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<div class="yui-g" id="ref-class-based-views-base">
<div class="section" id="s-base-views">
<span id="base-views"></span><h1>Base views<a class="headerlink" href="#base-views" title="Permalink to this headline">¶</a></h1>
<p>The following three classes provide much of the functionality needed to create
Django views. You may think of them as <em>parent</em> views, which can be used by
themselves or inherited from. They may not provide all the capabilities
required for projects, in which case there are Mixins and Generic class-based
views.</p>
<p>Many of Django’s built-in class-based views inherit from other class-based
views or various mixins. Because this inheritance chain is very important, the
ancestor classes are documented under the section title of <strong>Ancestors (MRO)</strong>.
MRO is an acronym for Method Resolution Order.</p>
<div class="section" id="s-view">
<span id="view"></span><h2>View<a class="headerlink" href="#view" title="Permalink to this headline">¶</a></h2>
<dl class="class">
<dt id="django.views.generic.base.View">
<em class="property">class </em><tt class="descclassname">django.views.generic.base.</tt><tt class="descname">View</tt><a class="headerlink" href="#django.views.generic.base.View" title="Permalink to this definition">¶</a></dt>
<dd><p>The master class-based base view. All other class-based views inherit from
this base class.</p>
<p><strong>Method Flowchart</strong></p>
<ol class="arabic simple">
<li><a class="reference internal" href="#django.views.generic.base.View.dispatch" title="django.views.generic.base.View.dispatch"><tt class="xref py py-meth docutils literal"><span class="pre">dispatch()</span></tt></a></li>
<li><a class="reference internal" href="#django.views.generic.base.View.http_method_not_allowed" title="django.views.generic.base.View.http_method_not_allowed"><tt class="xref py py-meth docutils literal"><span class="pre">http_method_not_allowed()</span></tt></a></li>
<li><a class="reference internal" href="#django.views.generic.base.View.options" title="django.views.generic.base.View.options"><tt class="xref py py-meth docutils literal"><span class="pre">options()</span></tt></a></li>
</ol>
<p><strong>Example views.py</strong>:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">django.http</span> <span class="kn">import</span> <span class="n">HttpResponse</span>
<span class="kn">from</span> <span class="nn">django.views.generic</span> <span class="kn">import</span> <span class="n">View</span>
<span class="k">class</span> <span class="nc">MyView</span><span class="p">(</span><span class="n">View</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="k">return</span> <span class="n">HttpResponse</span><span class="p">(</span><span class="s">'Hello, World!'</span><span class="p">)</span>
</pre></div>
</div>
<p><strong>Example urls.py</strong>:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">django.conf.urls</span> <span class="kn">import</span> <span class="n">patterns</span><span class="p">,</span> <span class="n">url</span>
<span class="kn">from</span> <span class="nn">myapp.views</span> <span class="kn">import</span> <span class="n">MyView</span>
<span class="n">urlpatterns</span> <span class="o">=</span> <span class="n">patterns</span><span class="p">(</span><span class="s">''</span><span class="p">,</span>
<span class="n">url</span><span class="p">(</span><span class="s">r'^mine/$'</span><span class="p">,</span> <span class="n">MyView</span><span class="o">.</span><span class="n">as_view</span><span class="p">(),</span> <span class="n">name</span><span class="o">=</span><span class="s">'my-view'</span><span class="p">),</span>
<span class="p">)</span>
</pre></div>
</div>
<p><strong>Attributes</strong></p>
<dl class="attribute">
<dt id="django.views.generic.base.View.http_method_names">
<tt class="descname">http_method_names</tt><a class="headerlink" href="#django.views.generic.base.View.http_method_names" title="Permalink to this definition">¶</a></dt>
<dd><p>The list of HTTP method names that this view will accept.</p>
<p>Default:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="p">[</span><span class="s">'get'</span><span class="p">,</span> <span class="s">'post'</span><span class="p">,</span> <span class="s">'put'</span><span class="p">,</span> <span class="s">'delete'</span><span class="p">,</span> <span class="s">'head'</span><span class="p">,</span> <span class="s">'options'</span><span class="p">,</span> <span class="s">'trace'</span><span class="p">]</span>
