Version 3.11 (#7083)

* Version 3.11

* Added notes on OpenAPI changes for 3.11.

* Minor docs tweaking

* Update package version and supported versions

* Use a lazy import for django.test.client.encode_mutlipart. Closes #7078

README.md

@@ -54,8 +54,8 @@ There is a live example API for testing purposes, [available here][sandbox].
 
 # Requirements
 
-* Python (3.5, 3.6, 3.7)
-* Django (1.11, 2.0, 2.1, 2.2)
+* Python (3.5, 3.6, 3.7, 3.8)
+* Django (1.11, 2.0, 2.1, 2.2, 3.0)
 
 We **highly recommend** and only officially support the latest patch release of
 each Python and Django series.

docs/community/3.10-announcement.md

@@ -144,4 +144,4 @@ continued development by **[signing up for a paid plan][funding]**.
 
 [legacy-core-api-docs]:https://github.com/encode/django-rest-framework/blob/master/docs/coreapi/index.md
 [sponsors]: https://fund.django-rest-framework.org/topics/funding/#our-sponsors
-[funding]: community/funding.md
+[funding]: funding.md

docs/community/3.11-announcement.md

@@ -0,0 +1,117 @@
+<style>
+.promo li a {
+    float: left;
+    width: 130px;
+    height: 20px;
+    text-align: center;
+    margin: 10px 30px;
+    padding: 150px 0 0 0;
+    background-position: 0 50%;
+    background-size: 130px auto;
+    background-repeat: no-repeat;
+    font-size: 120%;
+    color: black;
+}
+.promo li {
+    list-style: none;
+}
+</style>
+
+# Django REST framework 3.11
+
+The 3.11 release adds support for Django 3.0.
+
+* Our supported Python versions are now: 3.5, 3.6, 3.7, and 3.8.
+* Our supported Django versions are now: 1.11, 2.0, 2.1, 2.2, and 3.0.
+
+This release will be the last to support Python 3.5 or Django 1.11.
+
+## OpenAPI Schema Generation Improvements
+
+The OpenAPI schema generation continues to mature. Some highlights in 3.11
+include:
+
+* Automatic mapping of Django REST Framework renderers and parsers into OpenAPI
+  request and response media-types.
+* Improved mapping JSON schema mapping types, for example in HStoreFields, and
+  with large integer values.
+* Porting of the old CoreAPI parsing of docstrings to form OpenAPI operation
+  descriptions.
+
+In this example view operation descriptions for the `get` and `post` methods will
+be extracted from the class docstring:
+
+```python
+class DocStringExampleListView(APIView):
+"""
+get: A description of my GET operation.
+post: A description of my POST operation.
+"""
+    permission_classes = [permissions.IsAuthenticatedOrReadOnly]
+
+    def get(self, request, *args, **kwargs):
+        ...
+
+    def post(self, request, *args, **kwargs):
+        ...
+```
+
+## Validator / Default Context
+
+In some circumstances a Validator class or a Default class may need to access the serializer field with which it is called, or the `.context` with which the serializer was instantiated. In particular:
+
+* Uniqueness validators need to be able to determine the name of the field to which they are applied, in order to run an appropriate database query.
+* The `CurrentUserDefault` needs to be able to determine the context with which the serializer was instantiated, in order to return the current user instance.
+
+Previous our approach to this was that implementations could include a `set_context` method, which would be called prior to validation. However this approach had issues with potential race conditions. We have now move this approach into a pending deprecation state. It will continue to function, but will be escalated to a deprecated state in 3.12, and removed entirely in 3.13.
+
+Instead, validators or defaults which require the serializer context, should include a `requires_context = True` attribute on the class.
+
+The `__call__` method should then include an additional `serializer_field` argument.
+
+Validator implementations will look like this:
+
+```python
+class CustomValidator:
+    requires_context = True
+
+    def __call__(self, value, serializer_field):
+        ...
+```
+
+Default implementations will look like this:
+
+```python
+class CustomDefault:
+    requires_context = True
+
+    def __call__(self, serializer_field):
+        ...
+```
+
+---
+
+## Funding
+
+REST framework is a *collaboratively funded project*. If you use
+REST framework commercially we strongly encourage you to invest in its
+continued development by **[signing up for a paid plan][funding]**.
+
+*Every single sign-up helps us make REST framework long-term financially sustainable.*
+
+<ul class="premium-promo promo">
+    <li><a href="https://getsentry.com/welcome/" style="background-image: url(https://fund-rest-framework.s3.amazonaws.com/sentry130.png)">Sentry</a></li>
+    <li><a href="https://getstream.io/try-the-api/?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>
+    <li><a href="https://software.esg-usa.com" style="background-image: url(https://fund-rest-framework.s3.amazonaws.com/esg-new-logo.png)">ESG</a></li>
+    <li><a href="https://rollbar.com" style="background-image: url(https://fund-rest-framework.s3.amazonaws.com/rollbar2.png)">Rollbar</a></li>
+    <li><a href="https://cadre.com" style="background-image: url(https://fund-rest-framework.s3.amazonaws.com/cadre.png)">Cadre</a></li>
+    <li><a href="https://hubs.ly/H0f30Lf0" style="background-image: url(https://fund-rest-framework.s3.amazonaws.com/kloudless-plus-text.png)">Kloudless</a></li>
+    <li><a href="https://lightsonsoftware.com" style="background-image: url(https://fund-rest-framework.s3.amazonaws.com/lightson-dark.png)">Lights On Software</a></li>
+    <li><a href="https://retool.com/?utm_source=djangorest&utm_medium=sponsorship" style="background-image: url(https://fund-rest-framework.s3.amazonaws.com/retool-sidebar.png)">Retool</a></li>
+</ul>
+<div style="clear: both; padding-bottom: 20px;"></div>
+
+*Many thanks to all our [wonderful sponsors][sponsors], and in particular to our premium backers, [Sentry](https://getsentry.com/welcome/), [Stream](https://getstream.io/?utm_source=drf&utm_medium=banner&utm_campaign=drf), [ESG](https://software.esg-usa.com/), [Rollbar](https://rollbar.com/?utm_source=django&utm_medium=sponsorship&utm_campaign=freetrial), [Cadre](https://cadre.com), [Kloudless](https://hubs.ly/H0f30Lf0), [Lights On Software](https://lightsonsoftware.com), and [Retool](https://retool.com/?utm_source=djangorest&utm_medium=sponsorship).*
+
+[sponsors]: https://fund.django-rest-framework.org/topics/funding/#our-sponsors
+[funding]: funding.md

