How to mock django's Q object

test_django_q.py

    @patch('quote_options.models.LiabilityLimit.objects.filter')
    @patch('quote.models.Q')
    def should_filter_with_q_object_in_get_liability_limits(self, q_object, limit_filter):
        manager_instance = Mock(spec=quote_models.LiabilityManager())
        policy = mock.Mock()

        q_instance = mock.Mock()
        q_or_method = mock.Mock()
        q_or_method.return_value = q_instance
        q_instance.__or__ = q_or_method
        q_object.return_value = q_instance

        results = quote_models.LiabilityManager.get_liability_limits(manager_instance, policy)

        limit_filter.assert_called_once_with(q_instance)
        self.assertEqual(2, q_or_method.call_count)
        self.assertEqual(limit_filter.return_value, results)

Ok, so in the end I figured out I was patching the object using a wrong namespace. Essentially, I failed to read:

http://www.voidspace.org.uk/python/mock/patch.html#where-to-patch

Thanks for the gist once again :)