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<div class="section" id="other-mixins">
<h1><a class="toc-backref" href="#id12">Other Mixins</a><a class="headerlink" href="#other-mixins" title="Permalink to this headline">¶</a></h1>
<p>These mixins handle other random bits of Django’s views, like controlling output, controlling content types, or setting values in the context.</p>
<div class="contents topic" id="contents">
<p class="topic-title first">Contents</p>
<ul class="simple">
<li><a class="reference internal" href="#other-mixins" id="id12">Other Mixins</a><ul>
<li><a class="reference internal" href="#setheadlinemixin" id="id13">SetHeadlineMixin</a><ul>
<li><a class="reference internal" href="#static-example" id="id14">Static Example</a></li>
<li><a class="reference internal" href="#dynamic-example" id="id15">Dynamic Example</a></li>
</ul>
</li>
<li><a class="reference internal" href="#staticcontextmixin" id="id16">StaticContextMixin</a><ul>
<li><a class="reference internal" href="#view-example" id="id17">View Example</a></li>
<li><a class="reference internal" href="#url-example" id="id18">URL Example</a></li>
</ul>
</li>
<li><a class="reference internal" href="#selectrelatedmixin" id="id19">SelectRelatedMixin</a></li>
<li><a class="reference internal" href="#prefetchrelatedmixin" id="id20">PrefetchRelatedMixin</a></li>
<li><a class="reference internal" href="#jsonresponsemixin" id="id21">JSONResponseMixin</a></li>
<li><a class="reference internal" href="#jsonrequestresponsemixin" id="id22">JsonRequestResponseMixin</a></li>
<li><a class="reference internal" href="#ajaxresponsemixin" id="id23">AjaxResponseMixin</a></li>
<li><a class="reference internal" href="#orderablelistmixin" id="id24">OrderableListMixin</a></li>
<li><a class="reference internal" href="#canonicalslugdetailmixin" id="id25">CanonicalSlugDetailMixin</a></li>
<li><a class="reference internal" href="#messagemixin" id="id26">MessageMixin</a></li>
<li><a class="reference internal" href="#allverbsmixin" id="id27">AllVerbsMixin</a></li>
</ul>
</li>
</ul>
</div>
<div class="section" id="setheadlinemixin">
<span id="id1"></span><h2><a class="toc-backref" href="#id13">SetHeadlineMixin</a><a class="headerlink" href="#setheadlinemixin" title="Permalink to this headline">¶</a></h2>
<p>The <code class="docutils literal"><span class="pre">SetHeadlineMixin</span></code> allows you to <em>statically</em> or <em>programmatically</em> set the headline of any of your views. Ideally, you’ll write as few templates as possible, so a mixin like this helps you reuse generic templates. Its usage is amazingly straightforward and works much like Django’s built-in <code class="docutils literal"><span class="pre">get_queryset</span></code> method. This mixin has two ways of being used:</p>
<div class="section" id="static-example">
<h3><a class="toc-backref" href="#id14">Static Example</a><a class="headerlink" href="#static-example" title="Permalink to this headline">¶</a></h3>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">django.utils.translation</span> <span class="k">import</span> <span class="n">ugettext_lazy</span> <span class="k">as</span> <span class="n">_</span>
<span class="kn">from</span> <span class="nn">django.views</span> <span class="k">import</span> <span class="n">TemplateView</span>
<span class="kn">from</span> <span class="nn">braces.views</span> <span class="k">import</span> <span class="n">SetHeadlineMixin</span>
<span class="k">class</span> <span class="nc">HeadlineView</span><span class="p">(</span><span class="n">SetHeadlineMixin</span><span class="p">,</span> <span class="n">TemplateView</span><span class="p">):</span>
<span class="n">headline</span> <span class="o">=</span> <span class="n">_</span><span class="p">(</span><span class="s2">u"This is our headline"</span><span class="p">)</span>
<span class="n">template_name</span> <span class="o">=</span> <span class="s2">u"path/to/template.html"</span>
</pre></div>
</div>
</div>
<div class="section" id="dynamic-example">
<h3><a class="toc-backref" href="#id15">Dynamic Example</a><a class="headerlink" href="#dynamic-example" title="Permalink to this headline">¶</a></h3>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">datetime</span> <span class="k">import</span> <span class="n">date</span>
<span class="kn">from</span> <span class="nn">django.views</span> <span class="k">import</span> <span class="n">TemplateView</span>
<span class="kn">from</span> <span class="nn">braces.views</span> <span class="k">import</span> <span class="n">SetHeadlineMixin</span>
<span class="k">class</span> <span class="nc">HeadlineView</span><span class="p">(</span><span class="n">SetHeadlineMixin</span><span class="p">,</span> <span class="n">TemplateView</span><span class="p">):</span>
<span class="n">template_name</span> <span class="o">=</span> <span class="s2">u"path/to/template.html"</span>
<span class="k">def</span> <span class="nf">get_headline</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="s2">u"This is our headline for </span><span class="si">{0}</span><span class="s2">"</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">date</span><span class="o">.</span><span class="n">today</span><span class="p">()</span><span class="o">.</span><span class="n">isoformat</span><span class="p">())</span>
</pre></div>
</div>
<p>For both usages, the context now contains a <code class="docutils literal"><span class="pre">headline</span></code> key with your headline.</p>
</div>
</div>
<div class="section" id="staticcontextmixin">
<span id="id2"></span><h2><a class="toc-backref" href="#id16">StaticContextMixin</a><a class="headerlink" href="#staticcontextmixin" title="Permalink to this headline">¶</a></h2>
