">,</span> <span class="n">timedelta</span>
<span class="kn">import</span> <span class="nn">logging</span>
<span class="kn">import</span> <span class="nn">six</span>
<span class="kn">from</span> <span class="nn">uuid</span> <span class="k">import</span> <span class="n">UUID</span> <span class="k">as</span> <span class="n">_UUID</span>
<span class="kn">from</span> <span class="nn">cassandra</span> <span class="k">import</span> <span class="n">util</span>
<span class="kn">from</span> <span class="nn">cassandra.cqltypes</span> <span class="k">import</span> <span class="n">SimpleDateType</span><span class="p">,</span> <span class="n">_cqltypes</span><span class="p">,</span> <span class="n">UserType</span>
<span class="kn">from</span> <span class="nn">cassandra.cqlengine</span> <span class="k">import</span> <span class="n">ValidationError</span>
<span class="kn">from</span> <span class="nn">cassandra.cqlengine.functions</span> <span class="k">import</span> <span class="n">get_total_seconds</span>
<span class="kn">from</span> <span class="nn">cassandra.util</span> <span class="k">import</span> <span class="n">Duration</span> <span class="k">as</span> <span class="n">_Duration</span>
<span class="n">log</span> <span class="o">=</span> <span class="n">logging</span><span class="o">.</span><span class="n">getLogger</span><span class="p">(</span><span class="vm">__name__</span><span class="p">)</span>
<span class="k">class</span> <span class="nc">BaseValueManager</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">instance</span><span class="p">,</span> <span class="n">column</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">instance</span> <span class="o">=</span> <span class="n">instance</span>
<span class="bp">self</span><span class="o">.</span><span class="n">column</span> <span class="o">=</span> <span class="n">column</span>
<span class="bp">self</span><span class="o">.</span><span class="n">value</span> <span class="o">=</span> <span class="n">value</span>
<span class="bp">self</span><span class="o">.</span><span class="n">previous_value</span> <span class="o">=</span> <span class="kc">None</span>
<span class="bp">self</span><span class="o">.</span><span class="n">explicit</span> <span class="o">=</span> <span class="kc">False</span>
<span class="nd">@property</span>
<span class="k">def</span> <span class="nf">deleted</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">column</span><span class="o">.</span><span class="n">_val_is_null</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">value</span><span class="p">)</span> <span class="ow">and</span> <span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">explicit</span> <span class="ow">or</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">column</span><span class="o">.</span><span class="n">_val_is_null</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">previous_value</span><span class="p">))</span>
<span class="nd">@property</span>
<span class="k">def</span> <span class="nf">changed</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Indicates whether or not this value has changed.</span>
<span class="sd"> :rtype: boolean</span>
<span class="sd"> """</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">explicit</span><span class="p">:</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">value</span> <span class="o">!=</span> <span class="bp">self</span><span class="o">.</span><span class="n">previous_value</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">column</span><span class="p">,</span> <span class="n">BaseContainerColumn</span><span class="p">):</span>
<span class="n">default_value</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">column</span><span class="o">.</span><span class="n">get_default</span><span class="p">()</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">column</span><span class="o">.</span><span class="n">_val_is_null</span><span class="p">(</span><span class="n">default_value</span><span class="p">):</span>
<span class="k">return</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">column</span><span class="o">.</span><span class="n">_val_is_null</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">value</span><span class="p">)</span> <span class="ow">and</span> <span class="bp">self</span><span class="o">.</span><span class="n">value</span> <span class="o">!=</span> <span class="bp">self</span><span class="o">.</span><span class="n">previous_value</span>
<span class="k">elif</span> <span class="bp">self</span><span class="o">.</span><span class="n">previous_value</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">value</span> <span class="o">!=</span> <span class="n">default_value</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">value</span> <span class="o">!=</span> <span class="bp">self</span><span class="o">.</span><span class="n">previous_value</span>
<span class="k">return</span> <span class="kc">False</span>
<span class="k">def</span> <span class="nf">reset_previous_value</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">previous_value</span> <span class="o">=</span> <span class="n">deepcopy</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">value</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">getval</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">value</span>
<span class="k">def</span> <span class="nf">setval</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">val</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">value</span> <span class="o">=</span> <span class="n">val</span>
<span class="bp">self</span><span class="o">.</span><span class="n">explicit</span> <span class="o">=</span> <span class="kc">True</span>
<span class="k">def</span> <span class="nf">delval</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">value</span> <span class="o">=</span> <span class="kc">None</span>
<span class="k">def</span> <span class="nf">get_property</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="n">_get</span> <span class="o">=</span> <span class="k">lambda</span> <span class="n">slf</span><span class="p">:</span> <span class="bp">self</span><span class="o">.</span><span class="n">getval</span><span class="p">()</span>
<span class="n">_set</span> <span class="o">=</span> <span class="k">lambda</span> <span class="n">slf</span><span class="p">,</span> <span class="n">val</span><span class="p">:</span> <span class="bp">self</span><span class="o">.</span><span class="n">setval</span><span class="p">(</span><span class="n">val</span><span class="p">)</span>
<span class="n">_del</span> <span class="o">=</span> <span class="k">lambda</span> <span class="n">slf</span><span class="p">:</span> <span class="bp">self</span><span class="o">.</span><span class="n">delval</span><span class="p">()</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">column</span><span class="o">.</span><span class="n">can_delete</span><span class="p">:</span>
<span class="k">return</span> <span class="nb">property</span><span class="p">(</span><span class="n">_get</span><span class="p">,</span> <span class="n">_set</span><span class="p">,</span> <span class="n">_del</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">return</span> <span class="nb">property</span><span class="p">(</span><span class="n">_get</span><span class="p">,</span> <span class="n">_set</span><span class="p">)</span>
<div class="viewcode-block" id="Column"><a class="viewcode-back" href="../../../api/cassandra/cqlengine/columns.html#cassandra.cqlengine.columns.Column">[docs]</a><span class="k">class</span> <span class="nc">Column</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
<span class="c1"># the cassandra type this column maps to</span>
<span class="n">db_type</span> <span class="o">=</span> <span class="kc">None</span>
<span class="n">value_manager</span> <span class="o">=</span> <span class="n">BaseValueManager</span>
<span class="n">instance_counter</span> <span class="o">=</span> <span class="mi">0</span>
<span class="n">_python_type_hashable</span> <span class="o">=</span> <span class="kc">True</span>
<span class="n">primary_key</span> <span class="o">=</span> <span class="kc">False</span>
<span class="sd">"""</span>
<span class="sd"> bool flag, indicates this column is a primary key. The first primary key defined</span>
<span class="sd"> on a model is the partition key (unless partition keys are set), all others are cluster keys</span>
<span class="sd"> """</span>
<span class="n">partition_key</span> <span class="o">=</span> <span class="kc">False</span>
<span class="sd">"""</span>
<span class="sd"> indicates that this column should be the partition key, defining</span>
<span class="sd"> more than one partition key column creates a compound partition key</span>
<span class="sd"> """</span>
<span class="n">index</span> <span class="o">=</span> <span class="kc">False</span>
<span class="sd">"""</span>
<span class="sd"> bool flag, indicates an index should be created for this column</span>
<span class="sd"> """</span>
<span class="n">db_field</span> <span class="o">=</span> <span class="kc">None</span>
<span class="sd">"""</span>
<span class="sd"> the fieldname this field will map to in the database</span>
<span class="sd"> """</span>
<span class="n">default</span> <span class="o">=</span> <span class="kc">None</span>
<span class="sd">"""</span>
<span class="sd"> the default value, can be a value or a callable (no args)</span>
<span class="sd"> """</span>
<span class="n">required</span> <span class="o">=</span> <span class="kc">False</span>
<span class="sd">"""</span>
<span class="sd"> boolean, is the field required? Model validation will raise and</span>
<span class="sd"> exception if required is set to True and there is a None value assigned</span>
<span class="sd"> """</span>
<span class="n">clustering_order</span> <span class="o">=</span> <span class="kc">None</span>
<span class="sd">"""</span>
<span class="sd"> only applicable on clustering keys (primary keys that are not partition keys)</span>
<span class="sd"> determines the order that the clustering keys are sorted on disk</span>
<span class="sd"> """</span>
<span class="n">discriminator_column</span> <span class="o">=</span> <span class="kc">False</span>
<span class="sd">"""</span>
<span class="sd"> boolean, if set to True, this column will be used for discriminating records</span>
<span class="sd"> of inherited models.</span>
<span class="sd"> Should only be set on a column of an abstract model being used for inheritance.</span>
<span class="sd"> There may only be one discriminator column per model. See :attr:`~.__discriminator_value__`</span>
<span class="sd"> for how to specify the value of this column on specialized models.</span>
<span class="sd"> """</span>
<span class="n">static</span> <span class="o">=</span> <span class="kc">False</span>
<span class="sd">"""</span>
<span class="sd"> boolean, if set to True, this is a static column, with a single value per partition</span>
<span class="sd"> """</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span>
<span class="n">primary_key</span><span class="o">=</span><span class="kc">False</span><span class="p">,</span>
<span class="n">partition_key</span><span class="o">=</span><span class="kc">False</span><span class="p">,</span>
<span class="n">index</span><span class="o">=</span><span class="kc">False</span><span class="p">,</span>
<span class="n">db_field</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span>
<span class="n">default</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span>
<span class="n">required</span><span class="o">=</span><span class="kc">False</span><span class="p">,</span>
<span class="n">clustering_order</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span>
<span class="n">discriminator_column</span><span class="o">=</span><span class="kc">False</span><span class="p">,</span>
