<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" lang=""> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>django.apps.config — Django 1.8.19 documentation</title> <link rel="stylesheet" href="../../../_static/default.css" type="text/css" /> <link rel="stylesheet" href="../../../_static/pygments.css" type="text/css" /> <script type="text/javascript"> var DOCUMENTATION_OPTIONS = { URL_ROOT: '../../../', VERSION: '1.8.19', COLLAPSE_INDEX: false, FILE_SUFFIX: '.html', HAS_SOURCE: true }; </script> <script type="text/javascript" src="../../../_static/jquery.js"></script> <script type="text/javascript" src="../../../_static/underscore.js"></script> <script type="text/javascript" src="../../../_static/doctools.js"></script> <link rel="index" title="Index" href="../../../genindex.html" /> <link rel="search" title="Search" href="../../../search.html" /> <link rel="top" title="Django 1.8.19 documentation" href="../../../contents.html" /> <link rel="up" title="django" href="../../django.html" /> <script type="text/javascript" src="../../../templatebuiltins.js"></script> <script type="text/javascript"> (function($) { if (!django_template_builtins) { // templatebuiltins.js missing, do nothing. return; } $(document).ready(function() { // Hyperlink Django template tags and filters var base = "../../../ref/templates/builtins.html"; if (base == "#") { // Special case for builtins.html itself base = ""; } // Tags are keywords, class '.k' $("div.highlight\\-html\\+django span.k").each(function(i, elem) { var tagname = $(elem).text(); if ($.inArray(tagname, django_template_builtins.ttags) != -1) { var fragment = tagname.replace(/_/, '-'); $(elem).html("<a href='" + base + "#" + fragment + "'>" + tagname + "</a>"); } }); // Filters are functions, class '.nf' $("div.highlight\\-html\\+django span.nf").each(function(i, elem) { var filtername = $(elem).text(); if ($.inArray(filtername, django_template_builtins.tfilters) != -1) { var fragment = filtername.replace(/_/, '-'); $(elem).html("<a href='" + base + "#" + fragment + "'>" + filtername + "</a>"); } }); }); })(jQuery); </script> </head> <body role="document"> <div class="document"> <div id="custom-doc" class="yui-t6"> <div id="hd"> <h1><a href="../../../index.html">Django 1.8.19 documentation</a></h1> <div id="global-nav"> <a title="Home page" href="../../../index.html">Home</a> | <a title="Table of contents" href="../../../contents.html">Table of contents</a> | <a title="Global index" href="../../../genindex.html">Index</a> | <a title="Module index" href="../../../py-modindex.html">Modules</a> </div> <div class="nav"> <a href="../../index.html" title="Module code" accesskey="U">up</a></div> </div> <div id="bd"> <div id="yui-main"> <div class="yui-b"> <div class="yui-g" id="_modules-django-apps-config"> <h1>Source code for django.apps.config</h1><div class="highlight"><pre> <span></span><span class="kn">import</span> <span class="nn">os</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.core.exceptions</span> <span class="k">import</span> <span class="n">AppRegistryNotReady</span><span class="p">,</span> <span class="n">ImproperlyConfigured</span> <span class="kn">from</span> <span class="nn">django.utils._os</span> <span class="k">import</span> <span class="n">upath</span> <span class="kn">from</span> <span class="nn">django.utils.module_loading</span> <span class="k">import</span> <span class="n">module_has_submodule</span> <span class="n">MODELS_MODULE_NAME</span> <span class="o">=</span> <span class="s1">'models'</span> <div class="viewcode-block" id="AppConfig"><a class="viewcode-back" href="../../../ref/applications.html#django.apps.AppConfig">[docs]</a><span class="k">class</span> <span class="nc">AppConfig</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span> <span class="sd">"""</span> <span class="sd"> Class representing a Django application and its configuration.</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">app_name</span><span class="p">,</span> <span class="n">app_module</span><span class="p">):</span> <span class="c1"># Full Python path to the application eg. 'django.contrib.admin'.</span> <span class="bp">self</span><span class="o">.</span><span class="n">name</span> <span class="o">=</span> <span class="n">app_name</span> <span class="c1"># Root module for the application eg. <module 'django.contrib.admin'</span> <span class="c1"># from 'django/contrib/admin/__init__.pyc'>.</span> <span class="bp">self</span><span class="o">.</span><span class="n">module</span> <span class="o">=</span> <span class="n">app_module</span> <span class="c1"># The following attributes could be defined at the class level in a</span> <span class="c1"># subclass, hence the test-and-set pattern.</span> <span class="c1"># Last component of the Python path to the application eg. 'admin'.</span> <span class="c1"># This value must be unique across a Django project.