<div class="versionadded">
<p><span class="versionmodified">New in version 1.4.</span></p>
</div>
<p>The <code class="docutils literal"><span class="pre">StaticContextMixin</span></code> allows you to easily set static context data by using the <code class="docutils literal"><span class="pre">static_context</span></code> property.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">While it’s possible to override the <code class="docutils literal"><span class="pre">StaticContextMixin.get_static_context</span> <span class="pre">method</span></code>, it’s not very practical. If you have a need to override a method for dynamic context data it’s best to override the standard <code class="docutils literal"><span class="pre">get_context_data</span></code> method of Django’s generic class-based views.</p>
</div>
<div class="section" id="view-example">
<h3><a class="toc-backref" href="#id17">View Example</a><a class="headerlink" href="#view-example" title="Permalink to this headline">¶</a></h3>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="c1"># views.py</span>
<span class="kn">from</span> <span class="nn">django.views</span> <span class="k">import</span> <span class="n">TemplateView</span>
<span class="kn">from</span> <span class="nn">braces.views</span> <span class="k">import</span> <span class="n">StaticContextMixin</span>
<span class="k">class</span> <span class="nc">ContextTemplateView</span><span class="p">(</span><span class="n">StaticContextMixin</span><span class="p">,</span> <span class="n">TemplateView</span><span class="p">):</span>
<span class="n">static_context</span> <span class="o">=</span> <span class="p">{</span><span class="s2">u"nav_home"</span><span class="p">:</span> <span class="kc">True</span><span class="p">}</span>
</pre></div>
</div>
</div>
<div class="section" id="url-example">
<h3><a class="toc-backref" href="#id18">URL Example</a><a class="headerlink" href="#url-example" title="Permalink to this headline">¶</a></h3>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="c1"># urls.py</span>
<span class="n">urlpatterns</span> <span class="o">=</span> <span class="n">patterns</span><span class="p">(</span>
<span class="s1">''</span><span class="p">,</span>
<span class="n">url</span><span class="p">(</span><span class="s2">ur"^$"</span><span class="p">,</span>
<span class="n">ContextTemplateView</span><span class="o">.</span><span class="n">as_view</span><span class="p">(</span>
<span class="n">template_name</span><span class="o">=</span><span class="s2">u"index.html"</span><span class="p">,</span>
<span class="n">static_context</span><span class="o">=</span><span class="p">{</span><span class="s2">u"nav_home"</span><span class="p">:</span> <span class="kc">True</span><span class="p">}</span>
<span class="p">),</span>
<span class="n">name</span><span class="o">=</span><span class="s2">u"index"</span><span class="p">)</span>
<span class="p">)</span>
</pre></div>
</div>
</div>
</div>
<div class="section" id="selectrelatedmixin">
<span id="id3"></span><h2><a class="toc-backref" href="#id19">SelectRelatedMixin</a><a class="headerlink" href="#selectrelatedmixin" title="Permalink to this headline">¶</a></h2>
<p>A simple mixin which allows you to specify a list or tuple of foreign key fields to perform a <a class="reference external" href="https://docs.djangoproject.com/en/dev/ref/models/querysets/#select-related">select_related</a> on. See Django’s docs for more information on <a class="reference external" href="https://docs.djangoproject.com/en/dev/ref/models/querysets/#select-related">select_related</a>.</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="c1"># views.py</span>
<span class="kn">from</span> <span class="nn">django.views.generic</span> <span class="k">import</span> <span class="n">DetailView</span>
<span class="kn">from</span> <span class="nn">braces.views</span> <span class="k">import</span> <span class="n">SelectRelatedMixin</span>
<span class="kn">from</span> <span class="nn">profiles.models</span> <span class="k">import</span> <span class="n">Profile</span>
<span class="k">class</span> <span class="nc">UserProfileView</span><span class="p">(</span><span class="n">SelectRelatedMixin</span><span class="p">,</span> <span class="n">DetailView</span><span class="p">):</span>
<span class="n">model</span> <span class="o">=</span> <span class="n">Profile</span>
<span class="n">select_related</span> <span class="o">=</span> <span class="p">[</span><span class="s2">u"user"</span><span class="p">]</span>
<span class="n">template_name</span> <span class="o">=</span> <span class="s2">u"profiles/detail.html"</span>
</pre></div>
</div>
</div>
<div class="section" id="prefetchrelatedmixin">
<span id="id4"></span><h2><a class="toc-backref" href="#id20">PrefetchRelatedMixin</a><a class="headerlink" href="#prefetchrelatedmixin" title="Permalink to this headline">¶</a></h2>
<p>A simple mixin which allows you to specify a list or tuple of reverse foreign key or ManyToMany fields to perform a <a class="reference external" href="https://docs.djangoproject.com/en/dev/ref/models/querysets/#prefetch-related">prefetch_related</a> on. See Django’s docs for more information on <a class="reference external" href="https://docs.djangoproject.com/en/dev/ref/models/querysets/#prefetch-related">prefetch_related</a>.</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="c1"># views.py</span>
<span class="kn">from</span> <span class="nn">django.contrib.auth.models</span> <span class="k">import</span> <span class="n">User</span>
<span class="kn">from</span> <span class="nn">django.views.generic</span> <span class="k">import</span> <span class="n">DetailView</span>