<span class="n">static</span><span class="o">=</span><span class="kc">False</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">partition_key</span> <span class="o">=</span> <span class="n">partition_key</span>
<span class="bp">self</span><span class="o">.</span><span class="n">primary_key</span> <span class="o">=</span> <span class="n">partition_key</span> <span class="ow">or</span> <span class="n">primary_key</span>
<span class="bp">self</span><span class="o">.</span><span class="n">index</span> <span class="o">=</span> <span class="n">index</span>
<span class="bp">self</span><span class="o">.</span><span class="n">db_field</span> <span class="o">=</span> <span class="n">db_field</span>
<span class="bp">self</span><span class="o">.</span><span class="n">default</span> <span class="o">=</span> <span class="n">default</span>
<span class="bp">self</span><span class="o">.</span><span class="n">required</span> <span class="o">=</span> <span class="n">required</span>
<span class="bp">self</span><span class="o">.</span><span class="n">clustering_order</span> <span class="o">=</span> <span class="n">clustering_order</span>
<span class="bp">self</span><span class="o">.</span><span class="n">discriminator_column</span> <span class="o">=</span> <span class="n">discriminator_column</span>
<span class="c1"># the column name in the model definition</span>
<span class="bp">self</span><span class="o">.</span><span class="n">column_name</span> <span class="o">=</span> <span class="kc">None</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_partition_key_index</span> <span class="o">=</span> <span class="kc">None</span>
<span class="bp">self</span><span class="o">.</span><span class="n">static</span> <span class="o">=</span> <span class="n">static</span>
<span class="bp">self</span><span class="o">.</span><span class="n">value</span> <span class="o">=</span> <span class="kc">None</span>
<span class="c1"># keep track of instantiation order</span>
<span class="bp">self</span><span class="o">.</span><span class="n">position</span> <span class="o">=</span> <span class="n">Column</span><span class="o">.</span><span class="n">instance_counter</span>
<span class="n">Column</span><span class="o">.</span><span class="n">instance_counter</span> <span class="o">+=</span> <span class="mi">1</span>
<span class="k">def</span> <span class="nf">__ne__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">other</span><span class="p">):</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">other</span><span class="p">,</span> <span class="n">Column</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">position</span> <span class="o">!=</span> <span class="n">other</span><span class="o">.</span><span class="n">position</span>
<span class="k">return</span> <span class="bp">NotImplemented</span>
<span class="k">def</span> <span class="nf">__eq__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">other</span><span class="p">):</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">other</span><span class="p">,</span> <span class="n">Column</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">position</span> <span class="o">==</span> <span class="n">other</span><span class="o">.</span><span class="n">position</span>
<span class="k">return</span> <span class="bp">NotImplemented</span>
<span class="k">def</span> <span class="nf">__lt__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">other</span><span class="p">):</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">other</span><span class="p">,</span> <span class="n">Column</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">position</span> <span class="o"><</span> <span class="n">other</span><span class="o">.</span><span class="n">position</span>
<span class="k">return</span> <span class="bp">NotImplemented</span>
<span class="k">def</span> <span class="nf">__le__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">other</span><span class="p">):</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">other</span><span class="p">,</span> <span class="n">Column</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">position</span> <span class="o"><=</span> <span class="n">other</span><span class="o">.</span><span class="n">position</span>
<span class="k">return</span> <span class="bp">NotImplemented</span>
<span class="k">def</span> <span class="nf">__gt__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">other</span><span class="p">):</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">other</span><span class="p">,</span> <span class="n">Column</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">position</span> <span class="o">></span> <span class="n">other</span><span class="o">.</span><span class="n">position</span>
<span class="k">return</span> <span class="bp">NotImplemented</span>
<span class="k">def</span> <span class="nf">__ge__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">other</span><span class="p">):</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">other</span><span class="p">,</span> <span class="n">Column</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">position</span> <span class="o">>=</span> <span class="n">other</span><span class="o">.</span><span class="n">position</span>
<span class="k">return</span> <span class="bp">NotImplemented</span>
<span class="k">def</span> <span class="nf">__hash__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="nb">id</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">validate</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Returns a cleaned and validated value. Raises a ValidationError</span>
<span class="sd"> if there's a problem</span>
<span class="sd"> """</span>
<span class="k">if</span> <span class="n">value</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">required</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">ValidationError</span><span class="p">(</span><span class="s1">'</span><span class="si">{0}</span><span class="s1"> - None values are not allowed'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">column_name</span> <span class="ow">or</span> <span class="bp">self</span><span class="o">.</span><span class="n">db_field</span><span class="p">))</span>
<span class="k">return</span> <span class="n">value</span>
<span class="k">def</span> <span class="nf">to_python</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Converts data from the database into python values</span>
<span class="sd"> raises a ValidationError if the value can't be converted</span>
<span class="sd"> """</span>
<span class="k">return</span> <span class="n">value</span>
<span class="k">def</span> <span class="nf">to_database</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Converts python value into database value</span>
<span class="sd"> """</span>
<span class="k">return</span> <span class="n">value</span>
<span class="nd">@property</span>
<span class="k">def</span> <span class="nf">has_default</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">default</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span>
<span class="nd">@property</span>
<span class="k">def</span> <span class="nf">is_primary_key</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">primary_key</span>
<span class="nd">@property</span>
<span class="k">def</span> <span class="nf">can_delete</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">primary_key</span>
<span class="k">def</span> <span class="nf">get_default</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">has_default</span><span class="p">:</span>
<span class="k">if</span> <span class="n">callable</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">default</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">default</span><span class="p">()</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">default</span>
<span class="k">def</span> <span class="nf">get_column_def</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Returns a column definition for CQL table definition</span>
<span class="sd"> """</span>
<span class="n">static</span> <span class="o">=</span> <span class="s2">"static"</span> <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">static</span> <span class="k">else</span> <span class="s2">""</span>
<span class="k">return</span> <span class="s1">'</span><span class="si">{0}</span><span class="s1"> </span><span class="si">{1}</span><span class="s1"> </span><span class="si">{2}</span><span class="s1">'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">cql</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">db_type</span><span class="p">,</span> <span class="n">static</span><span class="p">)</span>
<span class="c1"># TODO: make columns use cqltypes under the hood</span>
<span class="c1"># until then, this bridges the gap in using types along with cassandra.metadata for CQL generation</span>
<span class="k">def</span> <span class="nf">cql_parameterized_type</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">db_type</span>
<span class="k">def</span> <span class="nf">set_column_name</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">name</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Sets the column name during document class construction</span>
<span class="sd"> This value will be ignored if db_field is set in __init__</span>
<span class="sd"> """</span>
<span class="bp">self</span><span class="o">.</span><span class="n">column_name</span> <span class="o">=</span> <span class="n">name</span>
<span class="nd">@property</span>
<span class="k">def</span> <span class="nf">db_field_name</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="sd">""" Returns the name of the cql name of this column """</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">db_field</span> <span class="ow">or</span> <span class="bp">self</span><span class="o">.</span><span class="n">column_name</span>
<span class="nd">@property</span>
<span class="k">def</span> <span class="nf">db_index_name</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="sd">""" Returns the name of the cql index """</span>
<span class="k">return</span> <span class="s1">'index_</span><span class="si">{0}</span><span class="s1">'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">db_field_name</span><span class="p">)</span>
<span class="nd">@property</span>
<span class="k">def</span> <span class="nf">cql</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">get_cql</span><span class="p">()</span>
<span class="k">def</span> <span class="nf">get_cql</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="s1">'"</span><span class="si">{0}</span><span class="s1">"'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">db_field_name</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">_val_is_null</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">val</span><span class="p">):</span>
<span class="sd">""" determines if the given value equates to a null value for the given column type """</span>
<span class="k">return</span> <span class="n">val</span> <span class="ow">is</span> <span class="kc">None</span>
<span class="nd">@property</span>
<span class="k">def</span> <span class="nf">sub_types</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="p">[]</span>
<span class="nd">@property</span>
<span class="k">def</span> <span class="nf">cql_type</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="n">_cqltypes</span><span class="p">[</span><span class="bp">self</span><span class="o">.</span><span class="n">db_type</span><span class="p">]</span></div>
<div class="viewcode-block" id="Blob"><a class="viewcode-back" href="../../../api/cassandra/cqlengine/columns.html#cassandra.cqlengine.columns.Blob">[docs]</a><span class="k">class</span> <span class="nc">Blob</span><span class="p">(</span><span class="n">Column</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Stores a raw binary value</span>
