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  30. 	<p>Django Categories v1.1 documentation</p>
    31. 

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  33. 	<div id="title"><h1>Creating Custom Categories</h1></div>
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    50. 

  50. <li class="toctree-l1"><a class="reference internal" href="usage.html">Using categories in templates</a></li>
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    53. 

  53. <li class="toctree-l1 current"><a class="current reference internal" href="">Creating Custom Categories</a><ul>
    54. 

  54. <li class="toctree-l2"><a class="reference internal" href="#name-only">Name only</a></li>
    55. 

  55. <li class="toctree-l2"><a class="reference internal" href="#name-and-other-data">Name and other data</a></li>
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  61.       <h3>This Page</h3>
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    63. 

  63.         <li><a href="_sources/custom_categories.txt"
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  64.                rel="nofollow">Show Source</a></li>
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    93. 

  93.   <div class="section" id="creating-custom-categories">
    94. 

  94. <span id="id1"></span><h1>Creating Custom Categories<a class="headerlink" href="#creating-custom-categories" title="Permalink to this headline"></a></h1>
    95. 

  95. <p>Django Categories isn&#8217;t just for using a single category model. It allows you to create your own custom category-like models with as little or much customization as you need.</p>
    96. 

  96. <div class="section" id="name-only">
    97. 

  97. <h2>Name only<a class="headerlink" href="#name-only" title="Permalink to this headline"></a></h2>
    98. 

  98. <p>For many cases, you want a simple user-managed lookup table. You can do this with just a little bit of code. The resulting model will include name, slug and active fields and a hierarchical admin.</p>
    99. 

  99. <ol class="arabic">
    100. 

  100. <li><p class="first">Create a model that subclasses <a class="reference internal" href="reference/models.html#CategoryBase" title="CategoryBase"><tt class="xref py py-class docutils literal"><span class="pre">CategoryBase</span></tt></a></p>
    101. 

  101. <div class="highlight-python"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre>1
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  109. 9</pre></div></td><td class="code"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">categories.models</span> <span class="kn">import</span> <span class="n">CategoryBase</span>
    110. 

  110. 

  111. <span class="k">class</span> <span class="nc">SimpleCategory</span><span class="p">(</span><span class="n">CategoryBase</span><span class="p">):</span>
    112. 

  112.     <span class="sd">&quot;&quot;&quot;</span>
    113. 

  113. <span class="sd">    A simple of catgorizing example</span>
    114. 

  114. <span class="sd">    &quot;&quot;&quot;</span>
    115. 

  115.     
    116. 

  116.     <span class="k">class</span> <span class="nc">Meta</span><span class="p">:</span>
    117. 

  117.         <span class="n">verbose_name_plural</span> <span class="o">=</span> <span class="s">&#39;simple categories&#39;</span>
    118. 

  118. </pre></div>
    119. 

  119. </td></tr></table></div>
    120. 

  120. </li>
    121. 

  121. <li><p class="first">Create a subclass of CategoryBaseAdmin.</p>
    122. 

  122. <div class="highlight-python"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre> 1
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  131. 10</pre></div></td><td class="code"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">django.contrib</span> <span class="kn">import</span> <span class="n">admin</span>
    132. 

  132. 

  133. <span class="kn">from</span> <span class="nn">categories.admin</span> <span class="kn">import</span> <span class="n">CategoryBaseAdmin</span>
    134. 

  134. 

  135. <span class="kn">from</span> <span class="nn">.models</span> <span class="kn">import</span> <span class="n">SimpleCategory</span>
    136. 

  136. 

  137. <span class="k">class</span> <span class="nc">SimpleCategoryAdmin</span><span class="p">(</span><span class="n">CategoryBaseAdmin</span><span class="p">):</span>
    138. 

  138.     <span class="k">pass</span>
    139. 

  139. 

  140. <span class="n">admin</span><span class="o">.</span><span class="n">site</span><span class="o">.</span><span class="n">register</span><span class="p">(</span><span class="n">SimpleCategory</span><span class="p">,</span> <span class="n">SimpleCategoryAdmin</span><span class="p">)</span>
    141. 

  141. </pre></div>
    142. 

  142. </td></tr></table></div>
    143. 

  143. </li>
    144. 

  144. <li><p class="first">Register your model and custom model admin class.</p>
    145. 

  145. </li>
    146. 

  146. </ol>
    147. 

