586 lines
22 KiB
Python
586 lines
22 KiB
Python
from django.db import IntegrityError, connection, transaction
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from django.test import TestCase
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from .models import (
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Bar,
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Director,
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Favorites,
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HiddenPointer,
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ManualPrimaryKey,
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MultiModel,
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Place,
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Pointer,
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RelatedModel,
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Restaurant,
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School,
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Target,
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ToFieldPointer,
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UndergroundBar,
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Waiter,
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)
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class OneToOneTests(TestCase):
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@classmethod
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def setUpTestData(cls):
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cls.p1 = Place.objects.create(name="Demon Dogs", address="944 W. Fullerton")
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cls.p2 = Place.objects.create(name="Ace Hardware", address="1013 N. Ashland")
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cls.r1 = Restaurant.objects.create(
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place=cls.p1, serves_hot_dogs=True, serves_pizza=False
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)
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cls.b1 = Bar.objects.create(place=cls.p1, serves_cocktails=False)
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def test_getter(self):
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# A Restaurant can access its place.
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self.assertEqual(repr(self.r1.place), "<Place: Demon Dogs the place>")
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# A Place can access its restaurant, if available.
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self.assertEqual(
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repr(self.p1.restaurant), "<Restaurant: Demon Dogs the restaurant>"
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)
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# p2 doesn't have an associated restaurant.
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with self.assertRaisesMessage(
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Restaurant.DoesNotExist, "Place has no restaurant"
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):
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self.p2.restaurant
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# The exception raised on attribute access when a related object
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# doesn't exist should be an instance of a subclass of `AttributeError`
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# refs #21563
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self.assertFalse(hasattr(self.p2, "restaurant"))
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def test_setter(self):
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# Set the place using assignment notation. Because place is the primary
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# key on Restaurant, the save will create a new restaurant
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self.r1.place = self.p2
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self.r1.save()
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self.assertEqual(
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repr(self.p2.restaurant), "<Restaurant: Ace Hardware the restaurant>"
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)
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self.assertEqual(repr(self.r1.place), "<Place: Ace Hardware the place>")
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self.assertEqual(self.p2.pk, self.r1.pk)
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# Set the place back again, using assignment in the reverse direction.
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self.p1.restaurant = self.r1
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self.assertEqual(
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repr(self.p1.restaurant), "<Restaurant: Demon Dogs the restaurant>"
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)
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r = Restaurant.objects.get(pk=self.p1.id)
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self.assertEqual(repr(r.place), "<Place: Demon Dogs the place>")
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def test_manager_all(self):
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# Restaurant.objects.all() just returns the Restaurants, not the Places.
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self.assertSequenceEqual(Restaurant.objects.all(), [self.r1])
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# Place.objects.all() returns all Places, regardless of whether they
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# have Restaurants.
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self.assertSequenceEqual(Place.objects.order_by("name"), [self.p2, self.p1])
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def test_manager_get(self):
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def assert_get_restaurant(**params):
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self.assertEqual(
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repr(Restaurant.objects.get(**params)),
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"<Restaurant: Demon Dogs the restaurant>",
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)
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assert_get_restaurant(place__id__exact=self.p1.pk)
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assert_get_restaurant(place__id=self.p1.pk)
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assert_get_restaurant(place__exact=self.p1.pk)
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assert_get_restaurant(place__exact=self.p1)
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assert_get_restaurant(place=self.p1.pk)
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assert_get_restaurant(place=self.p1)
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assert_get_restaurant(pk=self.p1.pk)
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assert_get_restaurant(place__pk__exact=self.p1.pk)
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assert_get_restaurant(place__pk=self.p1.pk)
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assert_get_restaurant(place__name__startswith="Demon")
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def assert_get_place(**params):
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self.assertEqual(
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repr(Place.objects.get(**params)), "<Place: Demon Dogs the place>"
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)
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assert_get_place(restaurant__place__exact=self.p1.pk)
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assert_get_place(restaurant__place__exact=self.p1)
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assert_get_place(restaurant__place__pk=self.p1.pk)
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assert_get_place(restaurant__exact=self.p1.pk)
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assert_get_place(restaurant__exact=self.r1)
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assert_get_place(restaurant__pk=self.p1.pk)
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assert_get_place(restaurant=self.p1.pk)
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assert_get_place(restaurant=self.r1)
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assert_get_place(id__exact=self.p1.pk)
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assert_get_place(pk=self.p1.pk)
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def test_foreign_key(self):
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# Add a Waiter to the Restaurant.
