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Fixed #23370 -- defer() + select_related() crashed with inherited models.

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Akis Kesoglou 2014-08-29 17:01:21 +03:00 • committed by Tim Graham
parent 66757fee7e
commit 6613ea6e3f
4 changed files with 46 additions and 5 deletions
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37
tests/model_inheritance/tests.py
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@ -255,6 +255,43 @@ class ModelInheritanceTests(TestCase):
1, lambda: ItalianRestaurant.objects.select_related("chef")[0].chef
)
def test_select_related_defer(self):
"""
#23370 - Should be able to defer child fields when using
select_related() from parent to child.
"""
Restaurant.objects.create(
name="Demon Dogs",
address="944 W. Fullerton",
serves_hot_dogs=True,
serves_pizza=False,
rating=2,
)
ItalianRestaurant.objects.create(
name="Ristorante Miron",
address="1234 W. Ash",
serves_hot_dogs=False,
serves_pizza=False,
serves_gnocchi=True,
rating=4,
)
qs = (Restaurant.objects
.select_related("italianrestaurant")
.defer("italianrestaurant__serves_gnocchi")
.order_by("rating"))
# Test that the field was actually defered
with self.assertNumQueries(2):
objs = list(qs.all())
self.assertTrue(objs[1].italianrestaurant.serves_gnocchi)
# Test that model fields where assigned correct values
self.assertEqual(qs[0].name, 'Demon Dogs')
self.assertEqual(qs[0].rating, 2)
self.assertEqual(qs[1].italianrestaurant.name, 'Ristorante Miron')
self.assertEqual(qs[1].italianrestaurant.rating, 4)
def test_mixin_init(self):
m = MixinModel()
self.assertEqual(m.other_attr, 1)