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  <div class="section" id="s-migrating-function-based-generic-views">
<span id="migrating-function-based-generic-views"></span><h1>Migrating function-based generic views<a class="headerlink" href="#migrating-function-based-generic-views" title="Permalink to this headline">¶</a></h1>
<p>All the <a class="reference internal" href="../ref/generic-views.html"><em>function-based generic views</em></a>
that existed in Django 1.2 have analogs as <a class="reference internal" href="../ref/class-based-views.html"><em>class-based generic
views</em></a> in Django 1.3. The feature set
exposed in those function-based views can be replicated in a
class-based way.</p>
<div class="section" id="s-how-to-migrate">
<span id="how-to-migrate"></span><h2>How to migrate<a class="headerlink" href="#how-to-migrate" title="Permalink to this headline">¶</a></h2>
<div class="section" id="s-replace-generic-views-with-generic-classes">
<span id="replace-generic-views-with-generic-classes"></span><h3>Replace generic views with generic classes<a class="headerlink" href="#replace-generic-views-with-generic-classes" title="Permalink to this headline">¶</a></h3>
<p>Existing usage of function-based generic views should be replaced with
their class-based analogs:</p>
<table class="docutils">
<colgroup>
<col width="50%" />
<col width="50%" />
</colgroup>
<thead valign="bottom">
<tr class="row-odd"><th class="head">Old function-based generic view</th>
<th class="head">New class-based generic view</th>
</tr>
</thead>
<tbody valign="top">
<tr class="row-even"><td><tt class="docutils literal"><span class="pre">django.views.generic.simple.direct_to_template</span></tt></td>
<td><a class="reference internal" href="../ref/class-based-views.html#django.views.generic.base.TemplateView" title="django.views.generic.base.TemplateView"><tt class="xref py py-class docutils literal"><span class="pre">django.views.generic.base.TemplateView</span></tt></a></td>
</tr>
<tr class="row-odd"><td><tt class="docutils literal"><span class="pre">django.views.generic.simple.redirect_to</span></tt></td>
<td><a class="reference internal" href="../ref/class-based-views.html#django.views.generic.base.RedirectView" title="django.views.generic.base.RedirectView"><tt class="xref py py-class docutils literal"><span class="pre">django.views.generic.base.RedirectView</span></tt></a></td>
</tr>
<tr class="row-even"><td><tt class="docutils literal"><span class="pre">django.views.generic.list_detail.object_list</span></tt></td>
<td><a class="reference internal" href="../ref/class-based-views.html#django.views.generic.list.ListView" title="django.views.generic.list.ListView"><tt class="xref py py-class docutils literal"><span class="pre">django.views.generic.list.ListView</span></tt></a></td>
</tr>
<tr class="row-odd"><td><tt class="docutils literal"><span class="pre">django.views.generic.list_detail.object_detail</span></tt></td>
<td><a class="reference internal" href="../ref/class-based-views.html#django.views.generic.detail.DetailView" title="django.views.generic.detail.DetailView"><tt class="xref py py-class docutils literal"><span class="pre">django.views.generic.detail.DetailView</span></tt></a></td>
</tr>
<tr class="row-even"><td><tt class="docutils literal"><span class="pre">django.views.generic.create_update.create_object</span></tt></td>
<td><a class="reference internal" href="../ref/class-based-views.html#django.views.generic.edit.CreateView" title="django.views.generic.edit.CreateView"><tt class="xref py py-class docutils literal"><span class="pre">django.views.generic.edit.CreateView</span></tt></a></td>
</tr>
<tr class="row-odd"><td><tt class="docutils literal"><span class="pre">django.views.generic.create_update.update_object</span></tt></td>
<td><a class="reference internal" href="../ref/class-based-views.html#django.views.generic.edit.UpdateView" title="django.views.generic.edit.UpdateView"><tt class="xref py py-class docutils literal"><span class="pre">django.views.generic.edit.UpdateView</span></tt></a></td>
</tr>
<tr class="row-even"><td><tt class="docutils literal"><span class="pre">django.views.generic.create_update.delete_object</span></tt></td>
<td><a class="reference internal" href="../ref/class-based-views.html#django.views.generic.edit.DeleteView" title="django.views.generic.edit.DeleteView"><tt class="xref py py-class docutils literal"><span class="pre">django.views.generic.edit.DeleteView</span></tt></a></td>