</span> <span class="k">if</span> <span class="ow">not</span> <span class="nb">hasattr</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="s1">'label'</span><span class="p">):</span> <span class="bp">self</span><span class="o">.</span><span class="n">label</span> <span class="o">=</span> <span class="n">app_name</span><span class="o">.</span><span class="n">rpartition</span><span class="p">(</span><span class="s2">"."</span><span class="p">)[</span><span class="mi">2</span><span class="p">]</span> <span class="c1"># Human-readable name for the application eg. "Admin".</span> <span class="k">if</span> <span class="ow">not</span> <span class="nb">hasattr</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="s1">'verbose_name'</span><span class="p">):</span> <span class="bp">self</span><span class="o">.</span><span class="n">verbose_name</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">label</span><span class="o">.</span><span class="n">title</span><span class="p">()</span> <span class="c1"># Filesystem path to the application directory eg.</span> <span class="c1"># u'/usr/lib/python2.7/dist-packages/django/contrib/admin'. Unicode on</span> <span class="c1"># Python 2 and a str on Python 3.</span> <span class="k">if</span> <span class="ow">not</span> <span class="nb">hasattr</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="s1">'path'</span><span class="p">):</span> <span class="bp">self</span><span class="o">.</span><span class="n">path</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_path_from_module</span><span class="p">(</span><span class="n">app_module</span><span class="p">)</span> <span class="c1"># Module containing models eg. <module 'django.contrib.admin.models'</span> <span class="c1"># from 'django/contrib/admin/models.pyc'>. Set by import_models().</span> <span class="c1"># None if the application doesn't have a models module.</span> <span class="bp">self</span><span class="o">.</span><span class="n">models_module</span> <span class="o">=</span> <span class="kc">None</span> <span class="c1"># Mapping of lower case model names to model classes. Initially set to</span> <span class="c1"># None to prevent accidental access before import_models() runs.</span> <span class="bp">self</span><span class="o">.</span><span class="n">models</span> <span class="o">=</span> <span class="kc">None</span> <span class="k">def</span> <span class="nf">__repr__</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">%s</span><span class="s1">: </span><span class="si">%s</span><span class="s1">>'</span> <span class="o">%</span> <span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">__class__</span><span class="o">.</span><span class="n">__name__</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">label</span><span class="p">)</span> <span class="k">def</span> <span class="nf">_path_from_module</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">module</span><span class="p">):</span> <span class="sd">"""Attempt to determine app's filesystem path from its module."""</span> <span class="c1"># See #21874 for extended discussion of the behavior of this method in</span> <span class="c1"># various cases.</span> <span class="c1"># Convert paths to list because Python 3.3 _NamespacePath does not</span> <span class="c1"># support indexing.</span> <span class="n">paths</span> <span class="o">=</span> <span class="nb">list</span><span class="p">(</span><span class="nb">getattr</span><span class="p">(</span><span class="n">module</span><span class="p">,</span> <span class="s1">'__path__'</span><span class="p">,</span> <span class="p">[]))</span> <span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">paths</span><span class="p">)</span> <span class="o">!=</span> <span class="mi">1</span><span class="p">:</span> <span class="n">filename</span> <span class="o">=</span> <span class="nb">getattr</span><span class="p">(</span><span class="n">module</span><span class="p">,</span> <span class="s1">'__file__'</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span> <span class="k">if</span> <span class="n">filename</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span> <span class="n">paths</span> <span class="o">=</span> <span class="p">[</span><span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">dirname</span><span class="p">(</span><span class="n">filename</span><span class="p">)]</span> <span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">paths</span><span class="p">)</span> <span class="o">></span> <span class="mi">1</span><span class="p">:</span> <span class="k">raise</span> <span class="n">ImproperlyConfigured</span><span class="p">(</span> <span class="s2">"The app module </span><span class="si">%r</span><span class="s2"> has multiple filesystem locations (</span><span class="si">%r</span><span class="s2">); "</span> <span class="s2">"you must configure this app with an AppConfig subclass "</span> <span class="s2">"with a 'path' class attribute."