<span class="kn">from</span> <span class="nn">braces.views</span> <span class="k">import</span> <span class="n">PrefetchRelatedMixin</span>
<span class="k">class</span> <span class="nc">UserView</span><span class="p">(</span><span class="n">PrefetchRelatedMixin</span><span class="p">,</span> <span class="n">DetailView</span><span class="p">):</span>
<span class="n">model</span> <span class="o">=</span> <span class="n">User</span>
<span class="n">prefetch_related</span> <span class="o">=</span> <span class="p">[</span><span class="s2">u"post_set"</span><span class="p">]</span> <span class="c1"># where the Post model has an FK to the User model as an author.</span>
<span class="n">template_name</span> <span class="o">=</span> <span class="s2">u"users/detail.html"</span>
</pre></div>
</div>
</div>
<div class="section" id="jsonresponsemixin">
<span id="id5"></span><h2><a class="toc-backref" href="#id21">JSONResponseMixin</a><a class="headerlink" href="#jsonresponsemixin" title="Permalink to this headline">¶</a></h2>
<div class="versionchanged">
<p><span class="versionmodified">Changed in version 1.1: </span><code class="docutils literal"><span class="pre">render_json_response</span></code> now accepts a <code class="docutils literal"><span class="pre">status</span></code> keyword argument.
<code class="docutils literal"><span class="pre">json_dumps_kwargs</span></code> class-attribute and <code class="docutils literal"><span class="pre">get_json_dumps_kwargs</span></code> method to provide arguments to the <code class="docutils literal"><span class="pre">json.dumps()</span></code> method.</p>
</div>
<p>A simple mixin to handle very simple serialization as a response to the browser.</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="c1"># views.py</span>
<span class="kn">from</span> <span class="nn">django.views.generic</span> <span class="k">import</span> <span class="n">DetailView</span>
<span class="kn">from</span> <span class="nn">braces.views</span> <span class="k">import</span> <span class="n">JSONResponseMixin</span>
<span class="k">class</span> <span class="nc">UserProfileAJAXView</span><span class="p">(</span><span class="n">JSONResponseMixin</span><span class="p">,</span> <span class="n">DetailView</span><span class="p">):</span>
<span class="n">model</span> <span class="o">=</span> <span class="n">Profile</span>
<span class="n">json_dumps_kwargs</span> <span class="o">=</span> <span class="p">{</span><span class="s2">u"indent"</span><span class="p">:</span> <span class="mi">2</span><span class="p">}</span>
<span class="k">def</span> <span class="nf">get</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">request</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="bp">self</span><span class="o">.</span><span class="n">object</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">get_object</span><span class="p">()</span>
<span class="n">context_dict</span> <span class="o">=</span> <span class="p">{</span>
<span class="s2">u"name"</span><span class="p">:</span> <span class="bp">self</span><span class="o">.</span><span class="n">object</span><span class="o">.</span><span class="n">user</span><span class="o">.</span><span class="n">name</span><span class="p">,</span>
<span class="s2">u"location"</span><span class="p">:</span> <span class="bp">self</span><span class="o">.</span><span class="n">object</span><span class="o">.</span><span class="n">location</span>
<span class="p">}</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">render_json_response</span><span class="p">(</span><span class="n">context_dict</span><span class="p">)</span>
</pre></div>
</div>
<p>You can additionally use the <cite>AjaxResponseMixin</cite></p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="c1"># views.py</span>
<span class="kn">from</span> <span class="nn">django.views</span> <span class="k">import</span> <span class="n">DetailView</span>
<span class="kn">from</span> <span class="nn">braces</span> <span class="k">import</span> <span class="n">views</span>
<span class="k">class</span> <span class="nc">UserProfileView</span><span class="p">(</span><span class="n">views</span><span class="o">.</span><span class="n">JSONResponseMixin</span><span class="p">,</span>
<span class="n">views</span><span class="o">.</span><span class="n">AjaxResponseMixin</span><span class="p">,</span>
<span class="n">DetailView</span><span class="p">):</span>
<span class="n">model</span> <span class="o">=</span> <span class="n">Profile</span>
<span class="k">def</span> <span class="nf">get_ajax</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">request</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="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">render_json_object_response</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">get_object</span><span class="p">())</span>
</pre></div>
</div>
<p>The <cite>JSONResponseMixin</cite> provides a class-level variable to control the response
type as well. By default it is <cite>application/json</cite>, but you can override that by
providing the <cite>content_type</cite> variable a different value or, programmatically, by
overriding the <cite>get_content_type()</cite> method.</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">django.views</span> <span class="k">import</span> <span class="n">DetailView</span>
<span class="kn">from</span> <span class="nn">braces.views</span> <span class="k">import</span> <span class="n">JSONResponseMixin</span>
<span class="k">class</span> <span class="nc">UserProfileAJAXView</span><span class="p">(</span><span class="n">JSONResponseMixin</span><span class="p">,</span> <span class="n">DetailView</span><span class="p">):</span>
