Remove references to unsupported Django versions in docs and code (#5602)

Per the trove classifiers, DRF only supports Django versions 1.10+. Can
drop documentation, code comments, and workarounds for older Django
versions.

Author: jdufresne

docs/api-guide/fields.md

@@ -356,8 +356,6 @@ Corresponds to `django.db.models.fields.DurationField`
 The `validated_data` for these fields will contain a `datetime.timedelta` instance.
 The representation is a string following this format `'[DD] [HH:[MM:]]ss[.uuuuuu]'`.
 
-**Note:** This field is only available with Django versions >= 1.8.
-
 **Signature:** `DurationField()`
 
 ---
@@ -681,4 +679,4 @@ The [django-rest-framework-hstore][django-rest-framework-hstore] package provide
 [django-rest-framework-gis]: https://github.com/djangonauts/django-rest-framework-gis
 [django-rest-framework-hstore]: https://github.com/djangonauts/django-rest-framework-hstore
 [django-hstore]: https://github.com/djangonauts/django-hstore
-[python-decimal-rounding-modes]: https://docs.python.org/3/library/decimal.html#rounding-modes
+[python-decimal-rounding-modes]: https://docs.python.org/3/library/decimal.html#rounding-modes

docs/index.md

@@ -120,10 +120,10 @@ If you're intending to use the browsable API you'll probably also want to add RE
 
     urlpatterns = [
         ...
-        url(r'^api-auth/', include('rest_framework.urls', namespace='rest_framework'))
+        url(r'^api-auth/', include('rest_framework.urls'))
     ]
 
-Note that the URL path can be whatever you want, but you must include `'rest_framework.urls'` with the `'rest_framework'` namespace. You may leave out the namespace in Django 1.9+, and REST framework will set it for you.
+Note that the URL path can be whatever you want.
 
 ## Example
 

docs/tutorial/1-serialization.md

@@ -48,8 +48,6 @@ We'll need to add our new `snippets` app and the `rest_framework` app to `INSTAL
         'snippets.apps.SnippetsConfig',
     )
 
-Please note that if you're using Django <1.9, you need to replace `snippets.apps.SnippetsConfig` with `snippets`.
-
 Okay, we're ready to roll.
 
 ## Creating a model to work with

docs/tutorial/4-authentication-and-permissions.md

@@ -142,11 +142,10 @@ Add the following import at the top of the file:
 And, at the end of the file, add a pattern to include the login and logout views for the browsable API.
 
     urlpatterns += [
-        url(r'^api-auth/', include('rest_framework.urls',
-                                   namespace='rest_framework')),
+        url(r'^api-auth/', include('rest_framework.urls'),
     ]
 
-The `r'^api-auth/'` part of pattern can actually be whatever URL you want to use.  The only restriction is that the included urls must use the `'rest_framework'` namespace. In Django 1.9+, REST framework will set the namespace, so you may leave it out.
+The `r'^api-auth/'` part of pattern can actually be whatever URL you want to use.
 
 Now if you open up the browser again and refresh the page you'll see a 'Login' link in the top right of the page.  If you log in as one of the users you created earlier, you'll be able to create code snippets again.
 

rest_framework/authtoken/serializers.py

@@ -20,14 +20,10 @@ def validate(self, attrs):
             user = authenticate(request=self.context.get('request'),
                                 username=username, password=password)
 
-            if user:
-                # From Django 1.10 onwards the `authenticate` call simply
-                # returns `None` for is_active=False users.
-                # (Assuming the default `ModelBackend` authentication backend.)
-                if not user.is_active:
-                    msg = _('User account is disabled.')
-                    raise serializers.ValidationError(msg, code='authorization')
-            else:
+            # The authenticate call simply returns None for is_active=False
+            # users. (Assuming the default ModelBackend authentication
+            # backend.)
+            if not user:
                 msg = _('Unable to log in with provided credentials.')
                 raise serializers.ValidationError(msg, code='authorization')
         else:

rest_framework/renderers.py

@@ -666,7 +666,7 @@ def get_context(self, data, accepted_media_type, renderer_context):
             paginator = None
 
         csrf_cookie_name = settings.CSRF_COOKIE_NAME
-        csrf_header_name = getattr(settings, 'CSRF_HEADER_NAME', 'HTTP_X_CSRFToken')  # Fallback for Django 1.8
+        csrf_header_name = settings.CSRF_HEADER_NAME
         if csrf_header_name.startswith('HTTP_'):
             csrf_header_name = csrf_header_name[5:]
         csrf_header_name = csrf_header_name.replace('_', '-')

rest_framework/urls.py

@@ -6,11 +6,10 @@
 
     urlpatterns = [
         ...
-        url(r'^auth/', include('rest_framework.urls', namespace='rest_framework'))
+        url(r'^auth/', include('rest_framework.urls'))
     ]
 
