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<h1 id="django-rest-framework-34"><a class="toclink" href="#django-rest-framework-34">Django REST framework 3.4</a></h1>
<p>The 3.4 release is the first in a planned series that will be addressing schema
generation, hypermedia support, API clients, and finally realtime support.</p>
<hr />
<h2 id="funding"><a class="toclink" href="#funding">Funding</a></h2>
<p>The 3.4 release has been made possible a recent <a href="../mozilla-grant/">Mozilla grant</a>, and by our
<a href="../funding/">collaborative funding model</a>. If you use REST framework commercially, and would
like to see this work continue, we strongly encourage you to invest in its
continued development by <strong><a href="../funding/">signing up for a paid plan</a></strong>.</p>
<p>The initial aim is to provide a single full-time position on REST framework.
Right now we're over 60% of the way towards achieving that.
<em>Every single sign-up makes a significant impact.</em></p>
<ul class="premium-promo promo">
<li><a href="https://www.rover.com/careers/" style="background-image: url(https://fund-rest-framework.s3.amazonaws.com/rover_130x130.png)">Rover.com</a></li>
<li><a href="https://sentry.io/welcome/" style="background-image: url(https://fund-rest-framework.s3.amazonaws.com/sentry130.png)">Sentry</a></li>
<li><a href="https://getstream.io/?utm_source=drf&utm_medium=banner&utm_campaign=drf" style="background-image: url(https://fund-rest-framework.s3.amazonaws.com/stream-130.png)">Stream</a></li>
</ul>
<div style="clear: both; padding-bottom: 20px;"></div>
<p><em>Many thanks to all our <a href="https://fund.django-rest-framework.org/topics/funding/#our-sponsors">awesome sponsors</a>, and in particular to our premium backers, <a href="https://www.rover.com/careers/">Rover</a>, <a href="https://sentry.io/welcome/">Sentry</a>, and <a href="https://getstream.io/?utm_source=drf&amp;utm_medium=banner&amp;utm_campaign=drf">Stream</a>.</em></p>
<hr />
<h2 id="schemas-client-libraries"><a class="toclink" href="#schemas-client-libraries">Schemas &amp; client libraries</a></h2>
<p>REST framework 3.4 brings built-in support for generating API schemas.</p>
<p>We provide this support by using <a href="https://www.coreapi.org/">Core API</a>, a Document Object Model
for describing APIs.</p>
<p>Because Core API represents the API schema in an format-independent
manner, we're able to render the Core API <code>Document</code> object into many different
schema formats, by allowing the renderer class to determine how the internal
representation maps onto the external schema format.</p>
<p>This approach should also open the door to a range of auto-generated API
documentation options in the future, by rendering the <code>Document</code> object into
HTML documentation pages.</p>
<p>Alongside the built-in schema support, we're also now providing the following:</p>
<ul>
<li>A <a href="../api-clients#command-line-client">command line tool</a> for interacting with APIs.</li>
<li>A <a href="../api-clients#python-client-library">Python client library</a> for interacting with APIs.</li>
</ul>
<p>These API clients are dynamically driven, and able to interact with any API
that exposes a supported schema format.</p>
<p>Dynamically driven clients allow you to interact with an API at an application
layer interface, rather than a network layer interface, while still providing
the benefits of RESTful Web API design.</p>
<p>We're expecting to expand the range of languages that we provide client libraries
for over the coming months.</p>
<p>Further work on maturing the API schema support is also planned, including
documentation on supporting file upload and download, and improved support for
documentation generation and parameter annotation.</p>
<hr />
<p>Current support for schema formats is as follows:</p>
<table>
<thead>
<tr>
<th>Name</th>
<th>Support</th>
<th>PyPI package</th>
</tr>
</thead>
<tbody>
<tr>
<td><a href="https://www.coreapi.org/specification/encoding/#core-json-encoding">Core JSON</a></td>
<td>Schema generation &amp; client support.</td>
<td>Built-in support in <code>coreapi</code>.</td>
</tr>
<tr>
<td><a href="https://openapis.org/specification">Swagger / OpenAPI</a></td>
<td>Schema generation &amp; client support.</td>
<td>The <code>openapi-codec</code> package.</td>
</tr>
<tr>
<td><a href="https://json-schema.org/latest/json-schema-hypermedia.html">JSON Hyper-Schema</a></td>
<td>Currently client support only.</td>
<td>The <code>hyperschema-codec</code> package.</td>
</tr>
<tr>
<td><a href="https://apiblueprint.org/">API Blueprint</a></td>