  147. </div>
    148. 

  148. <div class="section" id="name-and-other-data">
    149. 

  149. <h2>Name and other data<a class="headerlink" href="#name-and-other-data" title="Permalink to this headline"></a></h2>
    150. 

  150. <p>Sometimes you need more functionality, such as extra metadata and custom functions. 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 in this package does this.</p>
    151. 

  151. <ol class="arabic">
    152. 

  152. <li><p class="first">Create a model that subclasses <a class="reference internal" href="reference/models.html#CategoryBase" title="CategoryBase"><tt class="xref py py-class docutils literal"><span class="pre">CategoryBase</span></tt></a> as above.</p>
    153. 

  153. </li>
    154. 

  154. <li><p class="first">Add new fields to the model. 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 adds these extra fields.</p>
    155. 

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  183. 29</pre></div></td><td class="code"><div class="highlight"><pre><span class="k">class</span> <span class="nc">Category</span><span class="p">(</span><span class="n">CategoryBase</span><span class="p">):</span>
    184. 

  184.     <span class="n">thumbnail</span> <span class="o">=</span> <span class="n">models</span><span class="o">.</span><span class="n">FileField</span><span class="p">(</span>
    185. 

  185.         <span class="n">upload_to</span><span class="o">=</span><span class="n">THUMBNAIL_UPLOAD_PATH</span><span class="p">,</span> 
    186. 

  186.         <span class="n">null</span><span class="o">=</span><span class="bp">True</span><span class="p">,</span> <span class="n">blank</span><span class="o">=</span><span class="bp">True</span><span class="p">,</span>
    187. 

  187.         <span class="n">storage</span><span class="o">=</span><span class="n">STORAGE</span><span class="p">(),)</span>
    188. 

  188.     <span class="n">thumbnail_width</span> <span class="o">=</span> <span class="n">models</span><span class="o">.</span><span class="n">IntegerField</span><span class="p">(</span><span class="n">blank</span><span class="o">=</span><span class="bp">True</span><span class="p">,</span> <span class="n">null</span><span class="o">=</span><span class="bp">True</span><span class="p">)</span>
    189. 

  189.     <span class="n">thumbnail_height</span> <span class="o">=</span> <span class="n">models</span><span class="o">.</span><span class="n">IntegerField</span><span class="p">(</span><span class="n">blank</span><span class="o">=</span><span class="bp">True</span><span class="p">,</span> <span class="n">null</span><span class="o">=</span><span class="bp">True</span><span class="p">)</span>
    190. 

  190.     <span class="n">order</span> <span class="o">=</span> <span class="n">models</span><span class="o">.</span><span class="n">IntegerField</span><span class="p">(</span><span class="n">default</span><span class="o">=</span><span class="mi">0</span><span class="p">)</span>
    191. 

  191.     <span class="n">alternate_title</span> <span class="o">=</span> <span class="n">models</span><span class="o">.</span><span class="n">CharField</span><span class="p">(</span>
    192. 

  192.         <span class="n">blank</span><span class="o">=</span><span class="bp">True</span><span class="p">,</span>
    193. 

  193.         <span class="n">default</span><span class="o">=</span><span class="s">&quot;&quot;</span><span class="p">,</span>
    194. 

  194.         <span class="n">max_length</span><span class="o">=</span><span class="mi">100</span><span class="p">,</span>
    195. 

  195.         <span class="n">help_text</span><span class="o">=</span><span class="s">&quot;An alternative title to use on pages with this category.&quot;</span><span class="p">)</span>
    196. 

  196.     <span class="n">alternate_url</span> <span class="o">=</span> <span class="n">models</span><span class="o">.</span><span class="n">CharField</span><span class="p">(</span>
    197. 

  197.         <span class="n">blank</span><span class="o">=</span><span class="bp">True</span><span class="p">,</span> 
    198. 

  198.         <span class="n">max_length</span><span class="o">=</span><span class="mi">200</span><span class="p">,</span> 
    199. 

  199.         <span class="n">help_text</span><span class="o">=</span><span class="s">&quot;An alternative URL to use instead of the one derived from &quot;</span>
    200. 

  200.                   <span class="s">&quot;the category hierarchy.&quot;</span><span class="p">)</span>
    201. 

