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<span id="django-1-9-1-release-notes"></span><h1>Django 1.9.1 release notes<a class="headerlink" href="#django-1-9-1-release-notes" title="Permalink to this headline">¶</a></h1>
<p><em>January 2, 2016</em></p>
<p>Django 1.9.1 fixes several bugs in 1.9.</p>
<div class="section" id="s-bugfixes">
<span id="bugfixes"></span><h2>Bugfixes<a class="headerlink" href="#bugfixes" title="Permalink to this headline">¶</a></h2>
<ul class="simple">
<li>Fixed <code class="docutils literal notranslate"><span class="pre">BaseCache.get_or_set()</span></code> with the <code class="docutils literal notranslate"><span class="pre">DummyCache</span></code> backend
(<a class="reference external" href="https://code.djangoproject.com/ticket/25840">#25840</a>).</li>
<li>Fixed a regression in <code class="docutils literal notranslate"><span class="pre">FormMixin</span></code> causing forms to be validated twice
(<a class="reference external" href="https://code.djangoproject.com/ticket/25548">#25548</a>, <a class="reference external" href="https://code.djangoproject.com/ticket/26018">#26018</a>).</li>
<li>Fixed a system check crash with nested <code class="docutils literal notranslate"><span class="pre">ArrayField</span></code>s (<a class="reference external" href="https://code.djangoproject.com/ticket/25867">#25867</a>).</li>
<li>Fixed a state bug when migrating a <code class="docutils literal notranslate"><span class="pre">SeparateDatabaseAndState</span></code> operation
backwards (<a class="reference external" href="https://code.djangoproject.com/ticket/25896">#25896</a>).</li>
<li>Fixed a regression in <code class="docutils literal notranslate"><span class="pre">CommonMiddleware</span></code> causing <code class="docutils literal notranslate"><span class="pre">If-None-Match</span></code> checks
to always return HTTP 200 (<a class="reference external" href="https://code.djangoproject.com/ticket/25900">#25900</a>).</li>
<li>Fixed missing <code class="docutils literal notranslate"><span class="pre">varchar/text_pattern_ops</span></code> index on <code class="docutils literal notranslate"><span class="pre">CharField</span></code> and
<code class="docutils literal notranslate"><span class="pre">TextField</span></code> respectively when using <code class="docutils literal notranslate"><span class="pre">AlterField</span></code> on PostgreSQL
(<a class="reference external" href="https://code.djangoproject.com/ticket/25412">#25412</a>).</li>
<li>Fixed admin’s delete confirmation page’s summary counts of related objects
(<a class="reference external" href="https://code.djangoproject.com/ticket/25883">#25883</a>).</li>
<li>Added <code class="docutils literal notranslate"><span class="pre">from</span> <span class="pre">__future__</span> <span class="pre">import</span> <span class="pre">unicode_literals</span></code> to the default <code class="docutils literal notranslate"><span class="pre">apps.py</span></code>
created by <code class="docutils literal notranslate"><span class="pre">startapp</span></code> on Python 2 (<a class="reference external" href="https://code.djangoproject.com/ticket/25909">#25909</a>). Add this line to your
own <code class="docutils literal notranslate"><span class="pre">apps.py</span></code> files created using Django 1.9 if you want your migrations
to work on both Python 2 and Python 3.</li>
<li>Prevented <code class="docutils literal notranslate"><span class="pre">QuerySet.delete()</span></code> from crashing on MySQL when querying across
relations (<a class="reference external" href="https://code.djangoproject.com/ticket/25882">#25882</a>).</li>
<li>Fixed evaluation of zero-length slices of <code class="docutils literal notranslate"><span class="pre">QuerySet.values()</span></code>
(<a class="reference external" href="https://code.djangoproject.com/ticket/25894">#25894</a>).</li>
<li>Fixed a state bug when using an <code class="docutils literal notranslate"><span class="pre">AlterModelManagers</span></code> operation
(<a class="reference external" href="https://code.djangoproject.com/ticket/25852">#25852</a>).</li>
<li>Fixed <code class="docutils literal notranslate"><span class="pre">TypedChoiceField</span></code> change detection with nullable fields
(<a class="reference external" href="https://code.djangoproject.com/ticket/25942">#25942</a>).</li>
<li>Fixed incorrect timezone warnings in custom admin templates that don’t have
a <code class="docutils literal notranslate"><span class="pre">data-admin-utc-offset</span></code> attribute in the <code class="docutils literal notranslate"><span class="pre">body</span></code> tag.
