from django.test import TestCase from regressiontests.one_to_one_regress.models import * class OneToOneRegressionTests(TestCase): def setUp(self): self.p1 = Place(name='Demon Dogs', address='944 W. Fullerton') self.p1.save() self.r1 = Restaurant(place=self.p1, serves_hot_dogs=True, serves_pizza=False) self.r1.save() self.b1 = Bar(place=self.p1, serves_cocktails=False) self.b1.save() def test_reverse_relationship_cache_cascade(self): """ Regression test for #9023: accessing the reverse relationship shouldn't result in a cascading delete(). """ bar = UndergroundBar.objects.create(place=self.p1, serves_cocktails=False) # The bug in #9023: if you access the one-to-one relation *before* # setting to None and deleting, the cascade happens anyway. self.p1.undergroundbar bar.place.name='foo' bar.place = None bar.save() self.p1.delete() self.assertEqual(Place.objects.all().count(), 0) self.assertEqual(UndergroundBar.objects.all().count(), 1) def test_create_models_m2m(self): """ Regression test for #1064 and #1506 Check that we create models via the m2m relation if the remote model has a OneToOneField. """ f = Favorites(name = 'Fred') f.save() f.restaurants = [self.r1] self.assertQuerysetEqual( f.restaurants.all(), [''] ) def test_reverse_object_cache(self): """ Regression test for #7173 Check that the name of the cache for the reverse object is correct. """ self.assertEqual(self.p1.restaurant, self.r1) self.assertEqual(self.p1.bar, self.b1) def test_related_object_cache(self): """ Regression test for #6886 (the related-object cache) """ # Look up the objects again so that we get "fresh" objects p = Place.objects.get(name="Demon Dogs") r = p.restaurant # Accessing the related object again returns the exactly same object self.assertTrue(p.restaurant is r) # But if we kill the cache, we get a new object del p._restaurant_cache self.assertFalse(p.restaurant is r) # Reassigning the Restaurant object results in an immediate cache update # We can't use a new Restaurant because that'll violate one-to-one, but # with a new *instance* the is test below will fail if #6886 regresses. r2 = Restaurant.objects.get(pk=r.pk) p.restaurant = r2 self.assertTrue(p.restaurant is r2) # Assigning None succeeds if field is null=True. ug_bar = UndergroundBar.objects.create(place=p, serves_cocktails=False) ug_bar.place = None self.assertTrue(ug_bar.place is None) # Assigning None fails: Place.restaurant is null=False self.assertRaises(ValueError, setattr, p, 'restaurant', None) # You also can't assign an object of the wrong type here self.assertRaises(ValueError, setattr, p, 'restaurant', p) # Creation using keyword argument should cache the related object. p = Place.objects.get(name="Demon Dogs") r = Restaurant(place=p) self.assertTrue(r.place is p) # Creation using keyword argument and unsaved related instance (#8070). p = Place() r = Restaurant(place=p) self.assertTrue(r.place is p) # Creation using attname keyword argument and an id will cause the related # object to be fetched. p = Place.objects.get(name="Demon Dogs") r = Restaurant(place_id=p.id) self.assertFalse(r.place is p) self.assertEqual(r.place, p) def test_filter_one_to_one_relations(self): """ Regression test for #9968 filtering reverse one-to-one relations with primary_key=True was misbehaving. We test both (primary_key=True & False) cases here to prevent any reappearance of the problem. """ t = Target.objects.create() self.assertQuerysetEqual( Target.objects.filter(pointer=None), [''] ) self.assertQuerysetEqual( Target.objects.exclude(pointer=None), [] ) self.assertQuerysetEqual( Target.objects.filter(pointer2=None), [''] ) self.assertQuerysetEqual( Target.objects.exclude(pointer2=None), [] )