<span class="sd"> """</span>
<span class="n">db_type</span> <span class="o">=</span> <span class="s1">'blob'</span>
<span class="k">def</span> <span class="nf">to_database</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
<span class="k">if</span> <span class="ow">not</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">value</span><span class="p">,</span> <span class="p">(</span><span class="n">six</span><span class="o">.</span><span class="n">binary_type</span><span class="p">,</span> <span class="nb">bytearray</span><span class="p">)):</span>
<span class="k">raise</span> <span class="ne">Exception</span><span class="p">(</span><span class="s2">"expecting a binary, got a </span><span class="si">%s</span><span class="s2">"</span> <span class="o">%</span> <span class="nb">type</span><span class="p">(</span><span class="n">value</span><span class="p">))</span>
<span class="n">val</span> <span class="o">=</span> <span class="nb">super</span><span class="p">(</span><span class="n">Bytes</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">to_database</span><span class="p">(</span><span class="n">value</span><span class="p">)</span>
<span class="k">return</span> <span class="nb">bytearray</span><span class="p">(</span><span class="n">val</span><span class="p">)</span></div>
<span class="n">Bytes</span> <span class="o">=</span> <span class="n">Blob</span>
<span class="k">class</span> <span class="nc">Inet</span><span class="p">(</span><span class="n">Column</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Stores an IP address in IPv4 or IPv6 format</span>
<span class="sd"> """</span>
<span class="n">db_type</span> <span class="o">=</span> <span class="s1">'inet'</span>
<div class="viewcode-block" id="Text"><a class="viewcode-back" href="../../../api/cassandra/cqlengine/columns.html#cassandra.cqlengine.columns.Text">[docs]</a><span class="k">class</span> <span class="nc">Text</span><span class="p">(</span><span class="n">Column</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Stores a UTF-8 encoded string</span>
<span class="sd"> """</span>
<span class="n">db_type</span> <span class="o">=</span> <span class="s1">'text'</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">min_length</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">max_length</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> :param int min_length: Sets the minimum length of this string, for validation purposes.</span>
<span class="sd"> Defaults to 1 if this is a ``required`` column. Otherwise, None.</span>
<span class="sd"> :param int max_length: Sets the maximum length of this string, for validation purposes.</span>
<span class="sd"> """</span>
<span class="bp">self</span><span class="o">.</span><span class="n">min_length</span> <span class="o">=</span> <span class="p">(</span>
<span class="mi">1</span> <span class="k">if</span> <span class="n">min_length</span> <span class="ow">is</span> <span class="kc">None</span> <span class="ow">and</span> <span class="n">kwargs</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">'required'</span><span class="p">,</span> <span class="kc">False</span><span class="p">)</span>
<span class="k">else</span> <span class="n">min_length</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">max_length</span> <span class="o">=</span> <span class="n">max_length</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">min_length</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">min_length</span> <span class="o"><</span> <span class="mi">0</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span>
<span class="s1">'Minimum length is not allowed to be negative.'</span><span class="p">)</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">max_length</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">max_length</span> <span class="o"><</span> <span class="mi">0</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span>
<span class="s1">'Maximum length is not allowed to be negative.'</span><span class="p">)</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">min_length</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span> <span class="ow">and</span> <span class="bp">self</span><span class="o">.</span><span class="n">max_length</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">max_length</span> <span class="o"><</span> <span class="bp">self</span><span class="o">.</span><span class="n">min_length</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span>
<span class="s1">'Maximum length must be greater or equal '</span>
<span class="s1">'to minimum length.'</span><span class="p">)</span>
<span class="nb">super</span><span class="p">(</span><span class="n">Text</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span><span class="o">**</span><span class="n">kwargs</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">validate</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
<span class="n">value</span> <span class="o">=</span> <span class="nb">super</span><span class="p">(</span><span class="n">Text</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">validate</span><span class="p">(</span><span class="n">value</span><span class="p">)</span>
<span class="k">if</span> <span class="ow">not</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">value</span><span class="p">,</span> <span class="p">(</span><span class="n">six</span><span class="o">.</span><span class="n">string_types</span><span class="p">,</span> <span class="nb">bytearray</span><span class="p">))</span> <span class="ow">and</span> <span class="n">value</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">ValidationError</span><span class="p">(</span><span class="s1">'</span><span class="si">{0}</span><span class="s1"> </span><span class="si">{1}</span><span class="s1"> is not a string'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">column_name</span><span class="p">,</span> <span class="nb">type</span><span class="p">(</span><span class="n">value</span><span class="p">)))</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">max_length</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">if</span> <span class="n">value</span> <span class="ow">and</span> <span class="nb">len</span><span class="p">(</span><span class="n">value</span><span class="p">)</span> <span class="o">></span> <span class="bp">self</span><span class="o">.</span><span class="n">max_length</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">ValidationError</span><span class="p">(</span><span class="s1">'</span><span class="si">{0}</span><span class="s1"> is longer than </span><span class="si">{1}</span><span class="s1"> characters'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">column_name</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">max_length</span><span class="p">))</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">min_length</span><span class="p">:</span>
<span class="k">if</span> <span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">min_length</span> <span class="ow">and</span> <span class="ow">not</span> <span class="n">value</span><span class="p">)</span> <span class="ow">or</span> <span class="nb">len</span><span class="p">(</span><span class="n">value</span><span class="p">)</span> <span class="o"><</span> <span class="bp">self</span><span class="o">.</span><span class="n">min_length</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">ValidationError</span><span class="p">(</span><span class="s1">'</span><span class="si">{0}</span><span class="s1"> is shorter than </span><span class="si">{1}</span><span class="s1"> characters'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">column_name</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">min_length</span><span class="p">))</span>
<span class="k">return</span> <span class="n">value</span></div>
<div class="viewcode-block" id="Ascii"><a class="viewcode-back" href="../../../api/cassandra/cqlengine/columns.html#cassandra.cqlengine.columns.Ascii">[docs]</a><span class="k">class</span> <span class="nc">Ascii</span><span class="p">(</span><span class="n">Text</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Stores a US-ASCII character string</span>
<span class="sd"> """</span>
<span class="n">db_type</span> <span class="o">=</span> <span class="s1">'ascii'</span>
<span class="k">def</span> <span class="nf">validate</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
<span class="sd">""" Only allow ASCII and None values.</span>
<span class="sd"> Check against US-ASCII, a.k.a. 7-bit ASCII, a.k.a. ISO646-US, a.k.a.</span>
<span class="sd"> the Basic Latin block of the Unicode character set.</span>
<span class="sd"> Source: https://github.com/apache/cassandra/blob</span>
<span class="sd"> /3dcbe90e02440e6ee534f643c7603d50ca08482b/src/java/org/apache/cassandra</span>
<span class="sd"> /serializers/AsciiSerializer.java#L29</span>
<span class="sd"> """</span>
<span class="n">value</span> <span class="o">=</span> <span class="nb">super</span><span class="p">(</span><span class="n">Ascii</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">validate</span><span class="p">(</span><span class="n">value</span><span class="p">)</span>
<span class="k">if</span> <span class="n">value</span><span class="p">:</span>
<span class="n">charset</span> <span class="o">=</span> <span class="n">value</span> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span>
<span class="n">value</span><span class="p">,</span> <span class="p">(</span><span class="nb">bytearray</span><span class="p">,</span> <span class="p">))</span> <span class="k">else</span> <span class="nb">map</span><span class="p">(</span><span class="nb">ord</span><span class="p">,</span> <span class="n">value</span><span class="p">)</span>
<span class="k">if</span> <span class="ow">not</span> <span class="nb">set</span><span class="p">(</span><span class="nb">range</span><span class="p">(</span><span class="mi">128</span><span class="p">))</span><span class="o">.</span><span class="n">issuperset</span><span class="p">(</span><span class="n">charset</span><span class="p">):</span>
<span class="k">raise</span> <span class="n">ValidationError</span><span class="p">(</span>
<span class="s1">'</span><span class="si">{!r}</span><span class="s1"> is not an ASCII string.'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">value</span><span class="p">))</span>
<span class="k">return</span> <span class="n">value</span></div>
<div class="viewcode-block" id="Integer"><a class="viewcode-back" href="../../../api/cassandra/cqlengine/columns.html#cassandra.cqlengine.columns.Integer">[docs]</a><span class="k">class</span> <span class="nc">Integer</span><span class="p">(</span><span class="n">Column</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Stores a 32-bit signed integer value</span>
<span class="sd"> """</span>
<span class="n">db_type</span> <span class="o">=</span> <span class="s1">'int'</span>
<span class="k">def</span> <span class="nf">validate</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
<span class="n">val</span> <span class="o">=</span> <span class="nb">super</span><span class="p">(</span><span class="n">Integer</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">validate</span><span class="p">(</span><span class="n">value</span><span class="p">)</span>
<span class="k">if</span> <span class="n">val</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">return</span>
<span class="k">try</span><span class="p">:</span>
<span class="k">return</span> <span class="nb">int</span><span class="p">(</span><span class="n">val</span><span class="p">)</span>
<span class="k">except</span> <span class="p">(</span><span class="ne">TypeError</span><span class="p">,</span> <span class="ne">ValueError</span><span class="p">):</span>
