This attempt to fix the issues breaks tests

An attempt to fix django-json-api#859, which unfortunately breaks two tests in test_views.

Author: uliSchuster

example/tests/test_views.py

@@ -367,32 +367,32 @@ def test_get_related_instance_model_field(self):
         got = view.get_related_instance()
         self.assertEqual(got, self.author.id)
 
-    def test_get_serializer_class(self):
+    def test_get_related_serializer_class(self):
         kwargs = {'pk': self.author.id, 'related_field': 'bio'}
         view = self._get_view(kwargs)
-        got = view.get_serializer_class()
+        got = view.get_related_serializer_class()
         self.assertEqual(got, AuthorBioSerializer)
 
-    def test_get_serializer_class_many(self):
+    def test_get_related_serializer_class_many(self):
         kwargs = {'pk': self.author.id, 'related_field': 'entries'}
         view = self._get_view(kwargs)
-        got = view.get_serializer_class()
+        got = view.get_related_serializer_class()
         self.assertEqual(got, EntrySerializer)
 
     def test_get_serializer_comes_from_included_serializers(self):
         kwargs = {'pk': self.author.id, 'related_field': 'type'}
         view = self._get_view(kwargs)
         related_serializers = view.serializer_class.related_serializers
         delattr(view.serializer_class, 'related_serializers')
-        got = view.get_serializer_class()
+        got = view.get_related_serializer_class()
         self.assertEqual(got, AuthorTypeSerializer)
 
         view.serializer_class.related_serializers = related_serializers
 
-    def test_get_serializer_class_raises_error(self):
+    def test_get_related_serializer_class_raises_error(self):
         kwargs = {'pk': self.author.id, 'related_field': 'unknown'}
         view = self._get_view(kwargs)
-        self.assertRaises(NotFound, view.get_serializer_class)
+        self.assertRaises(NotFound, view.get_related_serializer_class)
 
     def test_retrieve_related_single_reverse_lookup(self):
         url = reverse('author-related', kwargs={'pk': self.author.pk, 'related_field': 'bio'})

rest_framework_json_api/views.py

@@ -144,10 +144,19 @@ def retrieve_related(self, request, *args, **kwargs):
         if isinstance(instance, Iterable):
             serializer_kwargs['many'] = True
 
-        serializer = self.get_serializer(instance, **serializer_kwargs)
+        serializer = self.get_related_serializer(instance, **serializer_kwargs)
         return Response(serializer.data)
 
-    def get_serializer_class(self):
+    def get_related_serializer(self, *args, **kwargs):
+        """
+        Return the serializer instance that should be used for validating and
+        deserializing input, and for serializing output.
+        """
+        serializer_class = self.get_related_serializer_class()
+        kwargs.setdefault('context', self.get_serializer_context())
+        return serializer_class(*args, **kwargs)
+
+    def get_related_serializer_class(self):
         parent_serializer_class = super(RelatedMixin, self).get_serializer_class()
 
         if 'related_field' in self.kwargs: