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<p>Django Categories v1.1 documentation</p>
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<div id="title"><h1>Getting Started</h1></div>
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<h1>Getting Started<a class="headerlink" href="#getting-started" title="Permalink to this headline">¶</a></h1>
<p>You can use Django Categories in two ways:</p>
<ol class="arabic">
<li><p class="first">As storage for one tree of categories, using the <a class="reference internal" href="reference/models.html#Category" title="Category"><tt class="xref py py-class docutils literal"><span class="pre">Category</span></tt></a> model:</p>
<div class="highlight-python"><pre>Top Category 1
Subcategory 1-1
Subcategory 1-2
subcategory 1-2-1
Top Category 2
Subcategory 2-1</pre>
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</li>
<li><p class="first">As the basis for several custom categories (see <a class="reference internal" href="custom_categories.html#creating-custom-categories"><em>Creating Custom Categories</em></a>), e.g. a <strong>MusicGenre</strong> model</p>
<div class="highlight-python"><pre>MusicGenre 1
MusicSubGenre 1-1
MusicSubGenre 1-2
MusicSubGenre 1-2-1
MusicGenre 2
MusicSubGenre 2-1</pre>
</div>
<p>and a <strong>Subject</strong> model</p>
<div class="highlight-python"><pre>Subject 1
Discipline 1-1
Discipline 1-2
SubDiscipline 1-2-1
Subject 2
Discipline 2-1</pre>
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<div class="section" id="connecting-your-model-with-django-categories">
<h2>Connecting your model with Django-Categories<a class="headerlink" href="#connecting-your-model-with-django-categories" title="Permalink to this headline">¶</a></h2>
<p>There are two ways to add Category fields to an application. If you are in control of the code (it&#8217;s your application) or you are willing to take control of the code (fork someone else&#8217;s app) you can make a <a class="reference internal" href="#hard-coded-connection"><em>Hard Coded Connection</em></a>.</p>
<p>For 3rd-party apps or even your own apps that you don&#8217;t wish to add Django-Categories as a dependency, you can configure a <a class="reference internal" href="#lazy-connection"><em>Lazy Connection</em></a>.</p>
<div class="section" id="hard-coded-connection">
<span id="id1"></span><h3>Hard Coded Connection<a class="headerlink" href="#hard-coded-connection" title="Permalink to this headline">¶</a></h3>
<p>Hard coded connections are done in the exact same way you handle any other foreign key or many-to-many relations to a model.</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">django.db</span> <span class="kn">import</span> <span class="n">models</span>
<span class="k">class</span> <span class="nc">MyModel</span><span class="p">(</span><span class="n">models</span><span class="o">.</span><span class="n">Model</span><span class="p">):</span>
<span class="n">name</span> <span class="o">=</span> <span class="n">models</span><span class="o">.</span><span class="n">CharField</span><span class="p">(</span><span class="n">max_length</span><span class="o">=</span><span class="mi">100</span><span class="p">)</span>
<span class="n">category</span> <span class="o">=</span> <span class="n">models</span><span class="o">.</span><span class="n">ForeignKey</span><span class="p">(</span><span class="s">&#39;categories.Category&#39;</span><span class="p">)</span>
</pre></div>
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<p>Don&#8217;t forget to add the field or fields to your <tt class="docutils literal"><span class="pre">ModelAdmin</span></tt> class as well.</p>
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<div class="section" id="lazy-connection">
<span id="id2"></span><h3>Lazy Connection<a class="headerlink" href="#lazy-connection" title="Permalink to this headline">¶</a></h3>
<p>Lazy connections are done through configuring Django Categories in the project&#8217;s <tt class="docutils literal"><span class="pre">settings.py</span></tt> file. When the project starts up, the configured fields are dynamically added to the configured models and admin.</p>
<p>If you do this before you have created the database (before you ran <tt class="docutils literal"><span class="pre">manage.py</span> <span class="pre">syncdb</span></tt>), the fields will also be in the tables. If you do this after you have already created all the tables, you can run <tt class="docutils literal"><span class="pre">manage.py</span> <span class="pre">add_category_fields</span></tt> to create the fields (this requires Django South to be installed).</p>
<p>You add a many-to-one or many-to-many relationship with Django Categories using the <a class="reference internal" href="reference/settings.html#fk-registry"><em>FK_REGISTRY</em></a> and <a class="reference internal" href="reference/settings.html#m2m-registry"><em>M2M_REGISTRY</em></a> settings respectively. For more information see <a class="reference internal" href="registering_models.html#registering-models"><em>Registering Models</em></a>.</p>
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