</span> <span class="o">%</span> <span class="p">(</span><span class="n">module</span><span class="p">,</span> <span class="n">paths</span><span class="p">))</span> <span class="k">elif</span> <span class="ow">not</span> <span class="n">paths</span><span class="p">:</span> <span class="k">raise</span> <span class="n">ImproperlyConfigured</span><span class="p">(</span> <span class="s2">"The app module </span><span class="si">%r</span><span class="s2"> has no filesystem location, "</span> <span class="s2">"you must configure this app with an AppConfig subclass "</span> <span class="s2">"with a 'path' class attribute."</span> <span class="o">%</span> <span class="p">(</span><span class="n">module</span><span class="p">,))</span> <span class="k">return</span> <span class="n">upath</span><span class="p">(</span><span class="n">paths</span><span class="p">[</span><span class="mi">0</span><span class="p">])</span> <span class="nd">@classmethod</span> <span class="k">def</span> <span class="nf">create</span><span class="p">(</span><span class="n">cls</span><span class="p">,</span> <span class="n">entry</span><span class="p">):</span> <span class="sd">"""</span> <span class="sd"> Factory that creates an app config from an entry in INSTALLED_APPS.</span> <span class="sd"> """</span> <span class="k">try</span><span class="p">:</span> <span class="c1"># If import_module succeeds, entry is a path to an app module,</span> <span class="c1"># which may specify an app config class with default_app_config.</span> <span class="c1"># Otherwise, entry is a path to an app config class or an error.</span> <span class="n">module</span> <span class="o">=</span> <span class="n">import_module</span><span class="p">(</span><span class="n">entry</span><span class="p">)</span> <span class="k">except</span> <span class="ne">ImportError</span><span class="p">:</span> <span class="c1"># Track that importing as an app module failed. If importing as an</span> <span class="c1"># app config class fails too, we'll trigger the ImportError again.</span> <span class="n">module</span> <span class="o">=</span> <span class="kc">None</span> <span class="n">mod_path</span><span class="p">,</span> <span class="n">_</span><span class="p">,</span> <span class="n">cls_name</span> <span class="o">=</span> <span class="n">entry</span><span class="o">.</span><span class="n">rpartition</span><span class="p">(</span><span class="s1">'.'</span><span class="p">)</span> <span class="c1"># Raise the original exception when entry cannot be a path to an</span> <span class="c1"># app config class.</span> <span class="k">if</span> <span class="ow">not</span> <span class="n">mod_path</span><span class="p">:</span> <span class="k">raise</span> <span class="k">else</span><span class="p">:</span> <span class="k">try</span><span class="p">:</span> <span class="c1"># If this works, the app module specifies an app config class.</span> <span class="n">entry</span> <span class="o">=</span> <span class="n">module</span><span class="o">.</span><span class="n">default_app_config</span> <span class="k">except</span> <span class="ne">AttributeError</span><span class="p">:</span> <span class="c1"># Otherwise, it simply uses the default app config class.</span> <span class="k">return</span> <span class="n">cls</span><span class="p">(</span><span class="n">entry</span><span class="p">,</span> <span class="n">module</span><span class="p">)</span> <span class="k">else</span><span class="p">:</span> <span class="n">mod_path</span><span class="p">,</span> <span class="n">_</span><span class="p">,</span> <span class="n">cls_name</span> <span class="o">=</span> <span class="n">entry</span><span class="o">.</span><span class="n">rpartition</span><span class="p">(</span><span class="s1">'.'</span><span class="p">)</span> <span class="c1"># If we're reaching this point, we must attempt to load the app config</span> <span class="c1"># class located at <mod_path>.<cls_name></span> <span class="n">mod</span> <span class="o">=</span> <span class="n">import_module</span><span class="p">(</span><span class="n">mod_path</span><span class="p">)</span> <span class="k">try</span><span class="p">:</span> <span class="n">cls</span> <span class="o">=</span> <span class="nb">getattr</span><span class="p">(</span><span class="n">mod</span><span class="p">,</span> <span class="n">cls_name</span><span class="p">)</span> <span class="k">except</span> <span class="ne">AttributeError</span><span class="p">:</span> <span class="k">if</span> <span class="n">module</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span> <span class="c1"># If importing as an app module failed, that error probably</span> <span class="c1"># contains the most informative traceback. Trigger it again.