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<div class="section" id="s-upgrading-templates-to-django-1-8">
<span id="upgrading-templates-to-django-1-8"></span><h1>Upgrading templates to Django 1.8<a class="headerlink" href="#upgrading-templates-to-django-1-8" title="Permalink to this headline">¶</a></h1>
<p>Django’s template system was overhauled in Django 1.8 when it gained support
for multiple template engines. This document complements the <a class="reference internal" href="../../releases/1.8.html"><span class="doc">release
notes</span></a> with detailed upgrade instructions on some topics.</p>
<div class="section" id="s-the-templates-settings">
<span id="the-templates-settings"></span><h2>The <a class="reference internal" href="../settings.html#std:setting-TEMPLATES"><code class="xref std std-setting docutils literal"><span class="pre">TEMPLATES</span></code></a> settings<a class="headerlink" href="#the-templates-settings" title="Permalink to this headline">¶</a></h2>
<p>A new setting was introduced in Django 1.8: <a class="reference internal" href="../settings.html#std:setting-TEMPLATES"><code class="xref std std-setting docutils literal"><span class="pre">TEMPLATES</span></code></a>. All existing
template-related settings were deprecated.</p>
<p>During the deprecation period, Django will create a backwards-compatible
<a class="reference internal" href="../settings.html#std:setting-TEMPLATES"><code class="xref std std-setting docutils literal"><span class="pre">TEMPLATES</span></code></a> based on the <code class="docutils literal"><span class="pre">TEMPLATE_*</span></code> settings if you don’t define
it yourself.</p>
<p>Here’s how to define <a class="reference internal" href="../settings.html#std:setting-TEMPLATES"><code class="xref std std-setting docutils literal"><span class="pre">TEMPLATES</span></code></a> in your settings module.</p>
<p>If you’re using the default value of <code class="docutils literal"><span class="pre">TEMPLATE_LOADERS</span></code>, that is, if it
isn’t defined in your settings file or if it’s set to:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="p">(</span><span class="s1">'django.template.loaders.filesystem.Loader'</span><span class="p">,</span>
<span class="s1">'django.template.loaders.app_directories.Loader'</span><span class="p">)</span>
</pre></div>
</div>
<p>then you should define <a class="reference internal" href="../settings.html#std:setting-TEMPLATES"><code class="xref std std-setting docutils literal"><span class="pre">TEMPLATES</span></code></a> as follows:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">TEMPLATES</span> <span class="o">=</span> <span class="p">[</span>
<span class="p">{</span>
<span class="s1">'BACKEND'</span><span class="p">:</span> <span class="s1">'django.template.backends.django.DjangoTemplates'</span><span class="p">,</span>
<span class="s1">'DIRS'</span><span class="p">:</span> <span class="p">[</span>
<span class="c1"># insert your TEMPLATE_DIRS here</span>
<span class="p">],</span>
<span class="s1">'APP_DIRS'</span><span class="p">:</span> <span class="kc">True</span><span class="p">,</span>
<span class="s1">'OPTIONS'</span><span class="p">:</span> <span class="p">{</span>
<span class="s1">'context_processors'</span><span class="p">:</span> <span class="p">[</span>
<span class="c1"># Insert your TEMPLATE_CONTEXT_PROCESSORS here or use this</span>
<span class="c1"># list if you haven't customized them:</span>
<span class="s1">'django.contrib.auth.context_processors.auth'</span><span class="p">,</span>
<span class="s1">'django.template.context_processors.debug'</span><span class="p">,</span>
<span class="s1">'django.template.context_processors.i18n'</span><span class="p">,</span>
<span class="s1">'django.template.context_processors.media'</span><span class="p">,</span>
<span class="s1">'django.template.context_processors.static'</span><span class="p">,</span>
<span class="s1">'django.template.context_processors.tz'</span><span class="p">,</span>
<span class="s1">'django.contrib.messages.context_processors.messages'</span><span class="p">,</span>
<span class="p">],</span>
<span class="p">},</span>
<span class="p">},</span>
<span class="p">]</span>
</pre></div>
</div>
<p>If you aren’t using the default value of <code class="docutils literal"><span class="pre">TEMPLATE_LOADERS</span></code>, then you should