<span class="n">content_type</span> <span class="o">=</span> <span class="s2">u"application/javascript"</span>
<span class="n">model</span> <span class="o">=</span> <span class="n">Profile</span>
<span class="k">def</span> <span class="nf">get</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">request</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="bp">self</span><span class="o">.</span><span class="n">object</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">get_object</span><span class="p">()</span>
<span class="n">context_dict</span> <span class="o">=</span> <span class="p">{</span>
<span class="s2">u"name"</span><span class="p">:</span> <span class="bp">self</span><span class="o">.</span><span class="n">object</span><span class="o">.</span><span class="n">user</span><span class="o">.</span><span class="n">name</span><span class="p">,</span>
<span class="s2">u"location"</span><span class="p">:</span> <span class="bp">self</span><span class="o">.</span><span class="n">object</span><span class="o">.</span><span class="n">location</span>
<span class="p">}</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">render_json_response</span><span class="p">(</span><span class="n">context_dict</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">get_content_type</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="c1"># Shown just for illustrative purposes</span>
<span class="k">return</span> <span class="s2">u"application/javascript"</span>
</pre></div>
</div>
<p>The <cite>JSONResponseMixin</cite> provides another class-level variable
<cite>json_encoder_class</cite> to use a custom json encoder with <cite>json.dumps</cite>.
By default it is <cite>django.core.serializers.json.DjangoJsonEncoder</cite></p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">django.core.serializers.json</span> <span class="k">import</span> <span class="n">DjangoJSONEncoder</span>
<span class="kn">from</span> <span class="nn">braces.views</span> <span class="k">import</span> <span class="n">JSONResponseMixin</span>
<span class="k">class</span> <span class="nc">SetJSONEncoder</span><span class="p">(</span><span class="n">DjangoJSONEncoder</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> A custom JSONEncoder extending `DjangoJSONEncoder` to handle serialization</span>
<span class="sd"> of `set`.</span>
<span class="sd"> """</span>
<span class="k">def</span> <span class="nf">default</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">obj</span><span class="p">):</span>
<span class="k">if</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">obj</span><span class="p">,</span> <span class="nb">set</span><span class="p">):</span>
<span class="k">return</span> <span class="nb">list</span><span class="p">(</span><span class="n">obj</span><span class="p">)</span>
<span class="k">return</span> <span class="nb">super</span><span class="p">(</span><span class="n">DjangoJSONEncoder</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">default</span><span class="p">(</span><span class="n">obj</span><span class="p">)</span>
<span class="k">class</span> <span class="nc">GetSetDataView</span><span class="p">(</span><span class="n">JSONResponseMixin</span><span class="p">,</span> <span class="n">View</span><span class="p">):</span>
<span class="n">json_encoder_class</span> <span class="o">=</span> <span class="n">SetJSONEncoder</span>
<span class="k">def</span> <span class="nf">get</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">request</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="n">numbers_set</span> <span class="o">=</span> <span class="nb">set</span><span class="p">(</span><span class="nb">range</span><span class="p">(</span><span class="mi">10</span><span class="p">))</span>
<span class="n">data</span> <span class="o">=</span> <span class="p">{</span><span class="s1">'numbers'</span><span class="p">:</span> <span class="n">numbers_set</span><span class="p">}</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">render_json_response</span><span class="p">(</span><span class="n">data</span><span class="p">)</span>
</pre></div>
</div>
</div>
<div class="section" id="jsonrequestresponsemixin">
<span id="id6"></span><h2><a class="toc-backref" href="#id22">JsonRequestResponseMixin</a><a class="headerlink" href="#jsonrequestresponsemixin" title="Permalink to this headline">¶</a></h2>
<div class="versionadded">
<p><span class="versionmodified">New in version 1.3.</span></p>
</div>
<p>A mixin that attempts to parse the request as JSON. If the request is properly formatted, the JSON is saved to <code class="docutils literal"><span class="pre">self.request_json</span></code> as a Python object. <code class="docutils literal"><span class="pre">request_json</span></code> will be <code class="docutils literal"><span class="pre">None</span></code> for imparsible requests.</p>
<p>To catch requests that aren’t JSON-formatted, set the class attribute <code class="docutils literal"><span class="pre">require_json</span></code> to <code class="docutils literal"><span class="pre">True</span></code>.</p>
<p>Override the class attribute <code class="docutils literal"><span class="pre">error_response_dict</span></code> to customize the default error message.</p>
<p>It extends <a class="reference internal" href="#jsonresponsemixin"><span class="std std-ref">JSONResponseMixin</span></a>, so those utilities are available as well.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">To allow public access to your view, you’ll need to use the <code class="docutils literal"><span class="pre">csrf_exempt</span></code> decorator or <a class="reference internal" href="form.html#csrfexemptmixin"><span class="std std-ref">CsrfExemptMixin</span></a>.</p>
