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<div class="yui-g" id="releases-0.96">
<div class="section" id="s-django-version-0-96-release-notes">
<span id="django-version-0-96-release-notes"></span><h1>Django version 0.96 release notes<a class="headerlink" href="#django-version-0-96-release-notes" title="Permalink to this headline">¶</a></h1>
<p>Welcome to Django 0.96!</p>
<p>The primary goal for 0.96 is a cleanup and stabilization of the features
introduced in 0.95. There have been a few small <a class="reference internal" href="#backwards-incompatible-changes">backwards-incompatible
changes</a> since 0.95, but the upgrade process should be fairly simple
and should not require major changes to existing applications.</p>
<p>However, we’re also releasing 0.96 now because we have a set of
backwards-incompatible changes scheduled for the near future. Once
completed, they will involve some code changes for application
developers, so we recommend that you stick with Django 0.96 until the
next official release; then you’ll be able to upgrade in one step
instead of needing to make incremental changes to keep up with the
development version of Django.</p>
<div class="section" id="s-backwards-incompatible-changes">
<span id="backwards-incompatible-changes"></span><h2>Backwards-incompatible changes<a class="headerlink" href="#backwards-incompatible-changes" title="Permalink to this headline">¶</a></h2>
<p>The following changes may require you to update your code when you switch from
0.95 to 0.96:</p>
<div class="section" id="s-mysqldb-version-requirement">
<span id="mysqldb-version-requirement"></span><h3><tt class="docutils literal"><span class="pre">MySQLdb</span></tt> version requirement<a class="headerlink" href="#mysqldb-version-requirement" title="Permalink to this headline">¶</a></h3>
<p>Due to a bug in older versions of the <tt class="docutils literal"><span class="pre">MySQLdb</span></tt> Python module (which
Django uses to connect to MySQL databases), Django’s MySQL backend now
requires version 1.2.1p2 or higher of <tt class="docutils literal"><span class="pre">MySQLdb</span></tt>, and will raise
exceptions if you attempt to use an older version.</p>
<p>If you’re currently unable to upgrade your copy of <tt class="docutils literal"><span class="pre">MySQLdb</span></tt> to meet
this requirement, a separate, backwards-compatible backend, called
“mysql_old”, has been added to Django. To use this backend, change
the <a class="reference internal" href="../ref/settings.html#std:setting-DATABASE_ENGINE"><tt class="xref std std-setting docutils literal"><span class="pre">DATABASE_ENGINE</span></tt></a> setting in your Django settings file from
this:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="n">DATABASE_ENGINE</span> <span class="o">=</span> <span class="s">"mysql"</span>
</pre></div>
</div>
<p>to this:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="n">DATABASE_ENGINE</span> <span class="o">=</span> <span class="s">"mysql_old"</span>
</pre></div>
</div>
<p>However, we strongly encourage MySQL users to upgrade to a more recent
version of <tt class="docutils literal"><span class="pre">MySQLdb</span></tt> as soon as possible, The "mysql_old" backend is
provided only to ease this transition, and is considered deprecated;
aside from any necessary security fixes, it will not be actively
maintained, and it will be removed in a future release of Django.</p>
<p>Also, note that some features, like the new <a class="reference internal" href="../ref/settings.html#std:setting-DATABASE_OPTIONS"><tt class="xref std std-setting docutils literal"><span class="pre">DATABASE_OPTIONS</span></tt></a>
setting (see the <a class="reference external" href="http://www.djangoproject.com/documentation/0.96/databases/">databases documentation</a> for details), are only
available on the "mysql" backend, and will not be made available for
"mysql_old".</p>
</div>
<div class="section" id="s-database-constraint-names-changed">
<span id="database-constraint-names-changed"></span><h3>Database constraint names changed<a class="headerlink" href="#database-constraint-names-changed" title="Permalink to this headline">¶</a></h3>
<p>The format of the constraint names Django generates for foreign key
references have changed slightly. These names are generally only used
when it is not possible to put the reference directly on the affected
column, so they are not always visible.</p>
<p>The effect of this change is that running <tt class="docutils literal"><span class="pre">manage.py</span> <span class="pre">reset</span></tt> and
similar commands against an existing database may generate SQL with
the new form of constraint name, while the database itself contains
constraints named in the old form; this will cause the database server
to raise an error message about modifying non-existent constraints.</p>