define <a class="reference internal" href="../settings.html#std:setting-TEMPLATES"><code class="xref std std-setting docutils literal"><span class="pre">TEMPLATES</span></code></a> as follows:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">TEMPLATES</span> <span class="o">=</span> <span class="p">[</span>
<span class="p">{</span>
<span class="s1">'BACKEND'</span><span class="p">:</span> <span class="s1">'django.template.backends.django.DjangoTemplates'</span><span class="p">,</span>
<span class="s1">'DIRS'</span><span class="p">:</span> <span class="p">[</span>
<span class="c1"># insert your TEMPLATE_DIRS here</span>
<span class="p">],</span>
<span class="s1">'OPTIONS'</span><span class="p">:</span> <span class="p">{</span>
<span class="s1">'context_processors'</span><span class="p">:</span> <span class="p">[</span>
<span class="c1"># Insert your TEMPLATE_CONTEXT_PROCESSORS here or use this</span>
<span class="c1"># list if you haven't customized them:</span>
<span class="s1">'django.contrib.auth.context_processors.auth'</span><span class="p">,</span>
<span class="s1">'django.template.context_processors.debug'</span><span class="p">,</span>
<span class="s1">'django.template.context_processors.i18n'</span><span class="p">,</span>
<span class="s1">'django.template.context_processors.media'</span><span class="p">,</span>
<span class="s1">'django.template.context_processors.static'</span><span class="p">,</span>
<span class="s1">'django.template.context_processors.tz'</span><span class="p">,</span>
<span class="s1">'django.contrib.messages.context_processors.messages'</span><span class="p">,</span>
<span class="p">],</span>
<span class="s1">'loaders'</span><span class="p">:</span> <span class="p">[</span>
<span class="c1"># insert your TEMPLATE_LOADERS here</span>
<span class="p">]</span>
<span class="p">},</span>
<span class="p">},</span>
<span class="p">]</span>
</pre></div>
</div>
<p>Furthermore you should replace <code class="docutils literal"><span class="pre">django.core.context_processors</span></code> with
<code class="docutils literal"><span class="pre">django.template.context_processors</span></code> in the names of context processors.</p>
<p>If your settings module defines <code class="docutils literal"><span class="pre">ALLOWED_INCLUDE_ROOTS</span></code> or
<code class="docutils literal"><span class="pre">TEMPLATE_STRING_IF_INVALID</span></code>, include their values under the
<code class="docutils literal"><span class="pre">'allowed_include_roots'</span></code> and <code class="docutils literal"><span class="pre">'string_if_invalid'</span></code> keys in the
<code class="docutils literal"><span class="pre">'OPTIONS'</span></code> dictionary.</p>
<p>If it sets <code class="docutils literal"><span class="pre">TEMPLATE_DEBUG</span></code> to a value that differs from <a class="reference internal" href="../settings.html#std:setting-DEBUG"><code class="xref std std-setting docutils literal"><span class="pre">DEBUG</span></code></a>,
include that value under the <code class="docutils literal"><span class="pre">'debug'</span></code> key in <code class="docutils literal"><span class="pre">'OPTIONS'</span></code>.</p>
<p>Once you have defined <a class="reference internal" href="../settings.html#std:setting-TEMPLATES"><code class="xref std std-setting docutils literal"><span class="pre">TEMPLATES</span></code></a>, you can safely remove
<code class="docutils literal"><span class="pre">ALLOWED_INCLUDE_ROOTS</span></code>, <code class="docutils literal"><span class="pre">TEMPLATE_CONTEXT_PROCESSORS</span></code>,
<code class="docutils literal"><span class="pre">TEMPLATE_DEBUG</span></code>, <code class="docutils literal"><span class="pre">TEMPLATE_DIRS</span></code>, <code class="docutils literal"><span class="pre">TEMPLATE_LOADERS</span></code>, and
<code class="docutils literal"><span class="pre">TEMPLATE_STRING_IF_INVALID</span></code>.</p>
<p>If you are overriding some of these settings in tests, you should override the
entire <a class="reference internal" href="../settings.html#std:setting-TEMPLATES"><code class="xref std std-setting docutils literal"><span class="pre">TEMPLATES</span></code></a> setting instead.</p>
</div>
<div class="section" id="s-django-template-loader">
