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Code Issues 32 Releases Wiki Activity

Fixed #28834 -- Followed ancestor links on field cache lookup failure.

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Thanks Tim for the review.
This commit is contained in:
Simon Charette
2017-11-23 02:14:32 -05:00
parent 746caf3ef8
commit 78c5e7b90e
4 changed files with 34 additions and 1 deletions
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16
tests/model_inheritance/tests.py
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@@ -368,6 +368,22 @@ class ModelInheritanceDataTests(TestCase):
self.assertEqual(qs[1].italianrestaurant.name, 'Ristorante Miron')
self.assertEqual(qs[1].italianrestaurant.rating, 4)
def test_parent_cache_reuse(self):
place = Place.objects.create()
GrandChild.objects.create(place=place)
grand_parent = GrandParent.objects.latest('pk')
with self.assertNumQueries(1):
self.assertEqual(grand_parent.place, place)
parent = grand_parent.parent
with self.assertNumQueries(0):
self.assertEqual(parent.place, place)
child = parent.child
with self.assertNumQueries(0):
self.assertEqual(child.place, place)
grandchild = child.grandchild
with self.assertNumQueries(0):
self.assertEqual(grandchild.place, place)
def test_update_query_counts(self):
"""
Update queries do not generate unnecessary queries (#18304).