<p>If you need to work around this, there are two methods available:</p>
<ol class="arabic simple">
<li>Redirect the output of <tt class="docutils literal"><span class="pre">manage.py</span></tt> to a file, and edit the
generated SQL to use the correct constraint names before
executing it.</li>
<li>Examine the output of <tt class="docutils literal"><span class="pre">manage.py</span> <span class="pre">sqlall</span></tt> to see the new-style
constraint names, and use that as a guide to rename existing
constraints in your database.</li>
</ol>
</div>
<div class="section" id="s-name-changes-in-manage-py">
<span id="name-changes-in-manage-py"></span><h3>Name changes in <tt class="docutils literal"><span class="pre">manage.py</span></tt><a class="headerlink" href="#name-changes-in-manage-py" title="Permalink to this headline">¶</a></h3>
<p>A few of the options to <tt class="docutils literal"><span class="pre">manage.py</span></tt> have changed with the addition of fixture
support:</p>
<ul class="simple">
<li>There are new <tt class="docutils literal"><span class="pre">dumpdata</span></tt> and <tt class="docutils literal"><span class="pre">loaddata</span></tt> commands which, as
you might expect, will dump and load data to/from the
database. These commands can operate against any of Django's
supported serialization formats.</li>
<li>The <tt class="docutils literal"><span class="pre">sqlinitialdata</span></tt> command has been renamed to <tt class="docutils literal"><span class="pre">sqlcustom</span></tt> to
emphasize that <tt class="docutils literal"><span class="pre">loaddata</span></tt> should be used for data (and <tt class="docutils literal"><span class="pre">sqlcustom</span></tt> for
other custom SQL -- views, stored procedures, etc.).</li>
<li>The vestigial <tt class="docutils literal"><span class="pre">install</span></tt> command has been removed. Use <tt class="docutils literal"><span class="pre">syncdb</span></tt>.</li>
</ul>
</div>
<div class="section" id="s-backslash-escaping-changed">
<span id="backslash-escaping-changed"></span><h3>Backslash escaping changed<a class="headerlink" href="#backslash-escaping-changed" title="Permalink to this headline">¶</a></h3>
<p>The Django database API now escapes backslashes given as query parameters. If
you have any database API code that matches backslashes, and it was working before
(despite the lack of escaping), you'll have to change your code to "unescape" the
slashes one level.</p>
<p>For example, this used to work:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="c"># Find text containing a single backslash</span>
<span class="n">MyModel</span><span class="o">.</span><span class="n">objects</span><span class="o">.</span><span class="n">filter</span><span class="p">(</span><span class="n">text__contains</span><span class="o">=</span><span class="s">'</span><span class="se">\\\\</span><span class="s">'</span><span class="p">)</span>
</pre></div>
</div>
<p>The above is now incorrect, and should be rewritten as:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="c"># Find text containing a single backslash</span>
<span class="n">MyModel</span><span class="o">.</span><span class="n">objects</span><span class="o">.</span><span class="n">filter</span><span class="p">(</span><span class="n">text__contains</span><span class="o">=</span><span class="s">'</span><span class="se">\\</span><span class="s">'</span><span class="p">)</span>
</pre></div>
</div>
</div>
<div class="section" id="s-removed-enable-psyco-setting">
<span id="removed-enable-psyco-setting"></span><h3>Removed ENABLE_PSYCO setting<a class="headerlink" href="#removed-enable-psyco-setting" title="Permalink to this headline">¶</a></h3>
<p>The <tt class="docutils literal"><span class="pre">ENABLE_PSYCO</span></tt> setting no longer exists. If your settings file includes
<tt class="docutils literal"><span class="pre">ENABLE_PSYCO</span></tt> it will have no effect; to use <a class="reference external" href="http://psyco.sourceforge.net/">Psyco</a>, we recommend
writing a middleware class to activate it.</p>
</div>
</div>
<div class="section" id="s-what-s-new-in-0-96">
<span id="what-s-new-in-0-96"></span><h2>What's new in 0.96?<a class="headerlink" href="#what-s-new-in-0-96" title="Permalink to this headline">¶</a></h2>
<p>This revision represents over a thousand source commits and over four hundred
bug fixes, so we can't possibly catalog all the changes. Here, we describe the
most notable changes in this release.</p>
<div class="section" id="s-new-forms-library">
<span id="new-forms-library"></span><h3>New forms library<a class="headerlink" href="#new-forms-library" title="Permalink to this headline">¶</a></h3>
<p><tt class="docutils literal"><span class="pre">django.newforms</span></tt> is Django's new form-handling library. It's a
