Properly handle custom Django managers (Closes #201).

The actual behavior of Django with custom managers and inherited
abstract models is rather complex, so this had to be adapted to the
actual Django source code.

4 files changed, 35 insertions, 2 deletions

diff --git a/docs/changelog.rst b/docs/changelog.rst
index 0cbd4af..c871ce8 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -15,6 +15,10 @@ ChangeLog
       thus allowing to pass in a lazy iterator such as a Django queryset
       (i.e ``factory.Iterator(models.MyThingy.objects.all())``).
 
+*Bugfix:*
+
+    - :issue:`201`: Properly handle custom Django managers when dealing with abstract Django models.
+
 .. _v2.5.2:
 
 2.5.2 (2015-04-21)
diff --git a/factory/django.py b/factory/django.py
index 74e4fdb..e4a3ea7 100644
--- a/factory/django.py
+++ b/factory/django.py
@@ -115,7 +115,14 @@ class DjangoModelFactory(base.Factory):
         if model_class is None:
             raise base.AssociatedClassError("No model set on %s.%s.Meta"
                     % (cls.__module__, cls.__name__))
-        manager = model_class.objects
+
+        try:
+            manager = model_class.objects
+        except AttributeError:
+            # When inheriting from an abstract model with a custom
+            # manager, the class has no 'objects' field.
+            manager = model_class._default_manager
+
         if cls._meta.database != DEFAULT_DB_ALIAS:
             manager = manager.using(cls._meta.database)
         return manager
diff --git a/tests/djapp/models.py b/tests/djapp/models.py
index 68b9709..cadefbc 100644
--- a/tests/djapp/models.py
+++ b/tests/djapp/models.py
@@ -110,3 +110,14 @@ class WithCustomManager(models.Model):
     foo = models.CharField(max_length=20)
 
     objects = CustomManager()
+
+
+class AbstractWithCustomManager(models.Model):
+    custom_objects = CustomManager()
+
+    class Meta:
+        abstract = True
+
+
+class FromAbstractWithCustomManager(AbstractWithCustomManager):
+    pass
diff --git a/tests/test_django.py b/tests/test_django.py
index bde8efe..b8e7ccb 100644
--- a/tests/test_django.py
+++ b/tests/test_django.py
@@ -755,10 +755,21 @@ class PreventSignalsTestCase(unittest.TestCase):
 
         self.assertSignalsReactivated()
 
-class DjangoCustomManagerTestCase(django_test.TestCase):
+@unittest.skipIf(django is None, "Django not installed.")
+class DjangoCustomManagerTestCase(unittest.TestCase):
 
     def test_extra_args(self):
+        # Our CustomManager will remove the 'arg=' argument.
         model = WithCustomManagerFactory(arg='foo')
 
+    def test_with_manager_on_abstract(self):
+        class ObjFactory(factory.django.DjangoModelFactory):
+            class Meta:
+                model = models.FromAbstractWithCustomManager
+
+        # Our CustomManager will remove the 'arg=' argument,
+        # invalid for the actual model.
+        ObjFactory.create(arg='invalid')
+
 if __name__ == '__main__':  # pragma: no cover
     unittest.main()