<td>Not yet available.</td>
<td>Not yet available.</td>
</tr>
</tbody>
</table>
<hr />
<p>You can read more about any of this new functionality in the following:</p>
<ul>
<li>New tutorial section on <a href="../../tutorial/7-schemas-and-client-libraries/">schemas &amp; client libraries</a>.</li>
<li>Documentation page on <a href="../../api-guide/schemas/">schema generation</a>.</li>
<li>Topic page on <a href="../../topics/api-clients/">API clients</a>.</li>
</ul>
<p>It is also worth noting that Marc Gibbons is currently working towards a 2.0 release of
the popular Django REST Swagger package, which will tie in with our new built-in support.</p>
<hr />
<h2 id="supported-versions"><a class="toclink" href="#supported-versions">Supported versions</a></h2>
<p>The 3.4.0 release adds support for Django 1.10.</p>
<p>The following versions of Python and Django are now supported:</p>
<ul>
<li>Django versions 1.8, 1.9, and 1.10.</li>
<li>Python versions 2.7, 3.2(*), 3.3(*), 3.4, 3.5.</li>
</ul>
<p>(*) Note that Python 3.2 and 3.3 are not supported from Django 1.9 onwards.</p>
<hr />
<h2 id="deprecations-and-changes"><a class="toclink" href="#deprecations-and-changes">Deprecations and changes</a></h2>
<p>The 3.4 release includes very limited deprecation or behavioral changes, and
should present a straightforward upgrade.</p>
<h3 id="use-fields-or-exclude-on-serializer-classes"><a class="toclink" href="#use-fields-or-exclude-on-serializer-classes">Use fields or exclude on serializer classes.</a></h3>
<p>The following change in 3.3.0 is now escalated from "pending deprecation" to
"deprecated". Its usage will continue to function but will raise warnings:</p>
<p><code>ModelSerializer</code> and <code>HyperlinkedModelSerializer</code> should include either a <code>fields</code>
option, or an <code>exclude</code> option. The <code>fields = '__all__'</code> shortcut may be used
to explicitly include all fields.</p>
<h3 id="microsecond-precision-when-returning-time-or-datetime"><a class="toclink" href="#microsecond-precision-when-returning-time-or-datetime">Microsecond precision when returning time or datetime.</a></h3>
<p>Using the default JSON renderer and directly returning a <code>datetime</code> or <code>time</code>
instance will now render with microsecond precision (6 digits), rather than
millisecond precision (3 digits). This makes the output format consistent with the
default string output of <code>serializers.DateTimeField</code> and <code>serializers.TimeField</code>.</p>
<p>This change <em>does not affect the default behavior when using serializers</em>,
which is to serialize <code>datetime</code> and <code>time</code> instances into strings with
microsecond precision.</p>
<p>The serializer behavior can be modified if needed, using the <code>DATETIME_FORMAT</code>
and <code>TIME_FORMAT</code> settings.</p>
<p>The renderer behavior can be modified by setting a custom <code>encoder_class</code>
attribute on a <code>JSONRenderer</code> subclass.</p>
<h3 id="relational-choices-no-longer-displayed-in-options-requests"><a class="toclink" href="#relational-choices-no-longer-displayed-in-options-requests">Relational choices no longer displayed in OPTIONS requests.</a></h3>
<p>Making an <code>OPTIONS</code> request to views that have a serializer choice field
will result in a list of the available choices being returned in the response.</p>
<p>In cases where there is a relational field, the previous behavior would be
to return a list of available instances to choose from for that relational field.</p>
<p>In order to minimise exposed information the behavior now is to <em>not</em> return
choices information for relational fields.</p>
<p>If you want to override this new behavior you'll need to <a href="../../api-guide/metadata/#custom-metadata-classes">implement a custom
metadata class</a>.</p>
<p>See <a href="https://github.com/encode/django-rest-framework/issues/3751">issue #3751</a> for more information on this behavioral change.</p>
<hr />
<h2 id="other-improvements"><a class="toclink" href="#other-improvements">Other improvements</a></h2>
<p>This release includes further work from a huge number of <a href="https://github.com/encode/django-rest-framework/milestone/35">pull requests and issues</a>.</p>
<p>Many thanks to all our contributors who've been involved in the release, either through raising issues, giving feedback, improving the documentation, or suggesting and implementing code changes.</p>
<p>The full set of itemized release notes <a href="../release-notes#34">are available here</a>.</p>
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