replacement for <tt class="docutils literal"><span class="pre">django.forms</span></tt>, the old form/manipulator/validation
framework. Both APIs are available in 0.96, but over the next two
releases we plan to switch completely to the new forms system, and
deprecate and remove the old system.</p>
<p>There are three elements to this transition:</p>
<ul>
<li><p class="first">We've copied the current <tt class="docutils literal"><span class="pre">django.forms</span></tt> to
<tt class="docutils literal"><span class="pre">django.oldforms</span></tt>. This allows you to upgrade your code <em>now</em>
rather than waiting for the backwards-incompatible change and
rushing to fix your code after the fact. Just change your
import statements like this:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">django</span> <span class="kn">import</span> <span class="n">forms</span> <span class="c"># 0.95-style</span>
<span class="kn">from</span> <span class="nn">django</span> <span class="kn">import</span> <span class="n">oldforms</span> <span class="k">as</span> <span class="n">forms</span> <span class="c"># 0.96-style</span>
</pre></div>
</div>
</li>
<li><p class="first">The next official release of Django will move the current
<tt class="docutils literal"><span class="pre">django.newforms</span></tt> to <tt class="docutils literal"><span class="pre">django.forms</span></tt>. This will be a
backwards-incompatible change, and anyone still using the old
version of <tt class="docutils literal"><span class="pre">django.forms</span></tt> at that time will need to change
their import statements as described above.</p>
</li>
<li><p class="first">The next release after that will completely remove
<tt class="docutils literal"><span class="pre">django.oldforms</span></tt>.</p>
</li>
</ul>
<p>Although the <tt class="docutils literal"><span class="pre">newforms</span></tt> library will continue to evolve, it's ready for use
for most common cases. We recommend that anyone new to form handling skip the
old forms system and start with the new.</p>
<p>For more information about <tt class="docutils literal"><span class="pre">django.newforms</span></tt>, read the <a class="reference external" href="http://www.djangoproject.com/documentation/0.96/newforms/">newforms
documentation</a>.</p>
</div>
<div class="section" id="s-urlconf-improvements">
<span id="urlconf-improvements"></span><h3>URLconf improvements<a class="headerlink" href="#urlconf-improvements" title="Permalink to this headline">¶</a></h3>
<p>You can now use any callable as the callback in URLconfs (previously, only
strings that referred to callables were allowed). This allows a much more
natural use of URLconfs. For example, this URLconf:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">django.conf.urls.defaults</span> <span class="kn">import</span> <span class="o">*</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="p">(</span><span class="s">'^myview/$'</span><span class="p">,</span> <span class="s">'mysite.myapp.views.myview'</span><span class="p">)</span>
<span class="p">)</span>
</pre></div>
</div>
<p>can now be rewritten as:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">django.conf.urls.defaults</span> <span class="kn">import</span> <span class="o">*</span>
<span class="kn">from</span> <span class="nn">mysite.myapp.views</span> <span class="kn">import</span> <span class="n">myview</span>
<span class="n">urlpatterns</span> <span class="o">=</span> <span class="n">patterns</span><span class="p">(</span><span class="s">''</span><span class="p">,</span>
<span class="p">(</span><span class="s">'^myview/$'</span><span class="p">,</span> <span class="n">myview</span><span class="p">)</span>
<span class="p">)</span>
</pre></div>
</div>
<p>One useful application of this can be seen when using decorators; this
change allows you to apply decorators to views <em>in your
URLconf</em>. Thus, you can make a generic view require login very
easily:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">django.conf.urls.defaults</span> <span class="kn">import</span> <span class="o">*</span>
<span class="kn">from</span> <span class="nn">django.contrib.auth.decorators</span> <span class="kn">import</span> <span class="n">login_required</span>
<span class="kn">from</span> <span class="nn">django.views.generic.list_detail</span> <span class="kn">import</span> <span class="n">object_list</span>
<span class="kn">from</span> <span class="nn">mysite.myapp.models</span> <span class="kn">import</span> <span class="n">MyModel</span>
<span class="n">info</span> <span class="o">=</span> <span class="p">{</span>
<span class="s">"queryset"</span> <span class="p">:</span> <span class="n">MyModel</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="p">}</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="p">(</span><span class="s">'^myview/$'</span><span class="p">,</span> <span class="n">login_required</span><span class="p">(</span><span class="n">object_list</span><span class="p">),</span> <span class="n">info</span><span class="p">)</span>