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w = self.r1.waiter_set.create(name="Joe")
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self.assertEqual(
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repr(w), "<Waiter: Joe the waiter at Demon Dogs the restaurant>"
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)
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# Query the waiters
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def assert_filter_waiters(**params):
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self.assertSequenceEqual(Waiter.objects.filter(**params), [w])
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assert_filter_waiters(restaurant__place__exact=self.p1.pk)
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assert_filter_waiters(restaurant__place__exact=self.p1)
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assert_filter_waiters(restaurant__place__pk=self.p1.pk)
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assert_filter_waiters(restaurant__exact=self.r1.pk)
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assert_filter_waiters(restaurant__exact=self.r1)
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assert_filter_waiters(restaurant__pk=self.r1.pk)
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assert_filter_waiters(restaurant=self.r1.pk)
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assert_filter_waiters(restaurant=self.r1)
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assert_filter_waiters(id__exact=w.pk)
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assert_filter_waiters(pk=w.pk)
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# Delete the restaurant; the waiter should also be removed
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r = Restaurant.objects.get(pk=self.r1.pk)
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r.delete()
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self.assertEqual(Waiter.objects.count(), 0)
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def test_multiple_o2o(self):
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# One-to-one fields still work if you create your own primary key
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o1 = ManualPrimaryKey(primary_key="abc123", name="primary")
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o1.save()
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o2 = RelatedModel(link=o1, name="secondary")
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o2.save()
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# You can have multiple one-to-one fields on a model, too.
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x1 = MultiModel(link1=self.p1, link2=o1, name="x1")
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x1.save()
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self.assertEqual(repr(o1.multimodel), "<MultiModel: Multimodel x1>")
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# This will fail because each one-to-one field must be unique (and
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# link2=o1 was used for x1, above).
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mm = MultiModel(link1=self.p2, link2=o1, name="x1")
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with self.assertRaises(IntegrityError):
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with transaction.atomic():
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mm.save()
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def test_unsaved_object(self):
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"""
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#10811 -- Assigning an unsaved object to a OneToOneField
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should raise an exception.
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"""
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place = Place(name="User", address="London")
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with self.assertRaises(Restaurant.DoesNotExist):
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place.restaurant
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msg = (
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"save() prohibited to prevent data loss due to unsaved related object "
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"'place'."
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)
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with self.assertRaisesMessage(ValueError, msg):
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Restaurant.objects.create(
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place=place, serves_hot_dogs=True, serves_pizza=False
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)
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# place should not cache restaurant
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with self.assertRaises(Restaurant.DoesNotExist):
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place.restaurant
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def test_reverse_relationship_cache_cascade(self):
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"""
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Regression test for #9023: accessing the reverse relationship shouldn't
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result in a cascading delete().
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"""
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bar = UndergroundBar.objects.create(place=self.p1, serves_cocktails=False)
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# The bug in #9023: if you access the one-to-one relation *before*
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# setting to None and deleting, the cascade happens anyway.
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self.p1.undergroundbar
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bar.place.name = "foo"
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bar.place = None
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bar.save()
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self.p1.delete()
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self.assertEqual(Place.objects.count(), 1)
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self.assertEqual(UndergroundBar.objects.count(), 1)
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def test_create_models_m2m(self):
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"""
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Models are created via the m2m relation if the remote model has a
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OneToOneField (#1064, #1506).
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"""
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f = Favorites(name="Fred")
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f.save()
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f.restaurants.set([self.r1])
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self.assertSequenceEqual(f.restaurants.all(), [self.r1])
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def test_reverse_object_cache(self):
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"""
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The name of the cache for the reverse object is correct (#7173).
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"""
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self.assertEqual(self.p1.restaurant, self.r1)
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self.assertEqual(self.p1.bar, self.b1)
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def test_assign_none_reverse_relation(self):
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p = Place.objects.get(name="Demon Dogs")
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# Assigning None succeeds if field is null=True.