  201.     <span class="n">description</span> <span class="o">=</span> <span class="n">models</span><span class="o">.</span><span class="n">TextField</span><span class="p">(</span><span class="n">blank</span><span class="o">=</span><span class="bp">True</span><span class="p">,</span> <span class="n">null</span><span class="o">=</span><span class="bp">True</span><span class="p">)</span>
    202. 

  202.     <span class="n">meta_keywords</span> <span class="o">=</span> <span class="n">models</span><span class="o">.</span><span class="n">CharField</span><span class="p">(</span>
    203. 

  203.         <span class="n">blank</span><span class="o">=</span><span class="bp">True</span><span class="p">,</span>
    204. 

  204.         <span class="n">default</span><span class="o">=</span><span class="s">&quot;&quot;</span><span class="p">,</span>
    205. 

  205.         <span class="n">max_length</span><span class="o">=</span><span class="mi">255</span><span class="p">,</span>
    206. 

  206.         <span class="n">help_text</span><span class="o">=</span><span class="s">&quot;Comma-separated keywords for search engines.&quot;</span><span class="p">)</span>
    207. 

  207.     <span class="n">meta_extra</span> <span class="o">=</span> <span class="n">models</span><span class="o">.</span><span class="n">TextField</span><span class="p">(</span>
    208. 

  208.         <span class="n">blank</span><span class="o">=</span><span class="bp">True</span><span class="p">,</span>
    209. 

  209.         <span class="n">default</span><span class="o">=</span><span class="s">&quot;&quot;</span><span class="p">,</span>
    210. 

  210.         <span class="n">help_text</span><span class="o">=</span><span class="s">&quot;(Advanced) Any additional HTML to be placed verbatim &quot;</span>
    211. 

  211.                   <span class="s">&quot;in the &amp;lt;head&amp;gt;&quot;</span><span class="p">)</span>
    212. 

  212. </pre></div>
    213. 

  213. </td></tr></table></div>
    214. 

  214. </li>
    215. 

  215. <li><p class="first">Add new methods to the model. For example, 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 adds several new methods, including overriding the <tt class="xref py py-meth docutils literal"><span class="pre">save()</span></tt> method.</p>
    216. 

  216. <div class="highlight-python"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre> 1
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  217.  2
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  220.  5
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  221.  6
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  229. 14
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  230. 15</pre></div></td><td class="code"><div class="highlight"><pre><span class="k">def</span> <span class="nf">save</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>
    231. 

  231.     <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">thumbnail</span><span class="p">:</span>
    232. 

  232.         <span class="kn">from</span> <span class="nn">django.core.files.images</span> <span class="kn">import</span> <span class="n">get_image_dimensions</span>
    233. 

  233.         <span class="kn">import</span> <span class="nn">django</span>
    234. 

  234.         <span class="k">if</span> <span class="n">django</span><span class="o">.</span><span class="n">VERSION</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span> <span class="o">&lt;</span> <span class="mi">2</span><span class="p">:</span>
    235. 

  235.             <span class="n">width</span><span class="p">,</span> <span class="n">height</span> <span class="o">=</span> <span class="n">get_image_dimensions</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">thumbnail</span><span class="o">.</span><span class="n">file</span><span class="p">)</span>
    236. 

  236.         <span class="k">else</span><span class="p">:</span>
    237. 

  237.             <span class="n">width</span><span class="p">,</span> <span class="n">height</span> <span class="o">=</span> <span class="n">get_image_dimensions</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">thumbnail</span><span class="o">.</span><span class="n">file</span><span class="p">,</span> <span class="n">close</span><span class="o">=</span><span class="bp">True</span><span class="p">)</span>
    238. 

  238.     <span class="k">else</span><span class="p">:</span>
    239. 

  239.         <span class="n">width</span><span class="p">,</span> <span class="n">height</span> <span class="o">=</span> <span class="bp">None</span><span class="p">,</span> <span class="bp">None</span>
    240. 

  240.     
    241. 

  241.     <span class="bp">self</span><span class="o">.</span><span class="n">thumbnail_width</span> <span class="o">=</span> <span class="n">width</span>
    242. 

  242.     <span class="bp">self</span><span class="o">.</span><span class="n">thumbnail_height</span> <span class="o">=</span> <span class="n">height</span>
    243. 

  243.     
    244. 

  244.     <span class="nb">super</span><span class="p">(</span><span class="n">Category</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">save</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>
    245. 

  245. </pre></div>
    246. 

  246. </td></tr></table></div>
    247. 

