fixed 'source_expressions'

(cherry picked from commit 9a34a2a5017499bb12512b2387de49aa2c40fc88)
2015-04-08 09:35:38 +07:00
parent 640461216b
commit 135feaf905
1 changed files with 3 additions and 2 deletions
@@ -103,8 +103,9 @@ class PolymorphicQuerySet(QuerySet):
            else:
                # With Django > 1.8, the field on which the aggregate operates is
                # stored inside a query expression.
-                a.source_expressions[0].name = translate_polymorphic_field_path(
-                    self.model, a.source_expressions[0].name)
+                if hasattr(a, 'source_expressions'):
+                    a.source_expressions[0].name = translate_polymorphic_field_path(
+                        self.model, a.source_expressions[0].name)

        get_lookup = lambda a: a.lookup if django.VERSION < (1, 8) else a.source_expressions[0].name