<span id="django-template-loader"></span><h2><a class="reference internal" href="../../topics/templates.html#module-django.template.loader" title="django.template.loader"><code class="xref py py-mod docutils literal"><span class="pre">django.template.loader</span></code></a><a class="headerlink" href="#django-template-loader" title="Permalink to this headline">¶</a></h2>
<div class="section" id="s-get-template-and-select-template">
<span id="s-get-template-upgrade-django-18"></span><span id="get-template-and-select-template"></span><span id="get-template-upgrade-django-18"></span><h3><a class="reference internal" href="../../topics/templates.html#django.template.loader.get_template" title="django.template.loader.get_template"><code class="xref py py-func docutils literal"><span class="pre">get_template()</span></code></a> and <a class="reference internal" href="../../topics/templates.html#django.template.loader.select_template" title="django.template.loader.select_template"><code class="xref py py-func docutils literal"><span class="pre">select_template()</span></code></a><a class="headerlink" href="#get-template-and-select-template" title="Permalink to this headline">¶</a></h3>
<p>In Django 1.8 <a class="reference internal" href="../../topics/templates.html#django.template.loader.get_template" title="django.template.loader.get_template"><code class="xref py py-func docutils literal"><span class="pre">get_template()</span></code></a> and
<a class="reference internal" href="../../topics/templates.html#django.template.loader.select_template" title="django.template.loader.select_template"><code class="xref py py-func docutils literal"><span class="pre">select_template()</span></code></a> return a backend-dependent
<code class="docutils literal"><span class="pre">Template</span></code> instead of a <a class="reference internal" href="api.html#django.template.Template" title="django.template.Template"><code class="xref py py-class docutils literal"><span class="pre">django.template.Template</span></code></a>.</p>
<p>For example, if <a class="reference internal" href="../../topics/templates.html#django.template.loader.get_template" title="django.template.loader.get_template"><code class="xref py py-func docutils literal"><span class="pre">get_template()</span></code></a> loads a template
with a <a class="reference internal" href="../../topics/templates.html#django.template.backends.django.DjangoTemplates" title="django.template.backends.django.DjangoTemplates"><code class="xref py py-class docutils literal"><span class="pre">DjangoTemplates</span></code></a> backend, then
it returns a <code class="docutils literal"><span class="pre">django.template.backends.django.Template</span></code>.</p>
<p><code class="docutils literal"><span class="pre">Template</span></code> objects must provide a
<a class="reference internal" href="../../topics/templates.html#django.template.backends.base.Template.render" title="django.template.backends.base.Template.render"><code class="xref py py-meth docutils literal"><span class="pre">render()</span></code></a> method whose signature
differs slightly from the Django template language’s
<a class="reference internal" href="api.html#django.template.Template.render" title="django.template.Template.render"><code class="xref py py-meth docutils literal"><span class="pre">render()</span></code></a>.</p>
<p>Instead of:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">django.template</span> <span class="k">import</span> <span class="n">Context</span>
<span class="kn">from</span> <span class="nn">django.template.loader</span> <span class="k">import</span> <span class="n">get_template</span>
<span class="n">template</span> <span class="o">=</span> <span class="n">get_template</span><span class="p">(</span><span class="s1">'hello.html'</span><span class="p">)</span>
<span class="n">html</span> <span class="o">=</span> <span class="n">template</span><span class="o">.</span><span class="n">render</span><span class="p">(</span><span class="n">Context</span><span class="p">({</span><span class="s1">'name'</span><span class="p">:</span> <span class="s1">'world'</span><span class="p">}))</span>
</pre></div>
</div>
<p>You should write:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">django.template.loader</span> <span class="k">import</span> <span class="n">get_template</span>
