Respect default manager in DjangoModelFactory (Closes #192).

The previous version tries to use ``cls._default_manager`` all the time,
which breaks with ``manager.using(db_name)``.

4 files changed, 38 insertions, 7 deletions

diff --git a/docs/changelog.rst b/docs/changelog.rst
index a7ff050..cc4a1dc 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -7,6 +7,9 @@ ChangeLog
 2.5.1 (master)
 --------------
 
+*Bugfix:*
+
+    - Respect custom managers in :class:`~factory.django.DjangoModelFactory` (see :issue:`192`)
 
 .. _v2.5.0:
 
diff --git a/factory/django.py b/factory/django.py
index eb07bfb..ba81f13 100644
--- a/factory/django.py
+++ b/factory/django.py
@@ -45,6 +45,8 @@ from .compat import BytesIO, is_string
 logger = logging.getLogger('factory.generate')
 
 
+DEFAULT_DB_ALIAS = 'default'  # Same as django.db.DEFAULT_DB_ALIAS
+
 
 def require_django():
     """Simple helper to ensure Django is available."""
@@ -56,7 +58,7 @@ class DjangoOptions(base.FactoryOptions):
     def _build_default_options(self):
         return super(DjangoOptions, self)._build_default_options() + [
             base.OptionDefault('django_get_or_create', (), inherit=True),
-            base.OptionDefault('database', 'default', inherit=True),
+            base.OptionDefault('database', DEFAULT_DB_ALIAS, inherit=True),
         ]
 
     def _get_counter_reference(self):
@@ -100,12 +102,9 @@ class DjangoModelFactory(base.Factory):
         if model_class is None:
             raise base.AssociatedClassError("No model set on %s.%s.Meta"
                     % (cls.__module__, cls.__name__))
-        try:
-            manager = model_class._default_manager   # pylint: disable=W0212
-        except AttributeError:
-            manager = model_class.objects
-
-        manager = manager.using(cls._meta.database)
+        manager = model_class.objects
+        if cls._meta.database != DEFAULT_DB_ALIAS:
+            manager = manager.using(cls._meta.database)
         return manager
 
     @classmethod
diff --git a/tests/djapp/models.py b/tests/djapp/models.py
index 35c765f..96ee5cf 100644
--- a/tests/djapp/models.py
+++ b/tests/djapp/models.py
@@ -87,3 +87,20 @@ else:
 
 class WithSignals(models.Model):
     foo = models.CharField(max_length=20)
+
+
+class CustomQuerySet(models.QuerySet):
+    pass
+
+
+class CustomManager(models.Manager):
+
+    def create(self, arg=None, **kwargs):
+        return super(CustomManager, self).create(**kwargs)
+
+
+class WithCustomManager(models.Model):
+
+    foo = models.CharField(max_length=20)
+
+    objects = CustomManager.from_queryset(CustomQuerySet)()
diff --git a/tests/test_django.py b/tests/test_django.py
index 2744032..9ac8f5c 100644
--- a/tests/test_django.py
+++ b/tests/test_django.py
@@ -157,6 +157,13 @@ if django is not None:
             model = models.WithSignals
 
 
+    class WithCustomManagerFactory(factory.django.DjangoModelFactory):
+        class Meta:
+            model = models.WithCustomManager
+
+        foo = factory.Sequence(lambda n: "foo%d" % n)
+
+
 @unittest.skipIf(django is None, "Django not installed.")
 class ModelTests(django_test.TestCase):
     def test_unset_model(self):
@@ -706,5 +713,10 @@ class PreventSignalsTestCase(unittest.TestCase):
 
         self.assertSignalsReactivated()
 
+class DjangoCustomManagerTestCase(django_test.TestCase):
+
+    def test_extra_args(self):
+        model = WithCustomManagerFactory(arg='foo')
+
 if __name__ == '__main__':  # pragma: no cover
     unittest.main()