diff options
Diffstat (limited to 'tests/modeltests/defer')
| -rw-r--r-- | tests/modeltests/defer/tests.py | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/tests/modeltests/defer/tests.py b/tests/modeltests/defer/tests.py index 09138293af..eb09162b01 100644 --- a/tests/modeltests/defer/tests.py +++ b/tests/modeltests/defer/tests.py @@ -158,3 +158,18 @@ class DeferTests(TestCase): self.assert_delayed(child, 1) self.assertEqual(child.name, 'p1') self.assertEqual(child.value, 'xx') + + def test_defer_inheritance_pk_chaining(self): + """ + When an inherited model is fetched from the DB, its PK is also fetched. + When getting the PK of the parent model it is useful to use the already + fetched parent model PK if it happens to be available. Tests that this + is done. + """ + s1 = Secondary.objects.create(first="x1", second="y1") + bc = BigChild.objects.create(name="b1", value="foo", related=s1, + other="bar") + bc_deferred = BigChild.objects.only('name').get(pk=bc.pk) + with self.assertNumQueries(0): + bc_deferred.id + self.assertEqual(bc_deferred.pk, bc_deferred.id) |