</pre></div>
</div>
</dd></dl>
<p><strong>Methods</strong></p>
<dl class="classmethod">
<dt id="django.views.generic.base.View.as_view">
<em class="property">classmethod </em><tt class="descname">as_view</tt>(<em>**initkwargs</em>)<a class="headerlink" href="#django.views.generic.base.View.as_view" title="Permalink to this definition">¶</a></dt>
<dd><p>Returns a callable view that takes a request and returns a response:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="n">response</span> <span class="o">=</span> <span class="n">MyView</span><span class="o">.</span><span class="n">as_view</span><span class="p">()(</span><span class="n">request</span><span class="p">)</span>
</pre></div>
</div>
</dd></dl>
<dl class="method">
<dt id="django.views.generic.base.View.dispatch">
<tt class="descname">dispatch</tt>(<em>request</em>, <em>*args</em>, <em>**kwargs</em>)<a class="headerlink" href="#django.views.generic.base.View.dispatch" title="Permalink to this definition">¶</a></dt>
<dd><p>The <tt class="docutils literal"><span class="pre">view</span></tt> part of the view – the method that accepts a <tt class="docutils literal"><span class="pre">request</span></tt>
argument plus arguments, and returns a HTTP response.</p>
<p>The default implementation will inspect the HTTP method and attempt to
delegate to a method that matches the HTTP method; a <tt class="docutils literal"><span class="pre">GET</span></tt> will be
delegated to <tt class="docutils literal"><span class="pre">get()</span></tt>, a <tt class="docutils literal"><span class="pre">POST</span></tt> to <tt class="docutils literal"><span class="pre">post()</span></tt>, and so on.</p>
<p>By default, a <tt class="docutils literal"><span class="pre">HEAD</span></tt> request will be delegated to <tt class="docutils literal"><span class="pre">get()</span></tt>.
If you need to handle <tt class="docutils literal"><span class="pre">HEAD</span></tt> requests in a different way than <tt class="docutils literal"><span class="pre">GET</span></tt>,
you can override the <tt class="docutils literal"><span class="pre">head()</span></tt> method. See
<a class="reference internal" href="../../topics/class-based-views/index.html#supporting-other-http-methods"><em>Supporting other HTTP methods</em></a> for an example.</p>
</dd></dl>
<dl class="method">
<dt id="django.views.generic.base.View.http_method_not_allowed">
<tt class="descname">http_method_not_allowed</tt>(<em>request</em>, <em>*args</em>, <em>**kwargs</em>)<a class="headerlink" href="#django.views.generic.base.View.http_method_not_allowed" title="Permalink to this definition">¶</a></dt>
<dd><p>If the view was called with a HTTP method it doesn’t support, this
method is called instead.</p>
<p>The default implementation returns <tt class="docutils literal"><span class="pre">HttpResponseNotAllowed</span></tt> with a
list of allowed methods in plain text.</p>
</dd></dl>
<dl class="method">
<dt id="django.views.generic.base.View.options">
<tt class="descname">options</tt>(<em>request</em>, <em>*args</em>, <em>**kwargs</em>)<a class="headerlink" href="#django.views.generic.base.View.options" title="Permalink to this definition">¶</a></dt>
<dd><p>Handles responding to requests for the OPTIONS HTTP verb. Returns a
list of the allowed HTTP method names for the view.</p>
</dd></dl>
</dd></dl>
</div>
<div class="section" id="s-templateview">
<span id="templateview"></span><h2>TemplateView<a class="headerlink" href="#templateview" title="Permalink to this headline">¶</a></h2>
<dl class="class">
<dt id="django.views.generic.base.TemplateView">
<em class="property">class </em><tt class="descclassname">django.views.generic.base.</tt><tt class="descname">TemplateView</tt><a class="headerlink" href="#django.views.generic.base.TemplateView" title="Permalink to this definition">¶</a></dt>
<dd><p>Renders a given template, with the context containing parameters captured
in the URL.</p>
<div class="versionchanged">
<span class="title">Changed in Django 1.5:</span> The context used to be populated with a <tt class="docutils literal"><span class="pre">{{</span> <span class="pre">params</span> <span class="pre">}}</span></tt> dictionary of