<span class="k">raise</span> <span class="n">ValidationError</span><span class="p">(</span><span class="s2">"</span><span class="si">{0}</span><span class="s2"> </span><span class="si">{1}</span><span class="s2"> can't be converted to integral value"</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">column_name</span><span class="p">,</span> <span class="n">value</span><span class="p">))</span>
<span class="k">def</span> <span class="nf">to_python</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">validate</span><span class="p">(</span><span class="n">value</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">to_database</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">validate</span><span class="p">(</span><span class="n">value</span><span class="p">)</span></div>
<div class="viewcode-block" id="TinyInt"><a class="viewcode-back" href="../../../api/cassandra/cqlengine/columns.html#cassandra.cqlengine.columns.TinyInt">[docs]</a><span class="k">class</span> <span class="nc">TinyInt</span><span class="p">(</span><span class="n">Integer</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Stores an 8-bit signed integer value</span>
<span class="sd"> .. versionadded:: 2.6.0</span>
<span class="sd"> requires C* 2.2+ and protocol v4+</span>
<span class="sd"> """</span>
<span class="n">db_type</span> <span class="o">=</span> <span class="s1">'tinyint'</span></div>
<div class="viewcode-block" id="SmallInt"><a class="viewcode-back" href="../../../api/cassandra/cqlengine/columns.html#cassandra.cqlengine.columns.SmallInt">[docs]</a><span class="k">class</span> <span class="nc">SmallInt</span><span class="p">(</span><span class="n">Integer</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Stores a 16-bit signed integer value</span>
<span class="sd"> .. versionadded:: 2.6.0</span>
<span class="sd"> requires C* 2.2+ and protocol v4+</span>
<span class="sd"> """</span>
<span class="n">db_type</span> <span class="o">=</span> <span class="s1">'smallint'</span></div>
<div class="viewcode-block" id="BigInt"><a class="viewcode-back" href="../../../api/cassandra/cqlengine/columns.html#cassandra.cqlengine.columns.BigInt">[docs]</a><span class="k">class</span> <span class="nc">BigInt</span><span class="p">(</span><span class="n">Integer</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Stores a 64-bit signed integer value</span>
<span class="sd"> """</span>
<span class="n">db_type</span> <span class="o">=</span> <span class="s1">'bigint'</span></div>
<div class="viewcode-block" id="VarInt"><a class="viewcode-back" href="../../../api/cassandra/cqlengine/columns.html#cassandra.cqlengine.columns.VarInt">[docs]</a><span class="k">class</span> <span class="nc">VarInt</span><span class="p">(</span><span class="n">Column</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Stores an arbitrary-precision integer</span>
<span class="sd"> """</span>
<span class="n">db_type</span> <span class="o">=</span> <span class="s1">'varint'</span>
<span class="k">def</span> <span class="nf">validate</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
<span class="n">val</span> <span class="o">=</span> <span class="nb">super</span><span class="p">(</span><span class="n">VarInt</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">validate</span><span class="p">(</span><span class="n">value</span><span class="p">)</span>
<span class="k">if</span> <span class="n">val</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">return</span>
<span class="k">try</span><span class="p">:</span>
<span class="k">return</span> <span class="nb">int</span><span class="p">(</span><span class="n">val</span><span class="p">)</span>
<span class="k">except</span> <span class="p">(</span><span class="ne">TypeError</span><span class="p">,</span> <span class="ne">ValueError</span><span class="p">):</span>
<span class="k">raise</span> <span class="n">ValidationError</span><span class="p">(</span>
<span class="s2">"</span><span class="si">{0}</span><span class="s2"> </span><span class="si">{1}</span><span class="s2"> can't be converted to integral value"</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">column_name</span><span class="p">,</span> <span class="n">value</span><span class="p">))</span>
<span class="k">def</span> <span class="nf">to_python</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">validate</span><span class="p">(</span><span class="n">value</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">to_database</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">validate</span><span class="p">(</span><span class="n">value</span><span class="p">)</span></div>
<span class="k">class</span> <span class="nc">CounterValueManager</span><span class="p">(</span><span class="n">BaseValueManager</span><span class="p">):</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">instance</span><span class="p">,</span> <span class="n">column</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
<span class="nb">super</span><span class="p">(</span><span class="n">CounterValueManager</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span><span class="n">instance</span><span class="p">,</span> <span class="n">column</span><span class="p">,</span> <span class="n">value</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">value</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">value</span> <span class="ow">or</span> <span class="mi">0</span>
<span class="bp">self</span><span class="o">.</span><span class="n">previous_value</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">previous_value</span> <span class="ow">or</span> <span class="mi">0</span>
<div class="viewcode-block" id="Counter"><a class="viewcode-back" href="../../../api/cassandra/cqlengine/columns.html#cassandra.cqlengine.columns.Counter">[docs]</a><span class="k">class</span> <span class="nc">Counter</span><span class="p">(</span><span class="n">Integer</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Stores a counter that can be incremented and decremented</span>
<span class="sd"> """</span>
<span class="n">db_type</span> <span class="o">=</span> <span class="s1">'counter'</span>
<span class="n">value_manager</span> <span class="o">=</span> <span class="n">CounterValueManager</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span>
<span class="n">index</span><span class="o">=</span><span class="kc">False</span><span class="p">,</span>
<span class="n">db_field</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span>
<span class="n">required</span><span class="o">=</span><span class="kc">False</span><span class="p">):</span>
<span class="nb">super</span><span class="p">(</span><span class="n">Counter</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span>
<span class="n">primary_key</span><span class="o">=</span><span class="kc">False</span><span class="p">,</span>
<span class="n">partition_key</span><span class="o">=</span><span class="kc">False</span><span class="p">,</span>
<span class="n">index</span><span class="o">=</span><span class="n">index</span><span class="p">,</span>
<span class="n">db_field</span><span class="o">=</span><span class="n">db_field</span><span class="p">,</span>
<span class="n">default</span><span class="o">=</span><span class="mi">0</span><span class="p">,</span>
<span class="n">required</span><span class="o">=</span><span class="n">required</span><span class="p">,</span>
<span class="p">)</span></div>
<div class="viewcode-block" id="DateTime"><a class="viewcode-back" href="../../../api/cassandra/cqlengine/columns.html#cassandra.cqlengine.columns.DateTime">[docs]</a><span class="k">class</span> <span class="nc">DateTime</span><span class="p">(</span><span class="n">Column</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Stores a datetime value</span>
<span class="sd"> """</span>
<span class="n">db_type</span> <span class="o">=</span> <span class="s1">'timestamp'</span>
<span class="n">truncate_microseconds</span> <span class="o">=</span> <span class="kc">False</span>
<span class="sd">"""</span>
<span class="sd"> Set this ``True`` to have model instances truncate the date, quantizing it in the same way it will be in the database.</span>
<span class="sd"> This allows equality comparison between assigned values and values read back from the database::</span>
<span class="sd"> DateTime.truncate_microseconds = True</span>
<span class="sd"> assert Model.create(id=0, d=datetime.utcnow()) == Model.objects(id=0).first()</span>
<span class="sd"> Defaults to ``False`` to preserve legacy behavior. May change in the future.</span>
<span class="sd"> """</span>
<span class="k">def</span> <span class="nf">to_python</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
<span class="k">if</span> <span class="n">value</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">return</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">value</span><span class="p">,</span> <span class="n">datetime</span><span class="p">):</span>
<span class="k">if</span> <span class="n">DateTime</span><span class="o">.</span><span class="n">truncate_microseconds</span><span class="p">:</span>
<span class="n">us</span> <span class="o">=</span> <span class="n">value</span><span class="o">.</span><span class="n">microsecond</span>
<span class="n">truncated_us</span> <span class="o">=</span> <span class="n">us</span> <span class="o">//</span> <span class="mi">1000</span> <span class="o">*</span> <span class="mi">1000</span>
<span class="k">return</span> <span class="n">value</span> <span class="o">-</span> <span class="n">timedelta</span><span class="p">(</span><span class="n">microseconds</span><span class="o">=</span><span class="n">us</span> <span class="o">-</span> <span class="n">truncated_us</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">return</span> <span class="n">value</span>
<span class="k">elif</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">value</span><span class="p">,</span> <span class="n">date</span><span class="p">):</span>
<span class="k">return</span> <span class="n">datetime</span><span class="p">(</span><span class="o">*</span><span class="p">(</span><span class="n">value</span><span class="o">.</span><span class="n">timetuple</span><span class="p">()[:</span><span class="mi">6</span><span class="p">]))</span>
<span class="k">return</span> <span class="n">datetime</span><span class="o">.</span><span class="n">utcfromtimestamp</span><span class="p">(</span><span class="n">value</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">to_database</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
<span class="n">value</span> <span class="o">=</span> <span class="nb">super</span><span class="p">(</span><span class="n">DateTime</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">to_database</span><span class="p">(</span><span class="n">value</span><span class="p">)</span>
<span class="k">if</span> <span class="n">value</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">return</span>
<span class="k">if</span> <span class="ow">not</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">value</span><span class="p">,</span> <span class="n">datetime</span><span class="p">):</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">value</span><span class="p">,</span> <span class="n">date</span><span class="p">):</span>
<span class="n">value</span> <span class="o">=</span> <span class="n">datetime</span><span class="p">(</span><span class="n">value</span><span class="o">.</span><span class="n">year</span><span class="p">,</span> <span class="n">value</span><span class="o">.</span><span class="n">month</span><span class="p">,</span> <span class="n">value</span><span class="o">.</span><span class="n">day</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">ValidationError</span><span class="p">(</span><span class="s2">"</span><span class="si">{0}</span><span class="s2"> '</span><span class="si">{1}</span><span class="s2">' is not a datetime object"</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">column_name</span><span class="p">,</span> <span class="n">value</span><span class="p">))</span>