</div>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">django.views.generic</span> <span class="k">import</span> <span class="n">View</span>
<span class="kn">from</span> <span class="nn">braces</span> <span class="k">import</span> <span class="n">views</span>
<span class="k">class</span> <span class="nc">SomeView</span><span class="p">(</span><span class="n">views</span><span class="o">.</span><span class="n">CsrfExemptMixin</span><span class="p">,</span> <span class="n">views</span><span class="o">.</span><span class="n">JsonRequestResponseMixin</span><span class="p">,</span> <span class="n">View</span><span class="p">):</span>
<span class="n">require_json</span> <span class="o">=</span> <span class="kc">True</span>
<span class="k">def</span> <span class="nf">post</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">request</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="k">try</span><span class="p">:</span>
<span class="n">burrito</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">request_json</span><span class="p">[</span><span class="s2">u"burrito"</span><span class="p">]</span>
<span class="n">toppings</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">request_json</span><span class="p">[</span><span class="s2">u"toppings"</span><span class="p">]</span>
<span class="k">except</span> <span class="ne">KeyError</span><span class="p">:</span>
<span class="n">error_dict</span> <span class="o">=</span> <span class="p">{</span><span class="s2">u"message"</span><span class="p">:</span>
<span class="s2">u"your order must include a burrito AND toppings"</span><span class="p">}</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">render_bad_request_response</span><span class="p">(</span><span class="n">error_dict</span><span class="p">)</span>
<span class="n">place_order</span><span class="p">(</span><span class="n">burrito</span><span class="p">,</span> <span class="n">toppings</span><span class="p">)</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">render_json_response</span><span class="p">(</span>
<span class="p">{</span><span class="s2">u"message"</span><span class="p">:</span> <span class="s2">u"Your order has been placed!"</span><span class="p">})</span>
</pre></div>
</div>
</div>
<div class="section" id="ajaxresponsemixin">
<span id="id7"></span><h2><a class="toc-backref" href="#id23">AjaxResponseMixin</a><a class="headerlink" href="#ajaxresponsemixin" title="Permalink to this headline">¶</a></h2>
<p>This mixin provides hooks for altenate processing of AJAX requests based on HTTP verb.</p>
<p>To control AJAX-specific behavior, override <code class="docutils literal"><span class="pre">get_ajax</span></code>, <code class="docutils literal"><span class="pre">post_ajax</span></code>, <code class="docutils literal"><span class="pre">put_ajax</span></code>, or <code class="docutils literal"><span class="pre">delete_ajax</span></code>. All four methods take <code class="docutils literal"><span class="pre">request</span></code>, <code class="docutils literal"><span class="pre">*args</span></code>, and <code class="docutils literal"><span class="pre">**kwargs</span></code> like the standard view methods.</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="c1"># views.py</span>
<span class="kn">from</span> <span class="nn">django.views.generic</span> <span class="k">import</span> <span class="n">View</span>
<span class="kn">from</span> <span class="nn">braces</span> <span class="k">import</span> <span class="n">views</span>
<span class="k">class</span> <span class="nc">SomeView</span><span class="p">(</span><span class="n">views</span><span class="o">.</span><span class="n">JSONResponseMixin</span><span class="p">,</span> <span class="n">views</span><span class="o">.</span><span class="n">AjaxResponseMixin</span><span class="p">,</span> <span class="n">View</span><span class="p">):</span>
<span class="k">def</span> <span class="nf">get_ajax</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">request</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="n">json_dict</span> <span class="o">=</span> <span class="p">{</span>
<span class="s1">'name'</span><span class="p">:</span> <span class="s2">"Benny's Burritos"</span><span class="p">,</span>
<span class="s1">'location'</span><span class="p">:</span> <span class="s2">"New York, NY"</span>
<span class="p">}</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">render_json_response</span><span class="p">(</span><span class="n">json_dict</span><span class="p">)</span>
</pre></div>
</div>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">This mixin is only useful if you need to have behavior in your view fork based on <code class="docutils literal"><span class="pre">request.is_ajax()</span></code>.</p>
</div>
</div>
<div class="section" id="orderablelistmixin">
<span id="id8"></span><h2><a class="toc-backref" href="#id24">OrderableListMixin</a><a class="headerlink" href="#orderablelistmixin" title="Permalink to this headline">¶</a></h2>
<div class="versionadded">
<p><span class="versionmodified">New in version 1.1.</span></p>
</div>
<p>A mixin to allow easy ordering of your queryset basing on the GET parameters. Works with <cite>ListView</cite>.</p>
<p>To use it, define columns that the data can be ordered by, as well as the default column to order by in your view. This can be done either by simply setting the class attributes:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="c1"># views.py</span>
<span class="kn">from</span> <span class="nn">django.views</span> <span class="k">import</span> <span class="n">ListView</span>