the parameters captured in the URL. Now those parameters are first-level
context variables.</div>
<p><strong>Ancestors (MRO)</strong></p>
<p>This view inherits methods and attributes from the following views:</p>
<ul class="simple">
<li><a class="reference internal" href="mixins-simple.html#django.views.generic.base.TemplateResponseMixin" title="django.views.generic.base.TemplateResponseMixin"><tt class="xref py py-class docutils literal"><span class="pre">django.views.generic.base.TemplateResponseMixin</span></tt></a></li>
<li><a class="reference internal" href="mixins-simple.html#django.views.generic.base.ContextMixin" title="django.views.generic.base.ContextMixin"><tt class="xref py py-class docutils literal"><span class="pre">django.views.generic.base.ContextMixin</span></tt></a></li>
<li><a class="reference internal" href="#django.views.generic.base.View" title="django.views.generic.base.View"><tt class="xref py py-class docutils literal"><span class="pre">django.views.generic.base.View</span></tt></a></li>
</ul>
<p><strong>Method Flowchart</strong></p>
<ol class="arabic simple">
<li><a class="reference internal" href="#django.views.generic.base.View.dispatch" title="django.views.generic.base.View.dispatch"><tt class="xref py py-meth docutils literal"><span class="pre">dispatch()</span></tt></a></li>
<li><a class="reference internal" href="#django.views.generic.base.View.http_method_not_allowed" title="django.views.generic.base.View.http_method_not_allowed"><tt class="xref py py-meth docutils literal"><span class="pre">http_method_not_allowed()</span></tt></a></li>
<li><a class="reference internal" href="mixins-simple.html#django.views.generic.base.ContextMixin.get_context_data" title="django.views.generic.base.ContextMixin.get_context_data"><tt class="xref py py-meth docutils literal"><span class="pre">get_context_data()</span></tt></a></li>
</ol>
<p><strong>Example views.py</strong>:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">django.views.generic.base</span> <span class="kn">import</span> <span class="n">TemplateView</span>
<span class="kn">from</span> <span class="nn">articles.models</span> <span class="kn">import</span> <span class="n">Article</span>
<span class="k">class</span> <span class="nc">HomePageView</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="s">"home.html"</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">HomePageView</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="p">[</span><span class="s">'latest_articles'</span><span class="p">]</span> <span class="o">=</span> <span class="n">Article</span><span class="o">.</span><span class="n">objects</span><span class="o">.</span><span class="n">all</span><span class="p">()[:</span><span class="mi">5</span><span class="p">]</span>
<span class="k">return</span> <span class="n">context</span>
</pre></div>
</div>
<p><strong>Example urls.py</strong>:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">django.conf.urls</span> <span class="kn">import</span> <span class="n">patterns</span><span class="p">,</span> <span class="n">url</span>
<span class="kn">from</span> <span class="nn">myapp.views</span> <span class="kn">import</span> <span class="n">HomePageView</span>
<span class="n">urlpatterns</span> <span class="o">=</span> <span class="n">patterns</span><span class="p">(</span><span class="s">''</span><span class="p">,</span>
<span class="n">url</span><span class="p">(</span><span class="s">r'^$'</span><span class="p">,</span> <span class="n">HomePageView</span><span class="o">.</span><span class="n">as_view</span><span class="p">(),</span> <span class="n">name</span><span class="o">=</span><span class="s">'home'</span><span class="p">),</span>
<span class="p">)</span>
</pre></div>
</div>
<p><strong>Context</strong></p>
<ul class="simple">
<li>Populated (through <a class="reference internal" href="mixins-simple.html#django.views.generic.base.ContextMixin" title="django.views.generic.base.ContextMixin"><tt class="xref py py-class docutils literal"><span class="pre">ContextMixin</span></tt></a>) with
the keyword arguments captured from the URL pattern that served the view.</li>
</ul>
</dd></dl>
</div>
<div class="section" id="s-redirectview">
<span id="redirectview"></span><h2>RedirectView<a class="headerlink" href="#redirectview" title="Permalink to this headline">¶</a></h2>