<span class="n">epoch</span> <span class="o">=</span> <span class="n">datetime</span><span class="p">(</span><span class="mi">1970</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="n">tzinfo</span><span class="o">=</span><span class="n">value</span><span class="o">.</span><span class="n">tzinfo</span><span class="p">)</span>
<span class="n">offset</span> <span class="o">=</span> <span class="n">get_total_seconds</span><span class="p">(</span><span class="n">epoch</span><span class="o">.</span><span class="n">tzinfo</span><span class="o">.</span><span class="n">utcoffset</span><span class="p">(</span><span class="n">epoch</span><span class="p">))</span> <span class="k">if</span> <span class="n">epoch</span><span class="o">.</span><span class="n">tzinfo</span> <span class="k">else</span> <span class="mi">0</span>
<span class="k">return</span> <span class="nb">int</span><span class="p">((</span><span class="n">get_total_seconds</span><span class="p">(</span><span class="n">value</span> <span class="o">-</span> <span class="n">epoch</span><span class="p">)</span> <span class="o">-</span> <span class="n">offset</span><span class="p">)</span> <span class="o">*</span> <span class="mi">1000</span><span class="p">)</span></div>
<div class="viewcode-block" id="Date"><a class="viewcode-back" href="../../../api/cassandra/cqlengine/columns.html#cassandra.cqlengine.columns.Date">[docs]</a><span class="k">class</span> <span class="nc">Date</span><span class="p">(</span><span class="n">Column</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Stores a simple date, with no time-of-day</span>
<span class="sd"> .. versionchanged:: 2.6.0</span>
<span class="sd"> removed overload of Date and DateTime. DateTime is a drop-in replacement for legacy models</span>
<span class="sd"> requires C* 2.2+ and protocol v4+</span>
<span class="sd"> """</span>
<span class="n">db_type</span> <span class="o">=</span> <span class="s1">'date'</span>
<span class="k">def</span> <span class="nf">to_database</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
<span class="k">if</span> <span class="n">value</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">return</span>
<span class="c1"># need to translate to int version because some dates are not representable in</span>
<span class="c1"># string form (datetime limitation)</span>
<span class="n">d</span> <span class="o">=</span> <span class="n">value</span> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">value</span><span class="p">,</span> <span class="n">util</span><span class="o">.</span><span class="n">Date</span><span class="p">)</span> <span class="k">else</span> <span class="n">util</span><span class="o">.</span><span class="n">Date</span><span class="p">(</span><span class="n">value</span><span class="p">)</span>
<span class="k">return</span> <span class="n">d</span><span class="o">.</span><span class="n">days_from_epoch</span> <span class="o">+</span> <span class="n">SimpleDateType</span><span class="o">.</span><span class="n">EPOCH_OFFSET_DAYS</span>
<span class="k">def</span> <span class="nf">to_python</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
<span class="k">if</span> <span class="n">value</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">return</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">value</span><span class="p">,</span> <span class="n">util</span><span class="o">.</span><span class="n">Date</span><span class="p">):</span>
<span class="k">return</span> <span class="n">value</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">value</span><span class="p">,</span> <span class="n">datetime</span><span class="p">):</span>
<span class="n">value</span> <span class="o">=</span> <span class="n">value</span><span class="o">.</span><span class="n">date</span><span class="p">()</span>
<span class="k">return</span> <span class="n">util</span><span class="o">.</span><span class="n">Date</span><span class="p">(</span><span class="n">value</span><span class="p">)</span></div>
<div class="viewcode-block" id="Time"><a class="viewcode-back" href="../../../api/cassandra/cqlengine/columns.html#cassandra.cqlengine.columns.Time">[docs]</a><span class="k">class</span> <span class="nc">Time</span><span class="p">(</span><span class="n">Column</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Stores a timezone-naive time-of-day, with nanosecond precision</span>
<span class="sd"> .. versionadded:: 2.6.0</span>
<span class="sd"> requires C* 2.2+ and protocol v4+</span>
<span class="sd"> """</span>
<span class="n">db_type</span> <span class="o">=</span> <span class="s1">'time'</span>
<span class="k">def</span> <span class="nf">to_database</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
<span class="n">value</span> <span class="o">=</span> <span class="nb">super</span><span class="p">(</span><span class="n">Time</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">to_database</span><span class="p">(</span><span class="n">value</span><span class="p">)</span>
<span class="k">if</span> <span class="n">value</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">return</span>
<span class="c1"># str(util.Time) yields desired CQL encoding</span>
<span class="k">return</span> <span class="n">value</span> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">value</span><span class="p">,</span> <span class="n">util</span><span class="o">.</span><span class="n">Time</span><span class="p">)</span> <span class="k">else</span> <span class="n">util</span><span class="o">.</span><span class="n">Time</span><span class="p">(</span><span class="n">value</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">to_python</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
<span class="n">value</span> <span class="o">=</span> <span class="nb">super</span><span class="p">(</span><span class="n">Time</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">to_database</span><span class="p">(</span><span class="n">value</span><span class="p">)</span>
<span class="k">if</span> <span class="n">value</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">return</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">value</span><span class="p">,</span> <span class="n">util</span><span class="o">.</span><span class="n">Time</span><span class="p">):</span>
<span class="k">return</span> <span class="n">value</span>
<span class="k">return</span> <span class="n">util</span><span class="o">.</span><span class="n">Time</span><span class="p">(</span><span class="n">value</span><span class="p">)</span></div>
<span class="k">class</span> <span class="nc">Duration</span><span class="p">(</span><span class="n">Column</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Stores a duration (months, days, nanoseconds)</span>
<span class="sd"> .. versionadded:: 3.10.0</span>
<span class="sd"> requires C* 3.10+ and protocol v4+</span>
<span class="sd"> """</span>
<span class="n">db_type</span> <span class="o">=</span> <span class="s1">'duration'</span>
<span class="k">def</span> <span class="nf">validate</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
<span class="n">val</span> <span class="o">=</span> <span class="nb">super</span><span class="p">(</span><span class="n">Duration</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">validate</span><span class="p">(</span><span class="n">value</span><span class="p">)</span>
<span class="k">if</span> <span class="n">val</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">return</span>
<span class="k">if</span> <span class="ow">not</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">val</span><span class="p">,</span> <span class="n">_Duration</span><span class="p">):</span>
<span class="k">raise</span> <span class="ne">TypeError</span><span class="p">(</span><span class="s1">'</span><span class="si">{0}</span><span class="s1"> </span><span class="si">{1}</span><span class="s1"> is not a valid Duration.'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">column_name</span><span class="p">,</span> <span class="n">value</span><span class="p">))</span>
<span class="k">return</span> <span class="n">val</span>
<div class="viewcode-block" id="UUID"><a class="viewcode-back" href="../../../api/cassandra/cqlengine/columns.html#cassandra.cqlengine.columns.UUID">[docs]</a><span class="k">class</span> <span class="nc">UUID</span><span class="p">(</span><span class="n">Column</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Stores a type 1 or 4 UUID</span>
<span class="sd"> """</span>
<span class="n">db_type</span> <span class="o">=</span> <span class="s1">'uuid'</span>
<span class="k">def</span> <span class="nf">validate</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
<span class="n">val</span> <span class="o">=</span> <span class="nb">super</span><span class="p">(</span><span class="n">UUID</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">validate</span><span class="p">(</span><span class="n">value</span><span class="p">)</span>
<span class="k">if</span> <span class="n">val</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">return</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">val</span><span class="p">,</span> <span class="n">_UUID</span><span class="p">):</span>
<span class="k">return</span> <span class="n">val</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">val</span><span class="p">,</span> <span class="n">six</span><span class="o">.</span><span class="n">string_types</span><span class="p">):</span>
<span class="k">try</span><span class="p">:</span>
<span class="k">return</span> <span class="n">_UUID</span><span class="p">(</span><span class="n">val</span><span class="p">)</span>
<span class="k">except</span> <span class="ne">ValueError</span><span class="p">:</span>
<span class="c1"># fall-through to error</span>
<span class="k">pass</span>
<span class="k">raise</span> <span class="n">ValidationError</span><span class="p">(</span><span class="s2">"</span><span class="si">{0}</span><span class="s2"> </span><span class="si">{1}</span><span class="s2"> is not a valid uuid"</span><span class="o">.</span><span class="n">format</span><span class="p">(</span>
<span class="bp">self</span><span class="o">.</span><span class="n">column_name</span><span class="p">,</span> <span class="n">value</span><span class="p">))</span>
<span class="k">def</span> <span class="nf">to_python</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">validate</span><span class="p">(</span><span class="n">value</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">to_database</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">validate</span><span class="p">(</span><span class="n">value</span><span class="p">)</span></div>
<div class="viewcode-block" id="TimeUUID"><a class="viewcode-back" href="../../../api/cassandra/cqlengine/columns.html#cassandra.cqlengine.columns.TimeUUID">[docs]</a><span class="k">class</span> <span class="nc">TimeUUID</span><span class="p">(</span><span class="n">UUID</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> UUID containing timestamp</span>
<span class="sd"> """</span>
<span class="n">db_type</span> <span class="o">=</span> <span class="s1">'timeuuid'</span></div>
<div class="viewcode-block" id="Boolean"><a class="viewcode-back" href="../../../api/cassandra/cqlengine/columns.html#cassandra.cqlengine.columns.Boolean">[docs]</a><span class="k">class</span> <span class="nc">Boolean</span><span class="p">(</span><span class="n">Column</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Stores a boolean True or False value</span>
<span class="sd"> """</span>
<span class="n">db_type</span> <span class="o">=</span> <span class="s1">'boolean'</span>