<span class="kn">from</span> <span class="nn">braces.views</span> <span class="k">import</span> <span class="n">OrderableListMixin</span>
<span class="k">class</span> <span class="nc">OrderableListView</span><span class="p">(</span><span class="n">OrderableListMixin</span><span class="p">,</span> <span class="n">ListView</span><span class="p">):</span>
<span class="n">model</span> <span class="o">=</span> <span class="n">Article</span>
<span class="n">orderable_columns</span> <span class="o">=</span> <span class="p">(</span><span class="s2">u"id"</span><span class="p">,</span> <span class="s2">u"title"</span><span class="p">,)</span>
<span class="n">orderable_columns_default</span> <span class="o">=</span> <span class="s2">u"id"</span>
</pre></div>
</div>
<p>Or by using similarly-named methods to set the ordering constraints more dynamically:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="c1"># views.py</span>
<span class="kn">from</span> <span class="nn">django.views</span> <span class="k">import</span> <span class="n">ListView</span>
<span class="kn">from</span> <span class="nn">braces.views</span> <span class="k">import</span> <span class="n">OrderableListMixin</span>
<span class="k">class</span> <span class="nc">OrderableListView</span><span class="p">(</span><span class="n">OrderableListMixin</span><span class="p">,</span> <span class="n">ListView</span><span class="p">):</span>
<span class="n">model</span> <span class="o">=</span> <span class="n">Article</span>
<span class="k">def</span> <span class="nf">get_orderable_columns</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="c1"># return an iterable</span>
<span class="k">return</span> <span class="p">(</span><span class="s2">u"id"</span><span class="p">,</span> <span class="s2">u"title"</span><span class="p">,)</span>
<span class="k">def</span> <span class="nf">get_orderable_columns_default</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="c1"># return a string</span>
<span class="k">return</span> <span class="s2">u"id"</span>
</pre></div>
</div>
<p>The <code class="docutils literal"><span class="pre">orderable_columns</span></code> restriction is here in order to stop your users from launching inefficient queries, like ordering by binary columns.</p>
<p><code class="docutils literal"><span class="pre">OrderableListMixin</span></code> will order your queryset basing on following GET params:</p>
<blockquote>
<div><ul class="simple">
<li><code class="docutils literal"><span class="pre">order_by</span></code>: column name, e.g. <code class="docutils literal"><span class="pre">"title"</span></code></li>
<li><code class="docutils literal"><span class="pre">ordering</span></code>: <code class="docutils literal"><span class="pre">"asc"</span></code> (default) or <code class="docutils literal"><span class="pre">"desc"</span></code></li>
</ul>
</div></blockquote>
<p>Example url: <cite>http://127.0.0.1:8000/articles/?order_by=title&ordering=asc</cite></p>
<p><strong>Front-end Example Usage</strong></p>
<p>If you’re using bootstrap you could create a template like the following:</p>
<div class="code html highlight-default"><div class="highlight"><pre><span></span><div class="table-responsive">
<table class="table table-striped table-bordered">
<tr>
<th><a class="order-by-column" data-column="id" href="#">ID</a></th>
<th><a class="order-by-column" data-column="title" href="#">Title</a></th>
</tr>
{% for object in object_list %}
<tr>
<td>{{ object.id }}</td>
<td>{{ object.title }}</td>
</tr>
{% endfor %}
</table>
</div>
<script>
function setupOrderedColumns(order_by, orderin) {
$('.order-by-column').each(function() {
var $el = $(this),
column_name = $el.data('column'),
href = location.href,
next_order = 'asc',
has_query_string = (href.indexOf('?') !== -1),
order_by_param,
ordering_param;
if (order_by === column_name) {
$el.addClass('current');
$el.addClass(ordering);
$el.append('<span class="caret"></span>');
if (ordering === 'asc') {
$el.addClass('dropup');
next_order = 'desc';
}
}
order_by_param = "order_by=" + column_name;
ordering_param = "ordering=" + next_order;
if (!has_query_string) {
href = '?' + order_by_param + '&' + ordering_param;
} else {
if (href.match(/ordering=(asc|desc)/)) {
href = href.replace(/ordering=(asc|desc)/, ordering_param);
} else {
href += '&' + ordering_param;
}
if (href.match(/order_by=[_\w]+/)) {
href = href.replace(/order_by=([_\w]+)/, order_by_param);
} else {
href += '&' + order_by_param;
}
}
$el.attr('href', href);
});
}
setupOrderedColumns('{{ order_by }}', '{{ ordering }}');
</script>
</pre></div>
</div>
</div>
<div class="section" id="canonicalslugdetailmixin">
<span id="id9"></span><h2><a class="toc-backref" href="#id25">CanonicalSlugDetailMixin</a><a class="headerlink" href="#canonicalslugdetailmixin" title="Permalink to this headline">¶</a></h2>
<div class="versionadded">
<p><span class="versionmodified">New in version 1.3.</span></p>
</div>
<p>A mixin that enforces a canonical slug in the URL. Works with <code class="docutils literal"><span class="pre">DetailView</span></code>.</p>
<p>If a <code class="docutils literal"><span class="pre">urlpattern</span></code> takes a object’s <code class="docutils literal"><span class="pre">pk</span></code> and <code class="docutils literal"><span class="pre">slug</span></code> as arguments and the <code class="docutils literal"><span class="pre">slug</span></code> URL argument does not equal the object’s canonical slug, this mixin will redirect to the URL containing the canonical slug.</p>
<p>To use it, the <code class="docutils literal"><span class="pre">urlpattern</span></code> must accept both a <code class="docutils literal"><span class="pre">pk</span></code> and <code class="docutils literal"><span class="pre">slug</span></code> argument in its regex:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="c1"># urls.py</span>