</tr>
<tr class="row-odd"><td><tt class="docutils literal"><span class="pre">django.views.generic.date_based.archive_index</span></tt></td>
<td><a class="reference internal" href="../ref/class-based-views.html#django.views.generic.dates.ArchiveIndexView" title="django.views.generic.dates.ArchiveIndexView"><tt class="xref py py-class docutils literal"><span class="pre">django.views.generic.dates.ArchiveIndexView</span></tt></a></td>
</tr>
<tr class="row-even"><td><tt class="docutils literal"><span class="pre">django.views.generic.date_based.archive_year</span></tt></td>
<td><a class="reference internal" href="../ref/class-based-views.html#django.views.generic.dates.YearArchiveView" title="django.views.generic.dates.YearArchiveView"><tt class="xref py py-class docutils literal"><span class="pre">django.views.generic.dates.YearArchiveView</span></tt></a></td>
</tr>
<tr class="row-odd"><td><tt class="docutils literal"><span class="pre">django.views.generic.date_based.archive_month</span></tt></td>
<td><a class="reference internal" href="../ref/class-based-views.html#django.views.generic.dates.MonthArchiveView" title="django.views.generic.dates.MonthArchiveView"><tt class="xref py py-class docutils literal"><span class="pre">django.views.generic.dates.MonthArchiveView</span></tt></a></td>
</tr>
<tr class="row-even"><td><tt class="docutils literal"><span class="pre">django.views.generic.date_based.archive_week</span></tt></td>
<td><a class="reference internal" href="../ref/class-based-views.html#django.views.generic.dates.WeekArchiveView" title="django.views.generic.dates.WeekArchiveView"><tt class="xref py py-class docutils literal"><span class="pre">django.views.generic.dates.WeekArchiveView</span></tt></a></td>
</tr>
<tr class="row-odd"><td><tt class="docutils literal"><span class="pre">django.views.generic.date_based.archive_day</span></tt></td>
<td><a class="reference internal" href="../ref/class-based-views.html#django.views.generic.dates.DayArchiveView" title="django.views.generic.dates.DayArchiveView"><tt class="xref py py-class docutils literal"><span class="pre">django.views.generic.dates.DayArchiveView</span></tt></a></td>
</tr>
<tr class="row-even"><td><tt class="docutils literal"><span class="pre">django.views.generic.date_based.archive_today</span></tt></td>
<td><a class="reference internal" href="../ref/class-based-views.html#django.views.generic.dates.TodayArchiveView" title="django.views.generic.dates.TodayArchiveView"><tt class="xref py py-class docutils literal"><span class="pre">django.views.generic.dates.TodayArchiveView</span></tt></a></td>
</tr>
<tr class="row-odd"><td><tt class="docutils literal"><span class="pre">django.views.generic.date_based.object_detail</span></tt></td>
<td><a class="reference internal" href="../ref/class-based-views.html#django.views.generic.dates.DateDetailView" title="django.views.generic.dates.DateDetailView"><tt class="xref py py-class docutils literal"><span class="pre">django.views.generic.dates.DateDetailView</span></tt></a></td>
</tr>
</tbody>
</table>
<p>To do this, replace the reference to the generic view function with
a <tt class="docutils literal"><span class="pre">as_view()</span></tt> instantiation of the class-based view. For example,
the old-style <tt class="docutils literal"><span class="pre">direct_to_template</span></tt> pattern:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="p">(</span><span class="s">&#39;^about/$&#39;</span><span class="p">,</span> <span class="n">direct_to_template</span><span class="p">,</span> <span class="p">{</span><span class="s">&#39;template&#39;</span><span class="p">:</span> <span class="s">&#39;about.html&#39;</span><span class="p">})</span>
</pre></div>
</div>
<p>can be replaced with an instance of
<a class="reference internal" href="../ref/class-based-views.html#django.views.generic.base.TemplateView" title="django.views.generic.base.TemplateView"><tt class="xref py py-class docutils literal"><span class="pre">TemplateView</span></tt></a>:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="p">(</span><span class="s">&#39;^about/$&#39;</span><span class="p">,</span> <span class="n">TemplateView</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="s">&#39;about.html&#39;</span><span class="p">))</span>
</pre></div>