<dl class="class">
<dt id="django.views.generic.base.RedirectView">
<em class="property">class </em><tt class="descclassname">django.views.generic.base.</tt><tt class="descname">RedirectView</tt><a class="headerlink" href="#django.views.generic.base.RedirectView" title="Permalink to this definition">¶</a></dt>
<dd><p>Redirects to a given URL.</p>
<p>The given URL may contain dictionary-style string formatting, which will be
interpolated against the parameters captured in the URL. Because keyword
interpolation is <em>always</em> done (even if no arguments are passed in), any
<tt class="docutils literal"><span class="pre">"%"</span></tt> characters in the URL must be written as <tt class="docutils literal"><span class="pre">"%%"</span></tt> so that Python
will convert them to a single percent sign on output.</p>
<p>If the given URL is <tt class="docutils literal"><span class="pre">None</span></tt>, Django will return an <tt class="docutils literal"><span class="pre">HttpResponseGone</span></tt>
(410).</p>
<p><strong>Ancestors (MRO)</strong></p>
<p>This view inherits methods and attributes from the following view:</p>
<ul class="simple">
<li><a class="reference internal" href="#django.views.generic.base.View" title="django.views.generic.base.View"><tt class="xref py py-class docutils literal"><span class="pre">django.views.generic.base.View</span></tt></a></li>
</ul>
<p><strong>Method Flowchart</strong></p>
<ol class="arabic simple">
<li><a class="reference internal" href="#django.views.generic.base.View.dispatch" title="django.views.generic.base.View.dispatch"><tt class="xref py py-meth docutils literal"><span class="pre">dispatch()</span></tt></a></li>
<li><a class="reference internal" href="#django.views.generic.base.View.http_method_not_allowed" title="django.views.generic.base.View.http_method_not_allowed"><tt class="xref py py-meth docutils literal"><span class="pre">http_method_not_allowed()</span></tt></a></li>
<li><a class="reference internal" href="#django.views.generic.base.RedirectView.get_redirect_url" title="django.views.generic.base.RedirectView.get_redirect_url"><tt class="xref py py-meth docutils literal"><span class="pre">get_redirect_url()</span></tt></a></li>
</ol>
<p><strong>Example views.py</strong>:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">django.core.urlresolvers</span> <span class="kn">import</span> <span class="n">reverse</span>
<span class="kn">from</span> <span class="nn">django.shortcuts</span> <span class="kn">import</span> <span class="n">get_object_or_404</span>
<span class="kn">from</span> <span class="nn">django.views.generic.base</span> <span class="kn">import</span> <span class="n">RedirectView</span>
<span class="kn">from</span> <span class="nn">articles.models</span> <span class="kn">import</span> <span class="n">Article</span>
<span class="k">class</span> <span class="nc">ArticleCounterRedirectView</span><span class="p">(</span><span class="n">RedirectView</span><span class="p">):</span>
<span class="n">permanent</span> <span class="o">=</span> <span class="bp">False</span>
<span class="n">query_string</span> <span class="o">=</span> <span class="bp">True</span>
<span class="k">def</span> <span class="nf">get_redirect_url</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">pk</span><span class="p">):</span>
<span class="n">article</span> <span class="o">=</span> <span class="n">get_object_or_404</span><span class="p">(</span><span class="n">Article</span><span class="p">,</span> <span class="n">pk</span><span class="o">=</span><span class="n">pk</span><span class="p">)</span>
<span class="n">article</span><span class="o">.</span><span class="n">update_counter</span><span class="p">()</span>
<span class="k">return</span> <span class="n">reverse</span><span class="p">(</span><span class="s">'product_detail'</span><span class="p">,</span> <span class="n">args</span><span class="o">=</span><span class="p">(</span><span class="n">pk</span><span class="p">,))</span>
</pre></div>
</div>
<p><strong>Example urls.py</strong>:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">django.conf.urls</span> <span class="kn">import</span> <span class="n">patterns</span><span class="p">,</span> <span class="n">url</span>
<span class="kn">from</span> <span class="nn">django.views.generic.base</span> <span class="kn">import</span> <span class="n">RedirectView</span>