<span class="n">template</span> <span class="o">=</span> <span class="n">get_template</span><span class="p">(</span><span class="s1">'hello.html'</span><span class="p">)</span>
<span class="n">html</span> <span class="o">=</span> <span class="n">template</span><span class="o">.</span><span class="n">render</span><span class="p">({</span><span class="s1">'name'</span><span class="p">:</span> <span class="s1">'world'</span><span class="p">})</span>
</pre></div>
</div>
<p>And instead of:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">django.template</span> <span class="k">import</span> <span class="n">RequestContext</span>
<span class="kn">from</span> <span class="nn">django.template.loader</span> <span class="k">import</span> <span class="n">get_template</span>
<span class="n">template</span> <span class="o">=</span> <span class="n">get_template</span><span class="p">(</span><span class="s1">'hello.html'</span><span class="p">)</span>
<span class="n">html</span> <span class="o">=</span> <span class="n">template</span><span class="o">.</span><span class="n">render</span><span class="p">(</span><span class="n">RequestContext</span><span class="p">(</span><span class="n">request</span><span class="p">,</span> <span class="p">{</span><span class="s1">'name'</span><span class="p">:</span> <span class="s1">'world'</span><span class="p">}))</span>
</pre></div>
</div>
<p>You should write:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">django.template.loader</span> <span class="k">import</span> <span class="n">get_template</span>
<span class="n">template</span> <span class="o">=</span> <span class="n">get_template</span><span class="p">(</span><span class="s1">'hello.html'</span><span class="p">)</span>
<span class="n">html</span> <span class="o">=</span> <span class="n">template</span><span class="o">.</span><span class="n">render</span><span class="p">({</span><span class="s1">'name'</span><span class="p">:</span> <span class="s1">'world'</span><span class="p">},</span> <span class="n">request</span><span class="p">)</span>
</pre></div>
</div>
<p>Passing a <a class="reference internal" href="api.html#django.template.Context" title="django.template.Context"><code class="xref py py-class docutils literal"><span class="pre">Context</span></code></a> or a
<a class="reference internal" href="api.html#django.template.RequestContext" title="django.template.RequestContext"><code class="xref py py-class docutils literal"><span class="pre">RequestContext</span></code></a> is still possible when the template
is loaded by a <a class="reference internal" href="../../topics/templates.html#django.template.backends.django.DjangoTemplates" title="django.template.backends.django.DjangoTemplates"><code class="xref py py-class docutils literal"><span class="pre">DjangoTemplates</span></code></a>
backend but it’s deprecated and won’t be supported in Django 1.10.</p>
<p>If you’re loading a template while you’re rendering another template with the
Django template language and you have access to the current context, for
instance in the <code class="docutils literal"><span class="pre">render()</span></code> method of a template tag, you can use the current
<a class="reference internal" href="api.html#django.template.Engine" title="django.template.Engine"><code class="xref py py-class docutils literal"><span class="pre">Engine</span></code></a> directly. Instead of:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">django.template.loader</span> <span class="k">import</span> <span class="n">get_template</span>
<span class="n">template</span> <span class="o">=</span> <span class="n">get_template</span><span class="p">(</span><span class="s1">'included.html'</span><span class="p">)</span>
</pre></div>
</div>
<p>You can write:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">template</span> <span class="o">=</span> <span class="n">context</span><span class="o">.</span><span class="n">template</span><span class="o">.</span><span class="n">engine</span><span class="o">.</span><span class="n">get_template</span><span class="p">(</span><span class="s1">'included.html'</span><span class="p">)</span>
</pre></div>
</div>
<p>This will load the template with the current engine without triggering the
multiple template engines machinery, which is usually the desired behavior.