</div>
</div>
<div class="section" id="s-template-argument-to-direct-to-template-views">
<span id="template-argument-to-direct-to-template-views"></span><h3><tt class="docutils literal"><span class="pre">template</span></tt> argument to <tt class="docutils literal"><span class="pre">direct_to_template</span></tt> views<a class="headerlink" href="#template-argument-to-direct-to-template-views" title="Permalink to this headline">¶</a></h3>
<p>The <tt class="docutils literal"><span class="pre">template</span></tt> argument to the <tt class="docutils literal"><span class="pre">direct_to_template</span></tt> view has been renamed
<tt class="docutils literal"><span class="pre">template_name</span></tt>. This has been done to maintain consistency with other views.</p>
</div>
<div class="section" id="s-object-id-argument-to-detail-views">
<span id="object-id-argument-to-detail-views"></span><h3><tt class="docutils literal"><span class="pre">object_id</span></tt> argument to detail views<a class="headerlink" href="#object-id-argument-to-detail-views" title="Permalink to this headline">¶</a></h3>
<p>The object_id argument to the <tt class="docutils literal"><span class="pre">object_detail</span></tt> view has been renamed
<tt class="docutils literal"><span class="pre">pk</span></tt> on the <a class="reference internal" href="../ref/class-based-views.html#django.views.generic.detail.DetailView" title="django.views.generic.detail.DetailView"><tt class="xref py py-class docutils literal"><span class="pre">DetailView</span></tt></a>.</p>
</div>
<div class="section" id="s-template-object-name">
<span id="template-object-name"></span><h3><tt class="docutils literal"><span class="pre">template_object_name</span></tt><a class="headerlink" href="#template-object-name" title="Permalink to this headline">¶</a></h3>
<p><tt class="docutils literal"><span class="pre">template_object_name</span></tt> has been renamed <tt class="docutils literal"><span class="pre">context_object_name</span></tt>,
reflecting the fact that the context data can be used for purposes
other than template rendering (e.g., to populate JSON output).</p>
</div>
<div class="section" id="s-the-list-suffix-on-list-views">
<span id="the-list-suffix-on-list-views"></span><h3>The <tt class="docutils literal"><span class="pre">_list</span></tt> suffix on list views<a class="headerlink" href="#the-list-suffix-on-list-views" title="Permalink to this headline">¶</a></h3>
<p>In a function-based <tt class="xref py py-class docutils literal"><span class="pre">ListView</span></tt>, the <tt class="docutils literal"><span class="pre">template_object_name</span></tt>
was appended with the suffix <tt class="docutils literal"><span class="pre">'_list'</span></tt> to yield the final context
variable name. In a class-based <tt class="docutils literal"><span class="pre">ListView</span></tt>, the
<tt class="docutils literal"><span class="pre">context_object_name</span></tt> is used verbatim. The <tt class="docutils literal"><span class="pre">'_list'</span></tt> suffix
is only applied when generating a default context object name.</p>
</div>
<div class="section" id="s-the-context-data-for-object-list-views">
<span id="the-context-data-for-object-list-views"></span><h3>The context data for <tt class="docutils literal"><span class="pre">object_list</span></tt> views<a class="headerlink" href="#the-context-data-for-object-list-views" title="Permalink to this headline">¶</a></h3>
<p>The context provided by <a class="reference internal" href="../ref/class-based-views.html#django.views.generic.list.MultipleObjectMixin" title="django.views.generic.list.MultipleObjectMixin"><tt class="xref py py-class docutils literal"><span class="pre">MultipleObjectMixin</span></tt></a>
is quite different from that provided by <tt class="docutils literal"><span class="pre">object_list</span></tt>, with most pagination
related variables replaced by a single <tt class="docutils literal"><span class="pre">page_obj</span></tt> object. The following are no
longer provided:</p>
<ul class="simple">
<li><tt class="docutils literal"><span class="pre">first_on_page</span></tt></li>
<li><tt class="docutils literal"><span class="pre">has_next</span></tt></li>
<li><tt class="docutils literal"><span class="pre">has_previous</span></tt></li>
<li><tt class="docutils literal"><span class="pre">hits</span></tt></li>