-In Django versions older than 1.9, the urls must be namespaced as 'rest_framework',
-and you should make sure your authentication settings include `SessionAuthentication`.
+You should make sure your authentication settings include `SessionAuthentication`.
 """
 from __future__ import unicode_literals
 

rest_framework/utils/model_meta.py

@@ -105,18 +105,13 @@ def _get_reverse_relationships(opts):
     """
     Returns an `OrderedDict` of field names to `RelationInfo`.
     """
-    # Note that we have a hack here to handle internal API differences for
-    # this internal API across Django 1.7 -> Django 1.8.
-    # See: https://code.djangoproject.com/ticket/24208
-
     reverse_relations = OrderedDict()
     all_related_objects = [r for r in opts.related_objects if not r.field.many_to_many]
     for relation in all_related_objects:
         accessor_name = relation.get_accessor_name()
-        related = getattr(relation, 'related_model', relation.model)
         reverse_relations[accessor_name] = RelationInfo(
             model_field=None,
-            related_model=related,
+            related_model=relation.related_model,
             to_many=relation.field.remote_field.multiple,
             to_field=_get_to_field(relation.field),
             has_through_model=False,
@@ -127,10 +122,9 @@ def _get_reverse_relationships(opts):
     all_related_many_to_many_objects = [r for r in opts.related_objects if r.field.many_to_many]
     for relation in all_related_many_to_many_objects:
         accessor_name = relation.get_accessor_name()
-        related = getattr(relation, 'related_model', relation.model)
         reverse_relations[accessor_name] = RelationInfo(
             model_field=None,
-            related_model=related,
+            related_model=relation.related_model,
             to_many=True,
             # manytomany do not have to_fields
             to_field=None,

tests/test_atomic_requests.py

@@ -120,13 +120,12 @@ def test_api_exception_rollback_transaction(self):
         Transaction is rollbacked by our transaction atomic block.
         """
         request = factory.post('/')
-        num_queries = (4 if getattr(connection.features,
-                                    'can_release_savepoints', False) else 3)
+        num_queries = 4 if connection.features.can_release_savepoints else 3
         with self.assertNumQueries(num_queries):
             # 1 - begin savepoint
             # 2 - insert
             # 3 - rollback savepoint
-            # 4 - release savepoint (django>=1.8 only)
+            # 4 - release savepoint
             with transaction.atomic():
                 response = self.view(request)
                 assert transaction.get_rollback()

tests/test_fields.py

@@ -5,7 +5,6 @@
 import uuid
 from decimal import ROUND_DOWN, ROUND_UP, Decimal
 
-import django
 import pytest
 from django.http import QueryDict
 from django.test import TestCase, override_settings
@@ -1197,11 +1196,6 @@ class TestDateTimeField(FieldValues):
     field = serializers.DateTimeField(default_timezone=utc)
 
 
-if django.VERSION[:2] <= (1, 8):
-    # Doesn't raise an error on earlier versions of Django
-    TestDateTimeField.invalid_inputs.pop('2018-08-16 22:00-24:00')
-
-
 class TestCustomInputFormatDateTimeField(FieldValues):
     """
     Valid and invalid values for `DateTimeField` with a custom input format.

tests/test_filters.py

@@ -1,9 +1,7 @@
 from __future__ import unicode_literals
 
 import datetime
-import unittest
 
-import django
 import pytest
 from django.core.exceptions import ImproperlyConfigured
 from django.db import models
@@ -291,7 +289,6 @@ def setUpTestData(cls):
         Entry.objects.create(blog=b2, headline='Something unrelated', pub_date=datetime.date(1979, 1, 1))
         Entry.objects.create(blog=b2, headline='Retrospective on Lennon', pub_date=datetime.date(1990, 6, 1))
 
-    @unittest.skipIf(django.VERSION < (1, 9), "Django 1.8 does not support transforms")
     def test_multiple_filter_conditions(self):
         class SearchListView(generics.ListAPIView):
             queryset = Blog.objects.all()