(<a class="reference external" href="https://code.djangoproject.com/ticket/25845">#25845</a>).</li>
<li>Fixed a regression which prevented using a language not in Django’s default
language list (<a class="reference internal" href="../ref/settings.html#std:setting-LANGUAGES"><code class="xref std std-setting docutils literal notranslate"><span class="pre">LANGUAGES</span></code></a>) (<a class="reference external" href="https://code.djangoproject.com/ticket/25915">#25915</a>).</li>
<li>Avoided hiding some exceptions, like an invalid <code class="docutils literal notranslate"><span class="pre">INSTALLED_APPS</span></code> setting,
behind <code class="docutils literal notranslate"><span class="pre">AppRegistryNotReady</span></code> when starting <code class="docutils literal notranslate"><span class="pre">runserver</span></code> (<a class="reference external" href="https://code.djangoproject.com/ticket/25510">#25510</a>).
This regression appeared in 1.8.5 as a side effect of fixing <a class="reference external" href="https://code.djangoproject.com/ticket/24704">#24704</a>
and by mistake the fix wasn’t applied to the <code class="docutils literal notranslate"><span class="pre">stable/1.9.x</span></code> branch.</li>
<li>Fixed <code class="docutils literal notranslate"><span class="pre">migrate</span> <span class="pre">--fake-initial</span></code> detection of many-to-many tables
(<a class="reference external" href="https://code.djangoproject.com/ticket/25922">#25922</a>).</li>
<li>Restored the functionality of the admin’s <code class="docutils literal notranslate"><span class="pre">list_editable</span></code> add and change
buttons (<a class="reference external" href="https://code.djangoproject.com/ticket/25903">#25903</a>).</li>
<li>Fixed <code class="docutils literal notranslate"><span class="pre">isnull</span></code> query lookup for <code class="docutils literal notranslate"><span class="pre">ForeignObject</span></code>
(<a class="reference external" href="https://code.djangoproject.com/ticket/25972">#25972</a>).</li>
<li>Fixed a regression in the admin which ignored line breaks in read-only fields
instead of converting them to <code class="docutils literal notranslate"><span class="pre"><br></span></code> (<a class="reference external" href="https://code.djangoproject.com/ticket/25465">#25465</a>).</li>
<li>Fixed incorrect object reference in
<code class="docutils literal notranslate"><span class="pre">SingleObjectMixin.get_context_object_name()</span></code> (<a class="reference external" href="https://code.djangoproject.com/ticket/26006">#26006</a>).</li>
<li>Made <code class="docutils literal notranslate"><span class="pre">loaddata</span></code> skip disabling and enabling database constraints when it
doesn’t load any fixtures (<a class="reference external" href="https://code.djangoproject.com/ticket/23372">#23372</a>).</li>
<li>Restored <code class="docutils literal notranslate"><span class="pre">contrib.auth</span></code> hashers compatibility with py-bcrypt
(<a class="reference external" href="https://code.djangoproject.com/ticket/26016">#26016</a>).</li>
<li>Fixed a crash in <code class="docutils literal notranslate"><span class="pre">QuerySet.values()/values_list()</span></code> after an <code class="docutils literal notranslate"><span class="pre">annotate()</span></code>
and <code class="docutils literal notranslate"><span class="pre">order_by()</span></code> when <code class="docutils literal notranslate"><span class="pre">values()/values_list()</span></code> includes a field not in
the <code class="docutils literal notranslate"><span class="pre">order_by()</span></code> (<a class="reference external" href="https://code.djangoproject.com/ticket/25316">#25316</a>).</li>
</ul>
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