</span> <span class="n">import_module</span><span class="p">(</span><span class="n">entry</span><span class="p">)</span> <span class="k">else</span><span class="p">:</span> <span class="k">raise</span> <span class="c1"># Check for obvious errors. (This check prevents duck typing, but</span> <span class="c1"># it could be removed if it became a problem in practice.)</span> <span class="k">if</span> <span class="ow">not</span> <span class="nb">issubclass</span><span class="p">(</span><span class="n">cls</span><span class="p">,</span> <span class="n">AppConfig</span><span class="p">):</span> <span class="k">raise</span> <span class="n">ImproperlyConfigured</span><span class="p">(</span> <span class="s2">"'</span><span class="si">%s</span><span class="s2">' isn't a subclass of AppConfig."</span> <span class="o">%</span> <span class="n">entry</span><span class="p">)</span> <span class="c1"># Obtain app name here rather than in AppClass.__init__ to keep</span> <span class="c1"># all error checking for entries in INSTALLED_APPS in one place.</span> <span class="k">try</span><span class="p">:</span> <span class="n">app_name</span> <span class="o">=</span> <span class="n">cls</span><span class="o">.</span><span class="n">name</span> <span class="k">except</span> <span class="ne">AttributeError</span><span class="p">:</span> <span class="k">raise</span> <span class="n">ImproperlyConfigured</span><span class="p">(</span> <span class="s2">"'</span><span class="si">%s</span><span class="s2">' must supply a name attribute."</span> <span class="o">%</span> <span class="n">entry</span><span class="p">)</span> <span class="c1"># Ensure app_name points to a valid module.</span> <span class="n">app_module</span> <span class="o">=</span> <span class="n">import_module</span><span class="p">(</span><span class="n">app_name</span><span class="p">)</span> <span class="c1"># Entry is a path to an app config class.</span> <span class="k">return</span> <span class="n">cls</span><span class="p">(</span><span class="n">app_name</span><span class="p">,</span> <span class="n">app_module</span><span class="p">)</span> <span class="k">def</span> <span class="nf">check_models_ready</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> <span class="sd">"""</span> <span class="sd"> Raises an exception if models haven't been imported yet.</span> <span class="sd"> """</span> <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">models</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span> <span class="k">raise</span> <span class="n">AppRegistryNotReady</span><span class="p">(</span> <span class="s2">"Models for app '</span><span class="si">%s</span><span class="s2">' haven't been imported yet."</span> <span class="o">%</span> <span class="bp">self</span><span class="o">.</span><span class="n">label</span><span class="p">)</span> <div class="viewcode-block" id="AppConfig.get_model"><a class="viewcode-back" href="../../../ref/applications.html#django.apps.AppConfig.get_model">[docs]</a> <span class="k">def</span> <span class="nf">get_model</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">model_name</span><span class="p">):</span> <span class="sd">"""</span> <span class="sd"> Returns the model with the given case-insensitive model_name.</span> <span class="sd"> Raises LookupError if no model exists with this name.</span> <span class="sd"> """</span> <span class="bp">self</span><span class="o">.</span><span class="n">check_models_ready</span><span class="p">()</span> <span class="k">try</span><span class="p">:</span> <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">models</span><span class="p">[</span><span class="n">model_name</span><span class="o">.</span><span class="n">lower</span><span class="p">()]</span> <span class="k">except</span> <span class="ne">KeyError</span><span class="p">:</span> <span class="k">raise</span> <span class="ne">LookupError</span><span class="p">(</span> <span class="s2">"App '</span><span class="si">%s</span><span class="s2">' doesn't have a '</span><span class="si">%s</span><span class="s2">' model."</span> <span class="o">%</span> <span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">label</span><span class="p">,</span> <span class="n">model_name</span><span class="p">))</span></div> <div class="viewcode-block" id="AppConfig.get_models"><a class="viewcode-back" href="../../../ref/applications.html#django.apps.AppConfig.get_models">[docs]</a> <span class="k">def</span> <span class="nf">get_models</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">include_auto_created</span><span class="o">=</span><span class="kc">False</span><span class="p">,</span> <span class="n">include_deferred</span><span class="o">=</span><span class="kc">False</span><span class="p">,</span> <span class="n">include_swapped</span><span class="o">=</span><span class="kc">False</span><span class="p">):</span> <span class="sd">"""</span> <span class="sd"> Returns an iterable of models.