<li><tt class="docutils literal"><span class="pre">last_on_page</span></tt></li>
<li><tt class="docutils literal"><span class="pre">next</span></tt></li>
<li><tt class="docutils literal"><span class="pre">page_range</span></tt></li>
<li><tt class="docutils literal"><span class="pre">page</span></tt></li>
<li><tt class="docutils literal"><span class="pre">pages</span></tt></li>
<li><tt class="docutils literal"><span class="pre">previous</span></tt></li>
<li><tt class="docutils literal"><span class="pre">results_per_page</span></tt></li>
</ul>
</div>
<div class="section" id="s-extra-context">
<span id="extra-context"></span><h3><tt class="docutils literal"><span class="pre">extra_context</span></tt><a class="headerlink" href="#extra-context" title="Permalink to this headline">¶</a></h3>
<p>Function-based generic views provided an <tt class="docutils literal"><span class="pre">extra_context</span></tt> argument
as way to insert extra items into the context at time of rendering.</p>
<p>Class-based views don&#8217;t provide an <tt class="docutils literal"><span class="pre">extra_context</span></tt> argument.
Instead, you subclass the view, overriding <tt class="xref py py-meth docutils literal"><span class="pre">get_context_data()</span></tt>.
For example:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="k">class</span> <span class="nc">MyListView</span><span class="p">(</span><span class="n">ListView</span><span class="p">):</span>
    <span class="k">def</span> <span class="nf">get_context_data</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">**</span><span class="n">kwargs</span><span class="p">):</span>
        <span class="n">context</span> <span class="o">=</span> <span class="nb">super</span><span class="p">(</span><span class="n">MyListView</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">get_context_data</span><span class="p">(</span><span class="o">**</span><span class="n">kwargs</span><span class="p">)</span>
        <span class="n">context</span><span class="o">.</span><span class="n">update</span><span class="p">({</span>
            <span class="s">&#39;foo&#39;</span><span class="p">:</span> <span class="mi">42</span><span class="p">,</span>
            <span class="s">&#39;bar&#39;</span><span class="p">:</span> <span class="mi">37</span>
        <span class="p">})</span>
        <span class="k">return</span> <span class="n">context</span>
</pre></div>
</div>
</div>
<div class="section" id="s-post-save-redirect-argument-to-create-and-update-views">
<span id="post-save-redirect-argument-to-create-and-update-views"></span><h3><tt class="docutils literal"><span class="pre">post_save_redirect</span></tt> argument to create and update views<a class="headerlink" href="#post-save-redirect-argument-to-create-and-update-views" title="Permalink to this headline">¶</a></h3>
<p>The <tt class="docutils literal"><span class="pre">post_save_redirect</span></tt> argument to the create and update views
has been renamed <tt class="docutils literal"><span class="pre">success_url</span></tt> on the
<a class="reference internal" href="../ref/class-based-views.html#django.views.generic.edit.ModelFormMixin" title="django.views.generic.edit.ModelFormMixin"><tt class="xref py py-class docutils literal"><span class="pre">ModelFormMixin</span></tt></a>.</p>
</div>
<div class="section" id="s-mimetype">
<span id="mimetype"></span><h3><tt class="docutils literal"><span class="pre">mimetype</span></tt><a class="headerlink" href="#mimetype" title="Permalink to this headline">¶</a></h3>
<p>Some function-based generic views provided a <tt class="docutils literal"><span class="pre">mimetype</span></tt> argument
as way to control the mimetype of the response.</p>
<p>Class-based views don&#8217;t provide a <tt class="docutils literal"><span class="pre">mimetype</span></tt> argument. Instead, you
subclass the view, overriding
<tt class="xref py py-meth docutils literal"><span class="pre">TemplateResponseMixin.render_to_response()</span></tt> and pass in arguments for
the TemplateResponse constructor. For example:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="k">class</span> <span class="nc">MyListView</span><span class="p">(</span><span class="n">ListView</span><span class="p">):</span>