Unlike previous solutions, this returns a <a class="reference internal" href="api.html#django.template.Template" title="django.template.Template"><code class="xref py py-class docutils literal"><span class="pre">django.template.Template</span></code></a>,
like <a class="reference internal" href="../../topics/templates.html#django.template.loader.get_template" title="django.template.loader.get_template"><code class="xref py py-func docutils literal"><span class="pre">get_template()</span></code></a> used to in Django 1.7 and
earlier, avoiding all backwards-compatibility problems.</p>
</div>
<div class="section" id="s-get-template-from-string">
<span id="get-template-from-string"></span><h3><code class="docutils literal"><span class="pre">get_template_from_string()</span></code><a class="headerlink" href="#get-template-from-string" title="Permalink to this headline">¶</a></h3>
<p>Private API <code class="docutils literal"><span class="pre">get_template_from_string(template_code)</span></code> was removed in Django
1.8 because it had no way to choose an engine to compile the template.</p>
<p>Three alternatives are available.</p>
<p>If you control the project’s setting, you can use one of the configured
engines:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">django.template</span> <span class="k">import</span> <span class="n">engines</span>
<span class="n">template</span> <span class="o">=</span> <span class="n">engines</span><span class="p">[</span><span class="s1">'django'</span><span class="p">]</span><span class="o">.</span><span class="n">from_string</span><span class="p">(</span><span class="n">template_code</span><span class="p">)</span>
</pre></div>
</div>
<p>This returns a backend-dependent <code class="docutils literal"><span class="pre">Template</span></code> object.</p>
<p>For trivial templates that don’t need context processors nor anything else,
you can create a bare-bones engine and use its <code class="docutils literal"><span class="pre">from_string()</span></code> method:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">django.template</span> <span class="k">import</span> <span class="n">Engine</span>
<span class="n">template</span> <span class="o">=</span> <span class="n">Engine</span><span class="p">()</span><span class="o">.</span><span class="n">from_string</span><span class="p">(</span><span class="n">template_code</span><span class="p">)</span>
</pre></div>
</div>
<p>This returns a <a class="reference internal" href="api.html#django.template.Template" title="django.template.Template"><code class="xref py py-class docutils literal"><span class="pre">django.template.Template</span></code></a> because
<a class="reference internal" href="api.html#django.template.Engine" title="django.template.Engine"><code class="xref py py-class docutils literal"><span class="pre">Engine</span></code></a> is part of the Django template language’s
APIs. The multiple template engines machinery isn’t involved here.</p>
<p>Finally, if you have access to the current context, you can use the same trick
as above:</p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="n">template</span> <span class="o">=</span> <span class="n">context</span><span class="o">.</span><span class="n">template</span><span class="o">.</span><span class="n">engine</span><span class="o">.</span><span class="n">from_string</span><span class="p">(</span><span class="n">template_code</span><span class="p">)</span>
</pre></div>
</div>
</div>
</div>
<div class="section" id="s-template">
<span id="template"></span><h2><code class="docutils literal"><span class="pre">Template()</span></code><a class="headerlink" href="#template" title="Permalink to this headline">¶</a></h2>
<p>To a lesser extent, instantiating a template with <code class="docutils literal"><span class="pre">Template(template_code)</span></code>
suffers from the same issue as <code class="docutils literal"><span class="pre">get_template_from_string()</span></code>.</p>
<p>It still works when the <a class="reference internal" href="../settings.html#std:setting-TEMPLATES"><code class="xref std std-setting docutils literal"><span class="pre">TEMPLATES</span></code></a> setting defines exactly one
<a class="reference internal" href="../../topics/templates.html#django.template.backends.django.DjangoTemplates" title="django.template.backends.django.DjangoTemplates"><code class="xref py py-class docutils literal"><span class="pre">DjangoTemplates</span></code></a> backend, but
pluggable applications can’t control this requirement.</p>
<p>The last two solutions described in the previous section are recommended in
that case.</p>
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<li><a class="reference internal" href="#">Upgrading templates to Django 1.8</a><ul>
<li><a class="reference internal" href="#the-templates-settings">The <code class="docutils literal"><span class="pre">TEMPLATES</span></code> settings</a></li>
<li><a class="reference internal" href="#django-template-loader"><code class="docutils literal"><span class="pre">django.template.loader</span></code></a><ul>
<li><a class="reference internal" href="#get-template-and-select-template"><code class="docutils literal"><span class="pre">get_template()</span></code> and <code class="docutils literal"><span class="pre">select_template()</span></code></a></li>
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