</span> <span class="sd"> By default, the following models aren't included:</span> <span class="sd"> - auto-created models for many-to-many relations without</span> <span class="sd"> an explicit intermediate table,</span> <span class="sd"> - models created to satisfy deferred attribute queries,</span> <span class="sd"> - models that have been swapped out.</span> <span class="sd"> Set the corresponding keyword argument to True to include such models.</span> <span class="sd"> Keyword arguments aren't documented; they're a private API.</span> <span class="sd"> """</span> <span class="bp">self</span><span class="o">.</span><span class="n">check_models_ready</span><span class="p">()</span> <span class="k">for</span> <span class="n">model</span> <span class="ow">in</span> <span class="bp">self</span><span class="o">.</span><span class="n">models</span><span class="o">.</span><span class="n">values</span><span class="p">():</span> <span class="k">if</span> <span class="n">model</span><span class="o">.</span><span class="n">_deferred</span> <span class="ow">and</span> <span class="ow">not</span> <span class="n">include_deferred</span><span class="p">:</span> <span class="k">continue</span> <span class="k">if</span> <span class="n">model</span><span class="o">.</span><span class="n">_meta</span><span class="o">.</span><span class="n">auto_created</span> <span class="ow">and</span> <span class="ow">not</span> <span class="n">include_auto_created</span><span class="p">:</span> <span class="k">continue</span> <span class="k">if</span> <span class="n">model</span><span class="o">.</span><span class="n">_meta</span><span class="o">.</span><span class="n">swapped</span> <span class="ow">and</span> <span class="ow">not</span> <span class="n">include_swapped</span><span class="p">:</span> <span class="k">continue</span> <span class="k">yield</span> <span class="n">model</span></div> <span class="k">def</span> <span class="nf">import_models</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">all_models</span><span class="p">):</span> <span class="c1"># Dictionary of models for this app, primarily maintained in the</span> <span class="c1"># 'all_models' attribute of the Apps this AppConfig is attached to.</span> <span class="c1"># Injected as a parameter because it gets populated when models are</span> <span class="c1"># imported, which might happen before populate() imports models.</span> <span class="bp">self</span><span class="o">.</span><span class="n">models</span> <span class="o">=</span> <span class="n">all_models</span> <span class="k">if</span> <span class="n">module_has_submodule</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">module</span><span class="p">,</span> <span class="n">MODELS_MODULE_NAME</span><span class="p">):</span> <span class="n">models_module_name</span> <span class="o">=</span> <span class="s1">'</span><span class="si">%s</span><span class="s1">.</span><span class="si">%s</span><span class="s1">'</span> <span class="o">%</span> <span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">name</span><span class="p">,</span> <span class="n">MODELS_MODULE_NAME</span><span class="p">)</span> <span class="bp">self</span><span class="o">.</span><span class="n">models_module</span> <span class="o">=</span> <span class="n">import_module</span><span class="p">(</span><span class="n">models_module_name</span><span class="p">)</span> <div class="viewcode-block" id="AppConfig.ready"><a class="viewcode-back" href="../../../ref/applications.html#django.apps.AppConfig.ready">[docs]</a> <span class="k">def</span> <span class="nf">ready</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span> <span class="sd">"""</span> <span class="sd"> Override this method in subclasses to run code when Django starts.</span> <span class="sd"> """</span></div></div> </pre></div> </div> </div> </div> <div class="yui-b" id="sidebar"> <div class="sphinxsidebar" role="navigation" aria-label="main navigation"> <div class="sphinxsidebarwrapper"> <h3>Browse</h3> <ul> </ul> <h3>You are here:</h3> <ul> <li> <a href="../../../index.html">Django 1.8.19 documentation</a> <ul><li><a href="../../index.html">Module code</a> <ul><li><a href="../../django.html">django</a> <ul><li>django.apps.config</li></ul> </li></ul></li></ul> </li> </ul> <div id="searchbox" style="display: none" role="search"> <h3>Quick search</h3> <form class="search" action="../../../search.html" method="get"> <div><input type="text" name="q" /></div> <div><input type="submit" value="Go" /></div> <input type="hidden" name="check_keywords" value="yes" /> <input type="hidden" name="area" value="default" /> </form> </div> <script type="text/javascript">$('#searchbox').show(0);</script> </div> </div> <h3>Last update:</h3> <p class="topless">Mar 10, 2018</p> </div> </div> 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