<span class="k">def</span> <span class="nf">validate</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
<span class="sd">""" Always returns a Python boolean. """</span>
<span class="n">value</span> <span class="o">=</span> <span class="nb">super</span><span class="p">(</span><span class="n">Boolean</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">validate</span><span class="p">(</span><span class="n">value</span><span class="p">)</span>
<span class="k">if</span> <span class="n">value</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
<span class="n">value</span> <span class="o">=</span> <span class="nb">bool</span><span class="p">(</span><span class="n">value</span><span class="p">)</span>
<span class="k">return</span> <span class="n">value</span>
<span class="k">def</span> <span class="nf">to_python</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">validate</span><span class="p">(</span><span class="n">value</span><span class="p">)</span></div>
<span class="k">class</span> <span class="nc">BaseFloat</span><span class="p">(</span><span class="n">Column</span><span class="p">):</span>
<span class="k">def</span> <span class="nf">validate</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
<span class="n">value</span> <span class="o">=</span> <span class="nb">super</span><span class="p">(</span><span class="n">BaseFloat</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">validate</span><span class="p">(</span><span class="n">value</span><span class="p">)</span>
<span class="k">if</span> <span class="n">value</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">return</span>
<span class="k">try</span><span class="p">:</span>
<span class="k">return</span> <span class="nb">float</span><span class="p">(</span><span class="n">value</span><span class="p">)</span>
<span class="k">except</span> <span class="p">(</span><span class="ne">TypeError</span><span class="p">,</span> <span class="ne">ValueError</span><span class="p">):</span>
<span class="k">raise</span> <span class="n">ValidationError</span><span class="p">(</span><span class="s2">"</span><span class="si">{0}</span><span class="s2"> </span><span class="si">{1}</span><span class="s2"> is not a valid float"</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">column_name</span><span class="p">,</span> <span class="n">value</span><span class="p">))</span>
<span class="k">def</span> <span class="nf">to_python</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">validate</span><span class="p">(</span><span class="n">value</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">to_database</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">validate</span><span class="p">(</span><span class="n">value</span><span class="p">)</span>
<div class="viewcode-block" id="Float"><a class="viewcode-back" href="../../../api/cassandra/cqlengine/columns.html#cassandra.cqlengine.columns.Float">[docs]</a><span class="k">class</span> <span class="nc">Float</span><span class="p">(</span><span class="n">BaseFloat</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Stores a single-precision floating-point value</span>
<span class="sd"> """</span>
<span class="n">db_type</span> <span class="o">=</span> <span class="s1">'float'</span></div>
<div class="viewcode-block" id="Double"><a class="viewcode-back" href="../../../api/cassandra/cqlengine/columns.html#cassandra.cqlengine.columns.Double">[docs]</a><span class="k">class</span> <span class="nc">Double</span><span class="p">(</span><span class="n">BaseFloat</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Stores a double-precision floating-point value</span>
<span class="sd"> """</span>
<span class="n">db_type</span> <span class="o">=</span> <span class="s1">'double'</span></div>
<div class="viewcode-block" id="Decimal"><a class="viewcode-back" href="../../../api/cassandra/cqlengine/columns.html#cassandra.cqlengine.columns.Decimal">[docs]</a><span class="k">class</span> <span class="nc">Decimal</span><span class="p">(</span><span class="n">Column</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Stores a variable precision decimal value</span>
<span class="sd"> """</span>
<span class="n">db_type</span> <span class="o">=</span> <span class="s1">'decimal'</span>
<span class="k">def</span> <span class="nf">validate</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
<span class="kn">from</span> <span class="nn">decimal</span> <span class="k">import</span> <span class="n">Decimal</span> <span class="k">as</span> <span class="n">_Decimal</span>
<span class="kn">from</span> <span class="nn">decimal</span> <span class="k">import</span> <span class="n">InvalidOperation</span>
<span class="n">val</span> <span class="o">=</span> <span class="nb">super</span><span class="p">(</span><span class="n">Decimal</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">validate</span><span class="p">(</span><span class="n">value</span><span class="p">)</span>
<span class="k">if</span> <span class="n">val</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">return</span>
<span class="k">try</span><span class="p">:</span>
<span class="k">return</span> <span class="n">_Decimal</span><span class="p">(</span><span class="nb">repr</span><span class="p">(</span><span class="n">val</span><span class="p">))</span> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">val</span><span class="p">,</span> <span class="nb">float</span><span class="p">)</span> <span class="k">else</span> <span class="n">_Decimal</span><span class="p">(</span><span class="n">val</span><span class="p">)</span>
<span class="k">except</span> <span class="n">InvalidOperation</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">ValidationError</span><span class="p">(</span><span class="s2">"</span><span class="si">{0}</span><span class="s2"> '</span><span class="si">{1}</span><span class="s2">' can't be coerced to decimal"</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">column_name</span><span class="p">,</span> <span class="n">val</span><span class="p">))</span>
<span class="k">def</span> <span class="nf">to_python</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">validate</span><span class="p">(</span><span class="n">value</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">to_database</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">validate</span><span class="p">(</span><span class="n">value</span><span class="p">)</span></div>
<span class="k">class</span> <span class="nc">BaseCollectionColumn</span><span class="p">(</span><span class="n">Column</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Base Container type for collection-like columns.</span>
<span class="sd"> http://cassandra.apache.org/doc/cql3/CQL-3.0.html#collections</span>
<span class="sd"> """</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">types</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> :param types: a sequence of sub types in this collection</span>
<span class="sd"> """</span>
<span class="n">instances</span> <span class="o">=</span> <span class="p">[]</span>
<span class="k">for</span> <span class="n">t</span> <span class="ow">in</span> <span class="n">types</span><span class="p">:</span>
<span class="n">inheritance_comparator</span> <span class="o">=</span> <span class="nb">issubclass</span> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">t</span><span class="p">,</span> <span class="nb">type</span><span class="p">)</span> <span class="k">else</span> <span class="nb">isinstance</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">inheritance_comparator</span><span class="p">(</span><span class="n">t</span><span class="p">,</span> <span class="n">Column</span><span class="p">):</span>
<span class="k">raise</span> <span class="n">ValidationError</span><span class="p">(</span><span class="s2">"</span><span class="si">%s</span><span class="s2"> is not a column class"</span> <span class="o">%</span> <span class="p">(</span><span class="n">t</span><span class="p">,))</span>
<span class="k">if</span> <span class="n">t</span><span class="o">.</span><span class="n">db_type</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">ValidationError</span><span class="p">(</span><span class="s2">"</span><span class="si">%s</span><span class="s2"> is an abstract type"</span> <span class="o">%</span> <span class="p">(</span><span class="n">t</span><span class="p">,))</span>
<span class="n">inst</span> <span class="o">=</span> <span class="n">t</span><span class="p">()</span> <span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">t</span><span class="p">,</span> <span class="nb">type</span><span class="p">)</span> <span class="k">else</span> <span class="n">t</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">t</span><span class="p">,</span> <span class="n">BaseCollectionColumn</span><span class="p">):</span>
<span class="n">inst</span><span class="o">.</span><span class="n">_freeze_db_type</span><span class="p">()</span>
<span class="n">instances</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">inst</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">types</span> <span class="o">=</span> <span class="n">instances</span>
<span class="nb">super</span><span class="p">(</span><span class="n">BaseCollectionColumn</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span><span class="o">**</span><span class="n">kwargs</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">validate</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
<span class="n">value</span> <span class="o">=</span> <span class="nb">super</span><span class="p">(</span><span class="n">BaseCollectionColumn</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">validate</span><span class="p">(</span><span class="n">value</span><span class="p">)</span>
<span class="c1"># It is dangerous to let collections have more than 65535.</span>
<span class="c1"># See: https://issues.apache.org/jira/browse/CASSANDRA-5428</span>
<span class="k">if</span> <span class="n">value</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span> <span class="ow">and</span> <span class="nb">len</span><span class="p">(</span><span class="n">value</span><span class="p">)</span> <span class="o">></span> <span class="mi">65535</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">ValidationError</span><span class="p">(</span><span class="s2">"</span><span class="si">{0}</span><span class="s2"> Collection can't have more than 65535 elements."</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">column_name</span><span class="p">))</span>
<span class="k">return</span> <span class="n">value</span>
<span class="k">def</span> <span class="nf">_val_is_null</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">val</span><span class="p">):</span>
<span class="k">return</span> <span class="ow">not</span> <span class="n">val</span>
<span class="k">def</span> <span class="nf">_freeze_db_type</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">if</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">db_type</span><span class="o">.</span><span class="n">startswith</span><span class="p">(</span><span class="s1">'frozen'</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">db_type</span> <span class="o">=</span> <span class="s2">"frozen<</span><span class="si">%s</span><span class="s2">>"</span> <span class="o">%</span> <span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">db_type</span><span class="p">,)</span>
<span class="nd">@property</span>
<span class="k">def</span> <span class="nf">sub_types</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">types</span>
<span class="nd">@property</span>
