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evennia/docs/1.0-dev/_modules/django/utils/deconstruct.html
Griatch b7ed24bf51 Updated HTML docs
2020-11-14 13:44:49 +01:00

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<h1>Source code for django.utils.deconstruct</h1><div class="highlight"><pre>
<span></span><span class="kn">from</span> <span class="nn">importlib</span> <span class="k">import</span> <span class="n">import_module</span>
<span class="kn">from</span> <span class="nn">django.utils.version</span> <span class="k">import</span> <span class="n">get_docs_version</span>
<span class="k">def</span> <span class="nf">deconstructible</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">,</span> <span class="n">path</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Class decorator that allows the decorated class to be serialized</span>
<span class="sd"> by the migrations subsystem.</span>
<span class="sd"> The `path` kwarg specifies the import path.</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="k">def</span> <span class="nf">decorator</span><span class="p">(</span><span class="n">klass</span><span class="p">):</span>
<span class="k">def</span> <span class="nf">__new__</span><span class="p">(</span><span class="bp">cls</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="c1"># We capture the arguments to make returning them trivial</span>
<span class="n">obj</span> <span class="o">=</span> <span class="nb">super</span><span class="p">(</span><span class="n">klass</span><span class="p">,</span> <span class="bp">cls</span><span class="p">)</span><span class="o">.</span><span class="fm">__new__</span><span class="p">(</span><span class="bp">cls</span><span class="p">)</span>
<span class="n">obj</span><span class="o">.</span><span class="n">_constructor_args</span> <span class="o">=</span> <span class="p">(</span><span class="n">args</span><span class="p">,</span> <span class="n">kwargs</span><span class="p">)</span>
<span class="k">return</span> <span class="n">obj</span>
<span class="k">def</span> <span class="nf">deconstruct</span><span class="p">(</span><span class="n">obj</span><span class="p">):</span>
<span class="sd">&quot;&quot;&quot;</span>
<span class="sd"> Return a 3-tuple of class import path, positional arguments,</span>
<span class="sd"> and keyword arguments.</span>
<span class="sd"> &quot;&quot;&quot;</span>
<span class="c1"># Fallback version</span>
<span class="k">if</span> <span class="n">path</span><span class="p">:</span>
<span class="n">module_name</span><span class="p">,</span> <span class="n">_</span><span class="p">,</span> <span class="n">name</span> <span class="o">=</span> <span class="n">path</span><span class="o">.</span><span class="n">rpartition</span><span class="p">(</span><span class="s1">&#39;.&#39;</span><span class="p">)</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">module_name</span> <span class="o">=</span> <span class="n">obj</span><span class="o">.</span><span class="vm">__module__</span>
<span class="n">name</span> <span class="o">=</span> <span class="n">obj</span><span class="o">.</span><span class="vm">__class__</span><span class="o">.</span><span class="vm">__name__</span>
<span class="c1"># Make sure it&#39;s actually there and not an inner class</span>
<span class="n">module</span> <span class="o">=</span> <span class="n">import_module</span><span class="p">(</span><span class="n">module_name</span><span class="p">)</span>
<span class="k">if</span> <span class="ow">not</span> <span class="nb">hasattr</span><span class="p">(</span><span class="n">module</span><span class="p">,</span> <span class="n">name</span><span class="p">):</span>
<span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span>
<span class="s2">&quot;Could not find object </span><span class="si">%s</span><span class="s2"> in </span><span class="si">%s</span><span class="s2">.</span><span class="se">\n</span><span class="s2">&quot;</span>
<span class="s2">&quot;Please note that you cannot serialize things like inner &quot;</span>
<span class="s2">&quot;classes. Please move the object into the main module &quot;</span>
<span class="s2">&quot;body to use migrations.</span><span class="se">\n</span><span class="s2">&quot;</span>
<span class="s2">&quot;For more information, see &quot;</span>
<span class="s2">&quot;https://docs.djangoproject.com/en/</span><span class="si">%s</span><span class="s2">/topics/migrations/#serializing-values&quot;</span>
<span class="o">%</span> <span class="p">(</span><span class="n">name</span><span class="p">,</span> <span class="n">module_name</span><span class="p">,</span> <span class="n">get_docs_version</span><span class="p">()))</span>
<span class="k">return</span> <span class="p">(</span>
<span class="n">path</span> <span class="ow">or</span> <span class="s1">&#39;</span><span class="si">%s</span><span class="s1">.</span><span class="si">%s</span><span class="s1">&#39;</span> <span class="o">%</span> <span class="p">(</span><span class="n">obj</span><span class="o">.</span><span class="vm">__class__</span><span class="o">.</span><span class="vm">__module__</span><span class="p">,</span> <span class="n">name</span><span class="p">),</span>
<span class="n">obj</span><span class="o">.</span><span class="n">_constructor_args</span><span class="p">[</span><span class="mi">0</span><span class="p">],</span>
<span class="n">obj</span><span class="o">.</span><span class="n">_constructor_args</span><span class="p">[</span><span class="mi">1</span><span class="p">],</span>
<span class="p">)</span>
<span class="n">klass</span><span class="o">.</span><span class="fm">__new__</span> <span class="o">=</span> <span class="nb">staticmethod</span><span class="p">(</span><span class="fm">__new__</span><span class="p">)</span>
<span class="n">klass</span><span class="o">.</span><span class="n">deconstruct</span> <span class="o">=</span> <span class="n">deconstruct</span>
<span class="k">return</span> <span class="n">klass</span>
<span class="k">if</span> <span class="ow">not</span> <span class="n">args</span><span class="p">:</span>
<span class="k">return</span> <span class="n">decorator</span>
<span class="k">return</span> <span class="n">decorator</span><span class="p">(</span><span class="o">*</span><span class="n">args</span><span class="p">)</span>
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