    <span class="k">def</span> <span class="nf">render_to_response</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">context</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">MyListView</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">render_to_response</span><span class="p">(</span><span class="n">context</span><span class="p">,</span>
                        <span class="n">content_type</span><span class="o">=</span><span class="s">&#39;application/json&#39;</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="s-context-processors">
<span id="context-processors"></span><h3><tt class="docutils literal"><span class="pre">context_processors</span></tt><a class="headerlink" href="#context-processors" title="Permalink to this headline">¶</a></h3>
<p>Some function-based generic views provided a <tt class="docutils literal"><span class="pre">context_processors</span></tt>
argument that could be used to force the use of specialized context
processors when rendering template content.</p>
<p>Class-based views don&#8217;t provide a <tt class="docutils literal"><span class="pre">context_processors</span></tt> argument.
Instead, you subclass the view, overriding
<tt class="xref py py-meth docutils literal"><span class="pre">TemplateResponseMixin.render_to_response()</span></tt>, and passing in
a context instance that has been instantiated with the processors
you want to use. For example:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="k">class</span> <span class="nc">MyListView</span><span class="p">(</span><span class="n">ListView</span><span class="p">):</span>
    <span class="k">def</span> <span class="nf">render_to_response</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">context</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">MyListView</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">render_to_response</span><span class="p">(</span>
                <span class="n">RequestContext</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">request</span><span class="p">,</span>
                               <span class="n">context</span><span class="p">,</span>
                               <span class="n">processors</span><span class="o">=</span><span class="p">[</span><span class="n">custom_processor</span><span class="p">]),</span>
                <span class="o">**</span><span class="n">kwargs</span><span class="p">)</span>
</pre></div>
</div>
</div>
</div>
</div>


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  <h3><a href="../contents.html">Table Of Contents</a></h3>
  <ul>
<li><a class="reference internal" href="#">Migrating function-based generic views</a><ul>
<li><a class="reference internal" href="#how-to-migrate">How to migrate</a><ul>
<li><a class="reference internal" href="#replace-generic-views-with-generic-classes">Replace generic views with generic classes</a></li>
<li><a class="reference internal" href="#template-argument-to-direct-to-template-views"><tt class="docutils literal"><span class="pre">template</span></tt> argument to <tt class="docutils literal"><span class="pre">direct_to_template</span></tt> views</a></li>
<li><a class="reference internal" href="#object-id-argument-to-detail-views"><tt class="docutils literal"><span class="pre">object_id</span></tt> argument to detail views</a></li>
<li><a class="reference internal" href="#template-object-name"><tt class="docutils literal"><span class="pre">template_object_name</span></tt></a></li>
<li><a class="reference internal" href="#the-list-suffix-on-list-views">The <tt class="docutils literal"><span class="pre">_list</span></tt> suffix on list views</a></li>
<li><a class="reference internal" href="#the-context-data-for-object-list-views">The context data for <tt class="docutils literal"><span class="pre">object_list</span></tt> views</a></li>
<li><a class="reference internal" href="#extra-context"><tt class="docutils literal"><span class="pre">extra_context</span></tt></a></li>
<li><a class="reference internal" href="#post-save-redirect-argument-to-create-and-update-views"><tt class="docutils literal"><span class="pre">post_save_redirect</span></tt> argument to create and update views</a></li>
<li><a class="reference internal" href="#mimetype"><tt class="docutils literal"><span class="pre">mimetype</span></tt></a></li>
<li><a class="reference internal" href="#context-processors"><tt class="docutils literal"><span class="pre">context_processors</span></tt></a></li>
</ul>
</li>
</ul>
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