<span class="k">def</span> <span class="nf">cql_type</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="n">_cqltypes</span><span class="p">[</span><span class="bp">self</span><span class="o">.</span><span class="vm">__class__</span><span class="o">.</span><span class="vm">__name__</span><span class="o">.</span><span class="n">lower</span><span class="p">()]</span><span class="o">.</span><span class="n">apply_parameters</span><span class="p">([</span><span class="n">c</span><span class="o">.</span><span class="n">cql_type</span> <span class="k">for</span> <span class="n">c</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">types</span><span class="p">])</span>
<span class="k">class</span> <span class="nc">Tuple</span><span class="p">(</span><span class="n">BaseCollectionColumn</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Stores a fixed-length set of positional values</span>
<span class="sd"> http://docs.datastax.com/en/cql/3.1/cql/cql_reference/tupleType.html</span>
<span class="sd"> """</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> :param args: column types representing tuple composition</span>
<span class="sd"> """</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">args</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span><span class="s2">"Tuple must specify at least one inner type"</span><span class="p">)</span>
<span class="nb">super</span><span class="p">(</span><span class="n">Tuple</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="fm">__init__</span><span class="p">(</span><span class="n">args</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">db_type</span> <span class="o">=</span> <span class="s1">'tuple<</span><span class="si">{0}</span><span class="s1">>'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="s1">', '</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">typ</span><span class="o">.</span><span class="n">db_type</span> <span class="k">for</span> <span class="n">typ</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">types</span><span class="p">))</span>
<span class="k">def</span> <span class="nf">validate</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
<span class="n">val</span> <span class="o">=</span> <span class="nb">super</span><span class="p">(</span><span class="n">Tuple</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">validate</span><span class="p">(</span><span class="n">value</span><span class="p">)</span>
<span class="k">if</span> <span class="n">val</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">return</span>
<span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">val</span><span class="p">)</span> <span class="o">></span> <span class="nb">len</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">types</span><span class="p">):</span>
<span class="k">raise</span> <span class="n">ValidationError</span><span class="p">(</span><span class="s2">"Value </span><span class="si">%r</span><span class="s2"> has more fields than tuple definition (</span><span class="si">%s</span><span class="s2">)"</span> <span class="o">%</span>
<span class="p">(</span><span class="n">val</span><span class="p">,</span> <span class="s1">', '</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">t</span> <span class="k">for</span> <span class="n">t</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">types</span><span class="p">)))</span>
<span class="k">return</span> <span class="nb">tuple</span><span class="p">(</span><span class="n">t</span><span class="o">.</span><span class="n">validate</span><span class="p">(</span><span class="n">v</span><span class="p">)</span> <span class="k">for</span> <span class="n">t</span><span class="p">,</span> <span class="n">v</span> <span class="ow">in</span> <span class="nb">zip</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">types</span><span class="p">,</span> <span class="n">val</span><span class="p">))</span>
<span class="k">def</span> <span class="nf">to_python</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
<span class="k">if</span> <span class="n">value</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">return</span> <span class="nb">tuple</span><span class="p">()</span>
<span class="k">return</span> <span class="nb">tuple</span><span class="p">(</span><span class="n">t</span><span class="o">.</span><span class="n">to_python</span><span class="p">(</span><span class="n">v</span><span class="p">)</span> <span class="k">for</span> <span class="n">t</span><span class="p">,</span> <span class="n">v</span> <span class="ow">in</span> <span class="nb">zip</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">types</span><span class="p">,</span> <span class="n">value</span><span class="p">))</span>
<span class="k">def</span> <span class="nf">to_database</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
<span class="k">if</span> <span class="n">value</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">return</span>
<span class="k">return</span> <span class="nb">tuple</span><span class="p">(</span><span class="n">t</span><span class="o">.</span><span class="n">to_database</span><span class="p">(</span><span class="n">v</span><span class="p">)</span> <span class="k">for</span> <span class="n">t</span><span class="p">,</span> <span class="n">v</span> <span class="ow">in</span> <span class="nb">zip</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">types</span><span class="p">,</span> <span class="n">value</span><span class="p">))</span>
<span class="k">class</span> <span class="nc">BaseContainerColumn</span><span class="p">(</span><span class="n">BaseCollectionColumn</span><span class="p">):</span>
<span class="k">pass</span>
<div class="viewcode-block" id="Set"><a class="viewcode-back" href="../../../api/cassandra/cqlengine/columns.html#cassandra.cqlengine.columns.Set">[docs]</a><span class="k">class</span> <span class="nc">Set</span><span class="p">(</span><span class="n">BaseContainerColumn</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Stores a set of unordered, unique values</span>
<span class="sd"> http://www.datastax.com/documentation/cql/3.1/cql/cql_using/use_set_t.html</span>
<span class="sd"> """</span>
<span class="n">_python_type_hashable</span> <span class="o">=</span> <span class="kc">False</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value_type</span><span class="p">,</span> <span class="n">strict</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span> <span class="n">default</span><span class="o">=</span><span class="nb">set</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> :param value_type: a column class indicating the types of the value</span>
<span class="sd"> :param strict: sets whether non set values will be coerced to set</span>
<span class="sd"> type on validation, or raise a validation error, defaults to True</span>
<span class="sd"> """</span>
<span class="bp">self</span><span class="o">.</span><span class="n">strict</span> <span class="o">=</span> <span class="n">strict</span>
<span class="nb">super</span><span class="p">(</span><span class="n">Set</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="fm">__init__</span><span class="p">((</span><span class="n">value_type</span><span class="p">,),</span> <span class="n">default</span><span class="o">=</span><span class="n">default</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">value_col</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">types</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span>
<span class="k">if</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">value_col</span><span class="o">.</span><span class="n">_python_type_hashable</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">ValidationError</span><span class="p">(</span><span class="s2">"Cannot create a Set with unhashable value type (see PYTHON-494)"</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">db_type</span> <span class="o">=</span> <span class="s1">'set<</span><span class="si">{0}</span><span class="s1">>'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">value_col</span><span class="o">.</span><span class="n">db_type</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">validate</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
<span class="n">val</span> <span class="o">=</span> <span class="nb">super</span><span class="p">(</span><span class="n">Set</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">validate</span><span class="p">(</span><span class="n">value</span><span class="p">)</span>
<span class="k">if</span> <span class="n">val</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">return</span>
<span class="n">types</span> <span class="o">=</span> <span class="p">(</span><span class="nb">set</span><span class="p">,</span> <span class="n">util</span><span class="o">.</span><span class="n">SortedSet</span><span class="p">)</span> <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">strict</span> <span class="k">else</span> <span class="p">(</span><span class="nb">set</span><span class="p">,</span> <span class="n">util</span><span class="o">.</span><span class="n">SortedSet</span><span class="p">,</span> <span class="nb">list</span><span class="p">,</span> <span class="nb">tuple</span><span class="p">)</span>
<span class="k">if</span> <span class="ow">not</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">val</span><span class="p">,</span> <span class="n">types</span><span class="p">):</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">strict</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">ValidationError</span><span class="p">(</span><span class="s1">'</span><span class="si">{0}</span><span class="s1"> </span><span class="si">{1}</span><span class="s1"> is not a set object'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">column_name</span><span class="p">,</span> <span class="n">val</span><span class="p">))</span>
<span class="k">else</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">ValidationError</span><span class="p">(</span><span class="s1">'</span><span class="si">{0}</span><span class="s1"> </span><span class="si">{1}</span><span class="s1"> cannot be coerced to a set object'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">column_name</span><span class="p">,</span> <span class="n">val</span><span class="p">))</span>
<span class="k">if</span> <span class="kc">None</span> <span class="ow">in</span> <span class="n">val</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">ValidationError</span><span class="p">(</span><span class="s2">"</span><span class="si">{0}</span><span class="s2"> None not allowed in a set"</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">column_name</span><span class="p">))</span>
<span class="c1"># TODO: stop doing this conversion because it doesn't support non-hashable collections as keys (cassandra does)</span>
<span class="c1"># will need to start using the cassandra.util types in the next major rev (PYTHON-494)</span>
<span class="k">return</span> <span class="nb">set</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">value_col</span><span class="o">.</span><span class="n">validate</span><span class="p">(</span><span class="n">v</span><span class="p">)</span> <span class="k">for</span> <span class="n">v</span> <span class="ow">in</span> <span class="n">val</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">to_python</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
<span class="k">if</span> <span class="n">value</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">return</span> <span class="nb">set</span><span class="p">()</span>
<span class="k">return</span> <span class="nb">set</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">value_col</span><span class="o">.</span><span class="n">to_python</span><span class="p">(</span><span class="n">v</span><span class="p">)</span> <span class="k">for</span> <span class="n">v</span> <span class="ow">in</span> <span class="n">value</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">to_database</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