<span class="kn">from</span> <span class="nn">article.views</span> <span class="kn">import</span> <span class="n">ArticleCounterRedirectView</span>
<span class="n">urlpatterns</span> <span class="o">=</span> <span class="n">patterns</span><span class="p">(</span><span class="s">''</span><span class="p">,</span>
<span class="n">url</span><span class="p">(</span><span class="s">r'^(?P<pk>\d+)/$'</span><span class="p">,</span> <span class="n">ArticleCounterRedirectView</span><span class="o">.</span><span class="n">as_view</span><span class="p">(),</span> <span class="n">name</span><span class="o">=</span><span class="s">'article-counter'</span><span class="p">),</span>
<span class="n">url</span><span class="p">(</span><span class="s">r'^go-to-django/$'</span><span class="p">,</span> <span class="n">RedirectView</span><span class="o">.</span><span class="n">as_view</span><span class="p">(</span><span class="n">url</span><span class="o">=</span><span class="s">'http://djangoproject.com'</span><span class="p">),</span> <span class="n">name</span><span class="o">=</span><span class="s">'go-to-django'</span><span class="p">),</span>
<span class="p">)</span>
</pre></div>
</div>
<p><strong>Attributes</strong></p>
<dl class="attribute">
<dt id="django.views.generic.base.RedirectView.url">
<tt class="descname">url</tt><a class="headerlink" href="#django.views.generic.base.RedirectView.url" title="Permalink to this definition">¶</a></dt>
<dd><p>The URL to redirect to, as a string. Or <tt class="docutils literal"><span class="pre">None</span></tt> to raise a 410 (Gone)
HTTP error.</p>
</dd></dl>
<dl class="attribute">
<dt id="django.views.generic.base.RedirectView.permanent">
<tt class="descname">permanent</tt><a class="headerlink" href="#django.views.generic.base.RedirectView.permanent" title="Permalink to this definition">¶</a></dt>
<dd><p>Whether the redirect should be permanent. The only difference here is
the HTTP status code returned. If <tt class="docutils literal"><span class="pre">True</span></tt>, then the redirect will use
status code 301. If <tt class="docutils literal"><span class="pre">False</span></tt>, then the redirect will use status code
302. By default, <tt class="docutils literal"><span class="pre">permanent</span></tt> is <tt class="docutils literal"><span class="pre">True</span></tt>.</p>
</dd></dl>
<dl class="attribute">
<dt id="django.views.generic.base.RedirectView.query_string">
<tt class="descname">query_string</tt><a class="headerlink" href="#django.views.generic.base.RedirectView.query_string" title="Permalink to this definition">¶</a></dt>
<dd><p>Whether to pass along the GET query string to the new location. If
<tt class="docutils literal"><span class="pre">True</span></tt>, then the query string is appended to the URL. If <tt class="docutils literal"><span class="pre">False</span></tt>,
then the query string is discarded. By default, <tt class="docutils literal"><span class="pre">query_string</span></tt> is
<tt class="docutils literal"><span class="pre">False</span></tt>.</p>
</dd></dl>
<p><strong>Methods</strong></p>
<dl class="method">
<dt id="django.views.generic.base.RedirectView.get_redirect_url">
<tt class="descname">get_redirect_url</tt>(<em>**kwargs</em>)<a class="headerlink" href="#django.views.generic.base.RedirectView.get_redirect_url" title="Permalink to this definition">¶</a></dt>
<dd><p>Constructs the target URL for redirection.</p>
<p>The default implementation uses <a class="reference internal" href="#django.views.generic.base.RedirectView.url" title="django.views.generic.base.RedirectView.url"><tt class="xref py py-attr docutils literal"><span class="pre">url</span></tt></a> as a starting
string, performs expansion of <tt class="docutils literal"><span class="pre">%</span></tt> parameters in that string, as well
as the appending of query string if requested by <a class="reference internal" href="#django.views.generic.base.RedirectView.query_string" title="django.views.generic.base.RedirectView.query_string"><tt class="xref py py-attr docutils literal"><span class="pre">query_string</span></tt></a>.
Subclasses may implement any behavior they wish, as long as the method
returns a redirect-ready URL string.</p>
</dd></dl>
</dd></dl>
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