docs/index.md

@@ -52,7 +52,7 @@ Some reasons you might want to use REST framework:
 * [Authentication policies][authentication] including packages for [OAuth1a][oauth1-section] and [OAuth2][oauth2-section].
 * [Serialization][serializers] that supports both [ORM][modelserializer-section] and [non-ORM][serializer-section] data sources.
 * Customizable all the way down - just use [regular function-based views][functionview-section] if you don't need the [more][generic-views] [powerful][viewsets] [features][routers].
-* [Extensive documentation][index], and [great community support][group].
+* Extensive documentation, and [great community support][group].
 * Used and trusted by internationally recognised companies including [Mozilla][mozilla], [Red Hat][redhat], [Heroku][heroku], and [Eventbrite][eventbrite].
 
 ---
@@ -85,8 +85,8 @@ continued development by **[signing up for a paid plan][funding]**.
 
 REST framework requires the following:
 
-* Python (3.5, 3.6, 3.7)
-* Django (1.11, 2.0, 2.1, 2.2)
+* Python (3.5, 3.6, 3.7, 3.8)
+* Django (1.11, 2.0, 2.1, 2.2, 3.0)
 
 We **highly recommend** and only officially support the latest patch release of
 each Python and Django series.

mkdocs.yml

@@ -66,6 +66,7 @@ nav:
      - 'Contributing to REST framework': 'community/contributing.md'
      - 'Project management': 'community/project-management.md'
      - 'Release Notes': 'community/release-notes.md'
+     - '3.11 Announcement': 'community/3.11-announcement.md'
      - '3.10 Announcement': 'community/3.10-announcement.md'
      - '3.9 Announcement': 'community/3.9-announcement.md'
      - '3.8 Announcement': 'community/3.8-announcement.md'

rest_framework/__init__.py

@@ -8,7 +8,7 @@
 """
 
 __title__ = 'Django REST framework'
-__version__ = '3.10.3'
+__version__ = '3.11.0'
 __author__ = 'Tom Christie'
 __license__ = 'BSD 3-Clause'
 __copyright__ = 'Copyright 2011-2019 Encode OSS Ltd'

rest_framework/renderers.py

@@ -16,7 +16,6 @@
 from django.core.paginator import Page
 from django.http.multipartparser import parse_header
 from django.template import engines, loader
-from django.test.client import encode_multipart
 from django.urls import NoReverseMatch
 from django.utils.html import mark_safe
 
@@ -902,6 +901,8 @@ class MultiPartRenderer(BaseRenderer):
     BOUNDARY = 'BoUnDaRyStRiNg'
 
     def render(self, data, accepted_media_type=None, renderer_context=None):
+        from django.test.client import encode_multipart
+
         if hasattr(data, 'items'):
             for key, value in data.items():
                 assert not isinstance(value, dict), (