<span class="p">)</span>
</pre></div>
</div>
<p>Note that both syntaxes (strings and callables) are valid, and will continue to
be valid for the foreseeable future.</p>
</div>
<div class="section" id="s-the-test-framework">
<span id="the-test-framework"></span><h3>The test framework<a class="headerlink" href="#the-test-framework" title="Permalink to this headline">¶</a></h3>
<p>Django now includes a test framework so you can start transmuting fear into
boredom (with apologies to Kent Beck). You can write tests based on <a class="reference external" href="http://docs.python.org/library/doctest.html">doctest</a>
or <a class="reference external" href="http://docs.python.org/library/unittest.html">unittest</a> and test your views with a simple test client.</p>
<p>There is also new support for "fixtures" -- initial data, stored in any of the
supported <a class="reference external" href="http://www.djangoproject.com/documentation/0.96/serialization/">serialization formats</a>, that will be loaded into your database at the
start of your tests. This makes testing with real data much easier.</p>
<p>See <a class="reference external" href="http://www.djangoproject.com/documentation/0.96/testing/">the testing documentation</a> for the full details.</p>
</div>
<div class="section" id="s-improvements-to-the-admin-interface">
<span id="improvements-to-the-admin-interface"></span><h3>Improvements to the admin interface<a class="headerlink" href="#improvements-to-the-admin-interface" title="Permalink to this headline">¶</a></h3>
<p>A small change, but a very nice one: dedicated views for adding and
updating users have been added to the admin interface, so you no
longer need to worry about working with hashed passwords in the admin.</p>
</div>
</div>
<div class="section" id="s-thanks">
<span id="thanks"></span><h2>Thanks<a class="headerlink" href="#thanks" title="Permalink to this headline">¶</a></h2>
<p>Since 0.95, a number of people have stepped forward and taken a major
new role in Django's development. We'd like to thank these people for
all their hard work:</p>
<ul class="simple">
<li>Russell Keith-Magee and Malcolm Tredinnick for their major code
contributions. This release wouldn't have been possible without them.</li>
<li>Our new release manager, James Bennett, for his work in getting out
0.95.1, 0.96, and (hopefully) future release.</li>
<li>Our ticket managers Chris Beaven (aka SmileyChris), Simon Greenhill,
Michael Radziej, and Gary Wilson. They agreed to take on the monumental
task of wrangling our tickets into nicely cataloged submission. Figuring
out what to work on is now about a million times easier; thanks again,
guys.</li>
<li>Everyone who submitted a bug report, patch or ticket comment. We can't
possibly thank everyone by name -- over 200 developers submitted patches
that went into 0.96 -- but everyone who's contributed to Django is listed
in <a class="reference external" href="http://code.djangoproject.com/browser/django/trunk/AUTHORS">AUTHORS</a>.</li>
</ul>
</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="#">Django version 0.96 release notes</a><ul>
<li><a class="reference internal" href="#backwards-incompatible-changes">Backwards-incompatible changes</a><ul>
<li><a class="reference internal" href="#mysqldb-version-requirement"><tt class="docutils literal"><span class="pre">MySQLdb</span></tt> version requirement</a></li>
<li><a class="reference internal" href="#database-constraint-names-changed">Database constraint names changed</a></li>
<li><a class="reference internal" href="#name-changes-in-manage-py">Name changes in <tt class="docutils literal"><span class="pre">manage.py</span></tt></a></li>
<li><a class="reference internal" href="#backslash-escaping-changed">Backslash escaping changed</a></li>
<li><a class="reference internal" href="#removed-enable-psyco-setting">Removed ENABLE_PSYCO setting</a></li>
</ul>
</li>
<li><a class="reference internal" href="#what-s-new-in-0-96">What’s new in 0.96?</a><ul>
<li><a class="reference internal" href="#new-forms-library">New forms library</a></li>
<li><a class="reference internal" href="#urlconf-improvements">URLconf improvements</a></li>
<li><a class="reference internal" href="#the-test-framework">The test framework</a></li>
<li><a class="reference internal" href="#improvements-to-the-admin-interface">Improvements to the admin interface</a></li>
</ul>
</li>
<li><a class="reference internal" href="#thanks">Thanks</a></li>
</ul>
</li>
</ul>
<h3>Browse</h3>
<ul>
<li>Prev: <a href="1.0-porting-guide.html">Porting your apps from Django 0.96 to 1.0</a></li>
<li>Next: <a href="0.95.html">Django version 0.95 release notes</a></li>
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