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Fixed #27710 -- Made Model.save() invalidate cached, stale relations after a primary key assignment.
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@ -674,6 +674,10 @@ class Model(metaclass=ModelBase):
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"save() prohibited to prevent data loss due to "
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"unsaved related object '%s'." % field.name
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)
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# If the relationship's pk was changed, clear the cached
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# relationship.
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if obj and obj.pk != getattr(self, field.attname):
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field.delete_cached_value(self)
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using = using or router.db_for_write(self.__class__, instance=self)
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if force_insert and (force_update or update_fields):
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@ -656,3 +656,13 @@ class ManyToOneTests(TestCase):
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self.assertEqual(city.districts.count(), 2)
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city.districts.remove(d2)
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self.assertEqual(city.districts.count(), 1)
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def test_cached_relation_invalidated_on_save(self):
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"""
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Model.save() invalidates stale ForeignKey relations after a primary key
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assignment.
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"""
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self.assertEqual(self.a.reporter, self.r) # caches a.reporter
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self.a.reporter_id = self.r2.pk
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self.a.save()
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self.assertEqual(self.a.reporter, self.r2)
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@ -507,3 +507,13 @@ class OneToOneTests(TestCase):
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pointer = ToFieldPointer.objects.create(target=target)
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self.assertSequenceEqual(ToFieldPointer.objects.filter(target=target), [pointer])
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self.assertSequenceEqual(ToFieldPointer.objects.filter(pk__exact=pointer), [pointer])
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def test_cached_relation_invalidated_on_save(self):
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"""
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Model.save() invalidates stale OneToOneField relations after a primary
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key assignment.
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"""
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self.assertEqual(self.b1.place, self.p1) # caches b1.place
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self.b1.place_id = self.p2.pk
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self.b1.save()
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self.assertEqual(self.b1.place, self.p2)
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