<span class="n">urlpatterns</span> <span class="o">=</span> <span class="n">patterns</span><span class="p">(</span><span class="s1">''</span><span class="p">,</span>
<span class="n">url</span><span class="p">(</span><span class="s2">r"^article/(?P<pk>\d+)-(?P<slug>[-\w]+)$"</span><span class="p">)</span>
<span class="n">ArticleView</span><span class="o">.</span><span class="n">as_view</span><span class="p">(),</span>
<span class="s2">"view_article"</span>
<span class="p">)</span>
</pre></div>
</div>
<p>Then create a standard <code class="docutils literal"><span class="pre">DetailView</span></code> that inherits this mixin:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="k">class</span> <span class="nc">ArticleView</span><span class="p">(</span><span class="n">CanonicalSlugDetailMixin</span><span class="p">,</span> <span class="n">DetailView</span><span class="p">):</span>
<span class="n">model</span> <span class="o">=</span> <span class="n">Article</span>
</pre></div>
</div>
<p>Now, given an <code class="docutils literal"><span class="pre">Article</span></code> object with <code class="docutils literal"><span class="pre">{pk:</span> <span class="pre">1,</span> <span class="pre">slug:</span> <span class="pre">'hello-world'}</span></code>, the URL <cite>http://127.0.0.1:8000/article/1-goodbye-moon</cite> will redirect to <cite>http://127.0.0.1:8000/article/1-hello-world</cite> with the HTTP status code 301 Moved Permanently. Any other non-canonical slug, not just ‘goodbye-moon’, will trigger the redirect as well.</p>
<p>Control the canonical slug by either implementing the method <code class="docutils literal"><span class="pre">get_canonical_slug()</span></code> on the model class:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="k">class</span> <span class="nc">Article</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">blog</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="s1">'Blog'</span><span class="p">)</span>
<span class="n">slug</span> <span class="o">=</span> <span class="n">models</span><span class="o">.</span><span class="n">SlugField</span><span class="p">()</span>
<span class="k">def</span> <span class="nf">get_canonical_slug</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="s2">"</span><span class="si">{0}</span><span class="s2">-</span><span class="si">{1}</span><span class="s2">"</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">blog</span><span class="o">.</span><span class="n">get_canonical_slug</span><span class="p">(),</span> <span class="bp">self</span><span class="o">.</span><span class="n">slug</span><span class="p">)</span>
</pre></div>
</div>
<p>Or by overriding the <code class="docutils literal"><span class="pre">get_canonical_slug()</span></code> method on the view:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="k">class</span> <span class="nc">ArticleView</span><span class="p">(</span><span class="n">CanonicalSlugDetailMixin</span><span class="p">,</span> <span class="n">DetailView</span><span class="p">):</span>
<span class="n">model</span> <span class="o">=</span> <span class="n">Article</span>
<span class="k">def</span> <span class="nf">get_canonical_slug</span><span class="p">():</span>
<span class="kn">import</span> <span class="nn">codecs</span>
<span class="k">return</span> <span class="n">codecs</span><span class="o">.</span><span class="n">encode</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">get_object</span><span class="p">()</span><span class="o">.</span><span class="n">slug</span><span class="p">,</span> <span class="s2">"rot_13"</span><span class="p">)</span>
</pre></div>
</div>
<p>Given the same Article as before, this will generate urls of <cite>http://127.0.0.1:8000/article/1-my-blog-hello-world</cite> and <cite>http://127.0.0.1:8000/article/1-uryyb-jbeyq</cite>, respectively.</p>
</div>
<div class="section" id="messagemixin">
<span id="id10"></span><h2><a class="toc-backref" href="#id26">MessageMixin</a><a class="headerlink" href="#messagemixin" title="Permalink to this headline">¶</a></h2>
<div class="versionadded">
<p><span class="versionmodified">New in version 1.4.</span></p>
</div>
<p>A mixin that adds a <code class="docutils literal"><span class="pre">messages</span></code> attribute on the view which acts as a wrapper
to <code class="docutils literal"><span class="pre">django.contrib.messages</span></code> and passes the <code class="docutils literal"><span class="pre">request</span></code> object automatically.</p>
<blockquote>
<div><div class="admonition warning">
<p class="first admonition-title">Warning</p>
<p class="last">If you’re using Django 1.4, then the <code class="docutils literal"><span class="pre">message</span></code> attribute is only
available after the base view’s <code class="docutils literal"><span class="pre">dispatch</span></code> method has been called
(so our second example would not work for instance).</p>
</div>
</div></blockquote>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">django.views.generic</span> <span class="k">import</span> <span class="n">TemplateView</span>
<span class="kn">from</span> <span class="nn">braces.views</span> <span class="k">import</span> <span class="n">MessageMixin</span>
<span class="k">class</span> <span class="nc">MyView</span><span class="p">(</span><span class="n">MessageMixin</span><span class="p">,</span> <span class="n">TemplateView</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> This view will add a debug message which can then be displayed</span>
<span class="sd"> in the template.</span>