<span class="k">if</span> <span class="n">value</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">return</span> <span class="kc">None</span>
<span class="k">return</span> <span class="nb">set</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">value_col</span><span class="o">.</span><span class="n">to_database</span><span class="p">(</span><span class="n">v</span><span class="p">)</span> <span class="k">for</span> <span class="n">v</span> <span class="ow">in</span> <span class="n">value</span><span class="p">)</span></div>
<div class="viewcode-block" id="List"><a class="viewcode-back" href="../../../api/cassandra/cqlengine/columns.html#cassandra.cqlengine.columns.List">[docs]</a><span class="k">class</span> <span class="nc">List</span><span class="p">(</span><span class="n">BaseContainerColumn</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Stores a list of ordered values</span>
<span class="sd"> http://www.datastax.com/documentation/cql/3.1/cql/cql_using/use_list_t.html</span>
<span class="sd"> """</span>
<span class="n">_python_type_hashable</span> <span class="o">=</span> <span class="kc">False</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value_type</span><span class="p">,</span> <span class="n">default</span><span class="o">=</span><span class="nb">list</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> :param value_type: a column class indicating the types of the value</span>
<span class="sd"> """</span>
<span class="nb">super</span><span class="p">(</span><span class="n">List</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="fm">__init__</span><span class="p">((</span><span class="n">value_type</span><span class="p">,),</span> <span class="n">default</span><span class="o">=</span><span class="n">default</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">value_col</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">types</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span>
<span class="bp">self</span><span class="o">.</span><span class="n">db_type</span> <span class="o">=</span> <span class="s1">'list<</span><span class="si">{0}</span><span class="s1">>'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">value_col</span><span class="o">.</span><span class="n">db_type</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">validate</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
<span class="n">val</span> <span class="o">=</span> <span class="nb">super</span><span class="p">(</span><span class="n">List</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">validate</span><span class="p">(</span><span class="n">value</span><span class="p">)</span>
<span class="k">if</span> <span class="n">val</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">return</span>
<span class="k">if</span> <span class="ow">not</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">val</span><span class="p">,</span> <span class="p">(</span><span class="nb">set</span><span class="p">,</span> <span class="nb">list</span><span class="p">,</span> <span class="nb">tuple</span><span class="p">)):</span>
<span class="k">raise</span> <span class="n">ValidationError</span><span class="p">(</span><span class="s1">'</span><span class="si">{0}</span><span class="s1"> </span><span class="si">{1}</span><span class="s1"> is not a list object'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">column_name</span><span class="p">,</span> <span class="n">val</span><span class="p">))</span>
<span class="k">if</span> <span class="kc">None</span> <span class="ow">in</span> <span class="n">val</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">ValidationError</span><span class="p">(</span><span class="s2">"</span><span class="si">{0}</span><span class="s2"> None is not allowed in a list"</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">column_name</span><span class="p">))</span>
<span class="k">return</span> <span class="p">[</span><span class="bp">self</span><span class="o">.</span><span class="n">value_col</span><span class="o">.</span><span class="n">validate</span><span class="p">(</span><span class="n">v</span><span class="p">)</span> <span class="k">for</span> <span class="n">v</span> <span class="ow">in</span> <span class="n">val</span><span class="p">]</span>
<span class="k">def</span> <span class="nf">to_python</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
<span class="k">if</span> <span class="n">value</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">return</span> <span class="p">[]</span>
<span class="k">return</span> <span class="p">[</span><span class="bp">self</span><span class="o">.</span><span class="n">value_col</span><span class="o">.</span><span class="n">to_python</span><span class="p">(</span><span class="n">v</span><span class="p">)</span> <span class="k">for</span> <span class="n">v</span> <span class="ow">in</span> <span class="n">value</span><span class="p">]</span>
<span class="k">def</span> <span class="nf">to_database</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
<span class="k">if</span> <span class="n">value</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">return</span> <span class="kc">None</span>
<span class="k">return</span> <span class="p">[</span><span class="bp">self</span><span class="o">.</span><span class="n">value_col</span><span class="o">.</span><span class="n">to_database</span><span class="p">(</span><span class="n">v</span><span class="p">)</span> <span class="k">for</span> <span class="n">v</span> <span class="ow">in</span> <span class="n">value</span><span class="p">]</span></div>
<div class="viewcode-block" id="Map"><a class="viewcode-back" href="../../../api/cassandra/cqlengine/columns.html#cassandra.cqlengine.columns.Map">[docs]</a><span class="k">class</span> <span class="nc">Map</span><span class="p">(</span><span class="n">BaseContainerColumn</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Stores a key -> value map (dictionary)</span>
<span class="sd"> http://www.datastax.com/documentation/cql/3.1/cql/cql_using/use_map_t.html</span>
<span class="sd"> """</span>
<span class="n">_python_type_hashable</span> <span class="o">=</span> <span class="kc">False</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">key_type</span><span class="p">,</span> <span class="n">value_type</span><span class="p">,</span> <span class="n">default</span><span class="o">=</span><span class="nb">dict</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> :param key_type: a column class indicating the types of the key</span>
<span class="sd"> :param value_type: a column class indicating the types of the value</span>
<span class="sd"> """</span>
<span class="nb">super</span><span class="p">(</span><span class="n">Map</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="fm">__init__</span><span class="p">((</span><span class="n">key_type</span><span class="p">,</span> <span class="n">value_type</span><span class="p">),</span> <span class="n">default</span><span class="o">=</span><span class="n">default</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">key_col</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">types</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span>
<span class="bp">self</span><span class="o">.</span><span class="n">value_col</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">types</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span>
<span class="k">if</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">key_col</span><span class="o">.</span><span class="n">_python_type_hashable</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">ValidationError</span><span class="p">(</span><span class="s2">"Cannot create a Map with unhashable key type (see PYTHON-494)"</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">db_type</span> <span class="o">=</span> <span class="s1">'map<</span><span class="si">{0}</span><span class="s1">, </span><span class="si">{1}</span><span class="s1">>'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">key_col</span><span class="o">.</span><span class="n">db_type</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">value_col</span><span class="o">.</span><span class="n">db_type</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">validate</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
<span class="n">val</span> <span class="o">=</span> <span class="nb">super</span><span class="p">(</span><span class="n">Map</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">validate</span><span class="p">(</span><span class="n">value</span><span class="p">)</span>
<span class="k">if</span> <span class="n">val</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">return</span>
<span class="k">if</span> <span class="ow">not</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">val</span><span class="p">,</span> <span class="p">(</span><span class="nb">dict</span><span class="p">,</span> <span class="n">util</span><span class="o">.</span><span class="n">OrderedMap</span><span class="p">)):</span>
<span class="k">raise</span> <span class="n">ValidationError</span><span class="p">(</span><span class="s1">'</span><span class="si">{0}</span><span class="s1"> </span><span class="si">{1}</span><span class="s1"> is not a dict object'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">column_name</span><span class="p">,</span> <span class="n">val</span><span class="p">))</span>
<span class="k">if</span> <span class="kc">None</span> <span class="ow">in</span> <span class="n">val</span><span class="p">:</span>
<span class="k">raise</span> <span class="n">ValidationError</span><span class="p">(</span><span class="s2">"</span><span class="si">{0}</span><span class="s2"> None is not allowed in a map"</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">column_name</span><span class="p">))</span>
<span class="c1"># TODO: stop doing this conversion because it doesn't support non-hashable collections as keys (cassandra does)</span>
<span class="c1"># will need to start using the cassandra.util types in the next major rev (PYTHON-494)</span>
<span class="k">return</span> <span class="nb">dict</span><span class="p">((</span><span class="bp">self</span><span class="o">.</span><span class="n">key_col</span><span class="o">.</span><span class="n">validate</span><span class="p">(</span><span class="n">k</span><span class="p">),</span> <span class="bp">self</span><span class="o">.</span><span class="n">value_col</span><span class="o">.</span><span class="n">validate</span><span class="p">(</span><span class="n">v</span><span class="p">))</span> <span class="k">for</span> <span class="n">k</span><span class="p">,</span> <span class="n">v</span> <span class="ow">in</span> <span class="n">val</span><span class="o">.</span><span class="n">items</span><span class="p">())</span>
<span class="k">def</span> <span class="nf">to_python</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
<span class="k">if</span> <span class="n">value</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">return</span> <span class="p">{}</span>
<span class="k">if</span> <span class="n">value</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
<span class="k">return</span> <span class="nb">dict</span><span class="p">((</span><span class="bp">self</span><span class="o">.</span><span class="n">key_col</span><span class="o">.</span><span class="n">to_python</span><span class="p">(</span><span class="n">k</span><span class="p">),</span> <span class="bp">self</span><span class="o">.</span><span class="n">value_col</span><span class="o">.</span><span class="n">to_python</span><span class="p">(</span><span class="n">v</span><span class="p">))</span> <span class="k">for</span> <span class="n">k</span><span class="p">,</span> <span class="n">v</span> <span class="ow">in</span> <span class="n">value</span><span class="o">.</span><span class="n">items</span><span class="p">())</span>