Merge pull request #2441 from linovia/bugfix/2425

Support for Django 1.8a1

Author: tomchristie

rest_framework/serializers.py

@@ -12,7 +12,7 @@
 """
 from __future__ import unicode_literals
 from django.db import models
-from django.db.models.fields import FieldDoesNotExist
+from django.db.models.fields import FieldDoesNotExist, Field as DjangoField
 from django.utils.translation import ugettext_lazy as _
 from rest_framework.compat import unicode_to_repr
 from rest_framework.utils import model_meta
@@ -939,6 +939,9 @@ def get_fields(self):
             except FieldDoesNotExist:
                 continue
 
+            if not isinstance(model_field, DjangoField):
+                continue
+
             # Include each of the `unique_for_*` field names.
             unique_constraint_names |= set([
                 model_field.unique_for_date,