  247. </li>
    248. 

  248. <li><p class="first">Alter <tt class="xref py py-class docutils literal"><span class="pre">Meta</span></tt> or <tt class="xref py py-class docutils literal"><span class="pre">MPTTMeta</span></tt> class. Either of these inner classes can be overridden, however your <tt class="xref py py-class docutils literal"><span class="pre">Meta</span></tt> class should inherit <tt class="xref py py-class docutils literal"><span class="pre">CategoryBase.Meta</span></tt>. Options for <tt class="xref py py-class docutils literal"><span class="pre">Meta</span></tt> are in the <a class="reference external" href="http://readthedocs.org/docs/django-mptt/en/latest/models.html#model-options">Django-MPTT docs</a>.</p>
    249. 

  249. <div class="highlight-python"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre>1
    250. 

  250. 2
    251. 

  251. 3
    252. 

  252. 4
    253. 

  253. 5</pre></div></td><td class="code"><div class="highlight"><pre><span class="k">class</span> <span class="nc">Meta</span><span class="p">(</span><span class="n">CategoryBase</span><span class="o">.</span><span class="n">Meta</span><span class="p">):</span>
    254. 

  254.     <span class="n">verbose_name_plural</span> <span class="o">=</span> <span class="s">&#39;categories&#39;</span>
    255. 

  255. 

  256. <span class="k">class</span> <span class="nc">MPTTMeta</span><span class="p">:</span>
    257. 

  257.     <span class="n">order_insertion_by</span> <span class="o">=</span> <span class="p">(</span><span class="s">&#39;order&#39;</span><span class="p">,</span> <span class="s">&#39;name&#39;</span><span class="p">)</span>
    258. 

  258. </pre></div>
    259. 

  259. </td></tr></table></div>
    260. 

  260. </li>
    261. 

  261. <li><p class="first">For the admin, you must create a form that subclasses <tt class="xref py py-class docutils literal"><span class="pre">CategoryBaseAdminForm</span></tt> and at least sets the <tt class="docutils literal"><span class="pre">Meta.model</span></tt> attribute. You can also alter the form fields and cleaning methods, as <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> does.</p>
    262. 

  262. <div class="highlight-python"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre>1
    263. 

  263. 2
    264. 

  264. 3
    265. 

  265. 4
    266. 

  266. 5
    267. 

  267. 6
    268. 

  268. 7
    269. 

  269. 8
    270. 

  270. 9</pre></div></td><td class="code"><div class="highlight"><pre><span class="k">class</span> <span class="nc">CategoryAdminForm</span><span class="p">(</span><span class="n">CategoryBaseAdminForm</span><span class="p">):</span>
    271. 

  271.     <span class="k">class</span> <span class="nc">Meta</span><span class="p">:</span>
    272. 

  272.         <span class="n">model</span> <span class="o">=</span> <span class="n">Category</span>
    273. 

  273.     
    274. 

  274.     <span class="k">def</span> <span class="nf">clean_alternate_title</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
    275. 

  275.         <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">instance</span> <span class="ow">is</span> <span class="bp">None</span> <span class="ow">or</span> <span class="ow">not</span> <span class="bp">self</span><span class="o">.</span><span class="n">cleaned_data</span><span class="p">[</span><span class="s">&#39;alternate_title&#39;</span><span class="p">]:</span>
    276. 

  276.             <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">cleaned_data</span><span class="p">[</span><span class="s">&#39;name&#39;</span><span class="p">]</span>
    277. 

  277.         <span class="k">else</span><span class="p">:</span>
    278. 

  278.             <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">cleaned_data</span><span class="p">[</span><span class="s">&#39;alternate_title&#39;</span><span class="p">]</span>
    279. 

  279. </pre></div>
    280. 

  280. </td></tr></table></div>
    281. 

  281. </li>
    282. 

  282. <li><p class="first">Next you must subclass <tt class="xref py py-class docutils literal"><span class="pre">CategoryBaseAdmin</span></tt> and assign the <tt class="docutils literal"><span class="pre">form</span></tt> attribute the form class created above. You can alter any other attributes as necessary.</p>
    283. 

  283. <div class="highlight-python"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre> 1
    284. 

  284.  2
    285. 

  285.  3
    286. 

  286.  4
    287. 

  287.  5
    288. 

  288.  6
    289. 

  289.  7
    290. 

  290.  8
    291. 

  291.  9
    292. 

  292. 10
    293. 

  293. 11
    294. 

  294. 12
    295. 

  295. 13
    296. 

  296. 14
    297. 

  297. 15
    298. 

  298. 16
    299. 

  299. 17</pre></div></td><td class="code"><div class="highlight"><pre><span class="k">class</span> <span class="nc">CategoryAdmin</span><span class="p">(</span><span class="n">CategoryBaseAdmin</span><span class="p">):</span>
    300. 

  300.     <span class="n">form</span> <span class="o">=</span> <span class="n">CategoryAdminForm</span>
    301. 

  301.     <span class="n">list_display</span> <span class="o">=</span> <span class="p">(</span><span class="s">&#39;name&#39;</span><span class="p">,</span> <span class="s">&#39;alternate_title&#39;</span><span class="p">,</span> <span class="s">&#39;active&#39;</span><span class="p">)</span>
    302. 

  302.     <span class="n">fieldsets</span> <span class="o">=</span> <span class="p">(</span>
    303. 

  303.         <span class="p">(</span><span class="bp">None</span><span class="p">,</span> <span class="p">{</span>
    304. 

  304.             <span class="s">&#39;fields&#39;</span><span class="p">:</span> <span class="p">(</span><span class="s">&#39;parent&#39;</span><span class="p">,</span> <span class="s">&#39;name&#39;</span><span class="p">,</span> <span class="s">&#39;thumbnail&#39;</span><span class="p">,</span> <span class="s">&#39;active&#39;</span><span class="p">)</span>
    305. 

  305.         <span class="p">}),</span>
    306. 

  306.         <span class="p">(</span><span class="s">&#39;Meta Data&#39;</span><span class="p">,</span> <span class="p">{</span>
    307. 

  307.             <span class="s">&#39;fields&#39;</span><span class="p">:</span> <span class="p">(</span><span class="s">&#39;alternate_title&#39;</span><span class="p">,</span> <span class="s">&#39;alternate_url&#39;</span><span class="p">,</span> <span class="s">&#39;description&#39;</span><span class="p">,</span> 
    308. 

  308.                         <span class="s">&#39;meta_keywords&#39;</span><span class="p">,</span> <span class="s">&#39;meta_extra&#39;</span><span class="p">),</span>
    309. 

  309.             <span class="s">&#39;classes&#39;</span><span class="p">:</span> <span class="p">(</span><span class="s">&#39;collapse&#39;</span><span class="p">,),</span>
    310. 

  310.         <span class="p">}),</span>
    311. 

  311.         <span class="p">(</span><span class="s">&#39;Advanced&#39;</span><span class="p">,</span> <span class="p">{</span>
    312. 

  312.             <span class="s">&#39;fields&#39;</span><span class="p">:</span> <span class="p">(</span><span class="s">&#39;order&#39;</span><span class="p">,</span> <span class="s">&#39;slug&#39;</span><span class="p">),</span>
    313. 

  313.             <span class="s">&#39;classes&#39;</span><span class="p">:</span> <span class="p">(</span><span class="s">&#39;collapse&#39;</span><span class="p">,),</span>
    314. 

  314.         <span class="p">}),</span>
    315. 

  315.     <span class="p">)</span>
    316. 

  316. </pre></div>
    317. 

  317. </td></tr></table></div>
    318. 

  318. </li>
    319. 

  319. </ol>
    320. 

  320. </div>
    321. 

  321. </div>
    322. 

  322. 

  323. 

  324.           </div> 
    325. 

  325.         </div>
    326. 

  326.       </div>
    327. 

  327.     <div class="footer">
    328. 

  328.     <p>
    329. 

  329.       &copy; Copyright 2010-2012, Corey Oordt.
    330. 

  330.       Created using <a href="http://sphinx.pocoo.org/">Sphinx</a> 1.0.7.
    331. 

  331. 	</p>
    332. 

  332.     </div>
    333. 

  333.       <div class="clearer"></div>
    334. 

  334.     </div>
    335. 

  335. 	<div id="breadcrumbs">
    336. 

  336. 		Creating Custom Categories
    337. 

  337. 		</ul>
    338. 

  338. 	</div>
    339. 

  339. 	<script type="text/javascript" charset="utf-8" src="_static/toc.js"></script>
    340. 

  340.   </body>
    341. 

  341. </html>
    342.