<span class="sd"> """</span>
<span class="n">template_name</span> <span class="o">=</span> <span class="s2">"my_template.html"</span>
<span class="k">def</span> <span class="nf">get</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">request</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="bp">self</span><span class="o">.</span><span class="n">messages</span><span class="o">.</span><span class="n">debug</span><span class="p">(</span><span class="s2">"This is a debug message."</span><span class="p">)</span>
<span class="k">return</span> <span class="nb">super</span><span class="p">(</span><span class="n">MyView</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">request</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>
</pre></div>
</div>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">django.contrib</span> <span class="k">import</span> <span class="n">messages</span>
<span class="kn">from</span> <span class="nn">django.views.generic</span> <span class="k">import</span> <span class="n">TemplateView</span>
<span class="kn">from</span> <span class="nn">braces.views</span> <span class="k">import</span> <span class="n">MessageMixin</span>
<span class="k">class</span> <span class="nc">OnlyWarningView</span><span class="p">(</span><span class="n">MessageMixin</span><span class="p">,</span> <span class="n">TemplateView</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> This view will only show messages that have a level</span>
<span class="sd"> above `warning`.</span>
<span class="sd"> """</span>
<span class="n">template_name</span> <span class="o">=</span> <span class="s2">"my_template.html"</span>
<span class="k">def</span> <span class="nf">dispatch</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">request</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="bp">self</span><span class="o">.</span><span class="n">messages</span><span class="o">.</span><span class="n">set_level</span><span class="p">(</span><span class="n">messages</span><span class="o">.</span><span class="n">WARNING</span><span class="p">)</span>
<span class="k">return</span> <span class="nb">super</span><span class="p">(</span><span class="n">OnlyWarningView</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">dispatch</span><span class="p">(</span><span class="n">request</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>
</pre></div>
</div>
</div>
<div class="section" id="allverbsmixin">
<span id="id11"></span><h2><a class="toc-backref" href="#id27">AllVerbsMixin</a><a class="headerlink" href="#allverbsmixin" title="Permalink to this headline">¶</a></h2>
<div class="versionadded">
<p><span class="versionmodified">New in version 1.4.</span></p>
</div>
<p>This mixin allows you to specify a single method that will response to all HTTP verbs, making a class-based view behave much like a function-based view.</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">django.views</span> <span class="k">import</span> <span class="n">TemplateView</span>
<span class="kn">from</span> <span class="nn">braces.views</span> <span class="k">import</span> <span class="n">AllVerbsMixin</span>
<span class="k">class</span> <span class="nc">JustShowItView</span><span class="p">(</span><span class="n">AllVerbsMixin</span><span class="p">,</span> <span class="n">TemplateView</span><span class="p">):</span>
<span class="n">template_name</span> <span class="o">=</span> <span class="s2">"just/show_it.html"</span>
<span class="k">def</span> <span class="nf">all</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">request</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="k">return</span> <span class="nb">super</span><span class="p">(</span><span class="n">JustShowItView</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">request</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>
</pre></div>
</div>
<p>If you need to change the name of the method called, provide a new value to the <code class="docutils literal"><span class="pre">all_handler</span></code> attribute (default is <code class="docutils literal"><span class="pre">'all'</span></code>)</p>
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<ul>
<li><a class="reference internal" href="#">Other Mixins</a><ul>
<li><a class="reference internal" href="#setheadlinemixin">SetHeadlineMixin</a><ul>
<li><a class="reference internal" href="#static-example">Static Example</a></li>
<li><a class="reference internal" href="#dynamic-example">Dynamic Example</a></li>
</ul>
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<li><a class="reference internal" href="#staticcontextmixin">StaticContextMixin</a><ul>
<li><a class="reference internal" href="#view-example">View Example</a></li>
<li><a class="reference internal" href="#url-example">URL Example</a></li>
</ul>
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<li><a class="reference internal" href="#selectrelatedmixin">SelectRelatedMixin</a></li>
<li><a class="reference internal" href="#prefetchrelatedmixin">PrefetchRelatedMixin</a></li>
<li><a class="reference internal" href="#jsonresponsemixin">JSONResponseMixin</a></li>
<li><a class="reference internal" href="#jsonrequestresponsemixin">JsonRequestResponseMixin</a></li>
<li><a class="reference internal" href="#ajaxresponsemixin">AjaxResponseMixin</a></li>
<li><a class="reference internal" href="#orderablelistmixin">OrderableListMixin</a></li>
<li><a class="reference internal" href="#canonicalslugdetailmixin">CanonicalSlugDetailMixin</a></li>
<li><a class="reference internal" href="#messagemixin">MessageMixin</a></li>
<li><a class="reference internal" href="#allverbsmixin">AllVerbsMixin</a></li>
</ul>
</li>
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