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  <div class="section" id="s-django-1-8-2-release-notes">
<span id="django-1-8-2-release-notes"></span><h1>Django 1.8.2 release notes<a class="headerlink" href="#django-1-8-2-release-notes" title="Permalink to this headline">¶</a></h1>
<p><em>May 20, 2015</em></p>
<p>Django 1.8.2 fixes a security issue and several bugs in 1.8.1.</p>
<div class="section" id="s-fixed-session-flushing-in-the-cached-db-backend">
<span id="fixed-session-flushing-in-the-cached-db-backend"></span><h2>Fixed session flushing in the <code class="docutils literal"><span class="pre">cached_db</span></code> backend<a class="headerlink" href="#fixed-session-flushing-in-the-cached-db-backend" title="Permalink to this headline">¶</a></h2>
<p>A change to <code class="docutils literal"><span class="pre">session.flush()</span></code> in the <code class="docutils literal"><span class="pre">cached_db</span></code> session backend in Django
1.8 mistakenly sets the session key to an empty string rather than <code class="docutils literal"><span class="pre">None</span></code>. An
empty string is treated as a valid session key and the session cookie is set
accordingly. Any users with an empty string in their session cookie will use
the same session store. <code class="docutils literal"><span class="pre">session.flush()</span></code> is called by
<code class="docutils literal"><span class="pre">django.contrib.auth.logout()</span></code> and, more seriously, by
<code class="docutils literal"><span class="pre">django.contrib.auth.login()</span></code> when a user switches accounts. If a user is
logged in and logs in again to a different account (without logging out) the
session is flushed to avoid reuse. After the session is flushed (and its
session key becomes <code class="docutils literal"><span class="pre">''</span></code>) the account details are set on the session and the
session is saved. Any users with an empty string in their session cookie will
now be logged into that account.</p>
</div>
<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 check for template engine alias uniqueness (<a class="reference external" href="https://code.djangoproject.com/ticket/24685">#24685</a>).</li>
<li>Fixed crash when reusing the same <code class="docutils literal"><span class="pre">Case</span></code> instance in a query
(<a class="reference external" href="https://code.djangoproject.com/ticket/24752">#24752</a>).</li>
<li>Corrected join promotion for <code class="docutils literal"><span class="pre">Case</span></code> expressions. For example, annotating a
query with a  <code class="docutils literal"><span class="pre">Case</span></code> expression could unexpectedly filter out results
(<a class="reference external" href="https://code.djangoproject.com/ticket/24766">#24766</a>).</li>
<li>Fixed negated <code class="docutils literal"><span class="pre">Q</span></code> objects in expressions. Cases like
<code class="docutils literal"><span class="pre">Case(When(~Q(friends__age__lte=30)))</span></code> tried to generate a subquery which
resulted in a crash (<a class="reference external" href="https://code.djangoproject.com/ticket/24705">#24705</a>).</li>
<li>Fixed incorrect GROUP BY clause generation on MySQL when the query&#8217;s model
has a self-referential foreign key (<a class="reference external" href="https://code.djangoproject.com/ticket/24748">#24748</a>).</li>
<li>Implemented <code class="docutils literal"><span class="pre">ForeignKey.get_db_prep_value()</span></code> so that <code class="docutils literal"><span class="pre">ForeignKey</span></code>s
pointing to <a class="reference internal" href="../ref/models/fields.html#django.db.models.UUIDField" title="django.db.models.UUIDField"><code class="xref py py-class docutils literal"><span class="pre">UUIDField</span></code></a> and inheritance on models
with <code class="docutils literal"><span class="pre">UUIDField</span></code> primary keys work correctly (<a class="reference external" href="https://code.djangoproject.com/ticket/24698">#24698</a>,
<a class="reference external" href="https://code.djangoproject.com/ticket/24712">#24712</a>).</li>
<li>Fixed <code class="docutils literal"><span class="pre">isnull</span></code> lookup for <code class="docutils literal"><span class="pre">HStoreField</span></code> (<a class="reference external" href="https://code.djangoproject.com/ticket/24751">#24751</a>).</li>
<li>Fixed a MySQL crash when a migration removes a combined index (unique_together
or index_together) containing a foreign key (<a class="reference external" href="https://code.djangoproject.com/ticket/24757">#24757</a>).</li>
<li>Fixed session cookie deletion when using <a class="reference internal" href="../ref/settings.html#std:setting-SESSION_COOKIE_DOMAIN"><code class="xref std std-setting docutils literal"><span class="pre">SESSION_COOKIE_DOMAIN</span></code></a>
(<a class="reference external" href="https://code.djangoproject.com/ticket/24799">#24799</a>).</li>
<li>On PostgreSQL, when no access is granted for the <code class="docutils literal"><span class="pre">postgres</span></code> database,
Django now falls back to the default database when it normally requires a
&#8220;no database&#8221; connection (<a class="reference external" href="https://code.djangoproject.com/ticket/24791">#24791</a>).</li>
<li>Fixed display of <code class="docutils literal"><span class="pre">contrib.admin</span></code>’s <code class="docutils literal"><span class="pre">ForeignKey</span></code> widget when it&#8217;s used
in a row with other fields (<a class="reference external" href="https://code.djangoproject.com/ticket/24784">#24784</a>).</li>
</ul>
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<li><a class="reference internal" href="#fixed-session-flushing-in-the-cached-db-backend">Fixed session flushing in the <code class="docutils literal"><span class="pre">cached_db</span></code> backend</a></li>
<li><a class="reference internal" href="#bugfixes">Bugfixes</a></li>
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