Test for #637.

rest_framework/tests/serializer.py

@@ -785,6 +785,23 @@ class RelatedTraversalTest(TestCase):
 
         self.assertEqual(serializer.data, expected)
 
+    def test_queryset_nested_traversal(self):
+        """
+        Relational fields should be able to use methods as their source.
+        """
+        BlogPost.objects.create(title='blah')
+
+        class QuerysetMethodSerializer(serializers.Serializer):
+            blogposts = serializers.RelatedField(many=True, source='get_all_blogposts')
+
+        class ClassWithQuerysetMethod(object):
+            def get_all_blogposts(self):
+                return BlogPost.objects
+
+        obj = ClassWithQuerysetMethod()
+        serializer = QuerysetMethodSerializer(obj)
+        self.assertEquals(serializer.data, {'blogposts': [u'BlogPost object']})
+
 
 class SerializerMethodFieldTests(TestCase):
     def setUp(self):