Use compat implementations for the old meta api methods

Author: dulacp

rest_framework/compat.py

@@ -71,6 +71,30 @@ def distinct(queryset, base):
     JSONField = None
 
 
+# Models Options old meta api
+# Django 1.8 introduced the `Options.get_fields` method that can be used to
+# implement *old* meta api methods
+# See: https://docs.djangoproject.com/en/1.9/ref/models/meta/#migrating-from-the-old-api
+if django.VERSION >= (1, 8):
+    def get_all_related_objects(opts):
+        return [
+            f for f in opts.get_fields()
+            if (f.one_to_many or f.one_to_one) and f.auto_created
+        ]
+
+    def get_all_related_many_to_many_objects(opts):
+        return all_related_to_many_objects = [
+            f for f in opts.get_fields(include_hidden=True)
+            if f.many_to_many and f.auto_created
+        ]
+else:
+    def get_all_related_objects(opts):
+        return opts.get_all_related_objects()
+
+    def get_all_related_many_to_many_objects(opts):
+        return opts.get_all_related_many_to_many_objects()
+
+
 # django-filter is optional
 try:
     import django_filters

rest_framework/utils/model_meta.py

@@ -13,6 +13,10 @@
 from django.db import models
 from django.utils import six
 
+from rest_framework.compat import (
+    get_all_related_objects, get_all_related_many_to_many_objects
+)
+
 FieldInfo = namedtuple('FieldResult', [
     'pk',  # Model field instance
     'fields',  # Dict of field name -> model field instance
@@ -126,15 +130,7 @@ def _get_reverse_relationships(opts):
     # See: https://code.djangoproject.com/ticket/24208
 
     reverse_relations = OrderedDict()
-
-    # The backward implementation can be found in the Django Documentation
-    # See: https://docs.djangoproject.com/en/1.9/ref/models/meta/#migrating-from-the-old-api
-    related_objects = [
-        f for f in opts.get_fields()
-        if (f.one_to_many or f.one_to_one) and f.auto_created
-    ]
-
-    for relation in related_objects:
+    for relation in get_all_related_objects(opts):
         accessor_name = relation.get_accessor_name()
         related = getattr(relation, 'related_model', relation.model)
         reverse_relations[accessor_name] = RelationInfo(
@@ -144,15 +140,8 @@ def _get_reverse_relationships(opts):
             has_through_model=False
         )
 
-    # The backward implementation can be found in the Django Documentation
-    # See: https://docs.djangoproject.com/en/1.9/ref/models/meta/#migrating-from-the-old-api
-    all_related_to_many_objects = [
-        f for f in opts.get_fields(include_hidden=True)
-        if f.many_to_many and f.auto_created
-    ]
-
     # Deal with reverse many-to-many relationships.
-    for relation in all_related_to_many_objects:
+    for relation in get_all_related_many_to_many_objects(opts):
         accessor_name = relation.get_accessor_name()
         related = getattr(relation, 'related_model', relation.model)
         reverse_relations[accessor_name] = RelationInfo(