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ug_bar = UndergroundBar.objects.create(place=p, serves_cocktails=False)
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p.undergroundbar = None
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self.assertIsNone(ug_bar.place)
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ug_bar.save()
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ug_bar.refresh_from_db()
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self.assertIsNone(ug_bar.place)
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def test_assign_none_null_reverse_relation(self):
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p = Place.objects.get(name="Demon Dogs")
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# Assigning None doesn't throw AttributeError if there isn't a related
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# UndergroundBar.
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p.undergroundbar = None
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def test_assign_none_to_null_cached_reverse_relation(self):
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p = Place.objects.get(name="Demon Dogs")
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# Prime the relation's cache with a value of None.
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with self.assertRaises(Place.undergroundbar.RelatedObjectDoesNotExist):
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getattr(p, "undergroundbar")
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# Assigning None works if there isn't a related UndergroundBar and the
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# reverse cache has a value of None.
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p.undergroundbar = None
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def test_assign_o2o_id_value(self):
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b = UndergroundBar.objects.create(place=self.p1)
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b.place_id = self.p2.pk
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b.save()
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self.assertEqual(b.place_id, self.p2.pk)
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self.assertFalse(UndergroundBar.place.is_cached(b))
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self.assertEqual(b.place, self.p2)
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self.assertTrue(UndergroundBar.place.is_cached(b))
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# Reassigning the same value doesn't clear a cached instance.
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b.place_id = self.p2.pk
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self.assertTrue(UndergroundBar.place.is_cached(b))
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def test_assign_o2o_id_none(self):
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b = UndergroundBar.objects.create(place=self.p1)
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b.place_id = None
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b.save()
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self.assertIsNone(b.place_id)
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self.assertFalse(UndergroundBar.place.is_cached(b))
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self.assertIsNone(b.place)
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self.assertTrue(UndergroundBar.place.is_cached(b))
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def test_related_object_cache(self):
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"""Regression test for #6886 (the related-object cache)"""
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# Look up the objects again so that we get "fresh" objects
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p = Place.objects.get(name="Demon Dogs")
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r = p.restaurant
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# Accessing the related object again returns the exactly same object
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self.assertIs(p.restaurant, r)
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# But if we kill the cache, we get a new object
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del p._state.fields_cache["restaurant"]
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self.assertIsNot(p.restaurant, r)
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# Reassigning the Restaurant object results in an immediate cache update
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# We can't use a new Restaurant because that'll violate one-to-one, but
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# with a new *instance* the is test below will fail if #6886 regresses.
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r2 = Restaurant.objects.get(pk=r.pk)
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p.restaurant = r2
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self.assertIs(p.restaurant, r2)
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# Assigning None succeeds if field is null=True.
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ug_bar = UndergroundBar.objects.create(place=p, serves_cocktails=False)
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ug_bar.place = None
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self.assertIsNone(ug_bar.place)
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# Assigning None will not fail: Place.restaurant is null=False
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setattr(p, "restaurant", None)
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# You also can't assign an object of the wrong type here
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msg = (
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'Cannot assign "<Place: Demon Dogs the place>": '
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'"Place.restaurant" must be a "Restaurant" instance.'
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)
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with self.assertRaisesMessage(ValueError, msg):
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setattr(p, "restaurant", p)
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# Creation using keyword argument should cache the related object.
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p = Place.objects.get(name="Demon Dogs")
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r = Restaurant(place=p)
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self.assertIs(r.place, p)
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# Creation using keyword argument and unsaved related instance (#8070).
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p = Place()
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r = Restaurant(place=p)
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self.assertIs(r.place, p)
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# Creation using attname keyword argument and an id will cause the related
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# object to be fetched.
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p = Place.objects.get(name="Demon Dogs")
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r = Restaurant(place_id=p.id)
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self.assertIsNot(r.place, p)
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self.assertEqual(r.place, p)
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def test_filter_one_to_one_relations(self):
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"""
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Regression test for #9968
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filtering reverse one-to-one relations with primary_key=True was
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misbehaving. We test both (primary_key=True & False) cases here to
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prevent any reappearance of the problem.
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"""
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target = Target.objects.create()
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self.assertSequenceEqual(Target.objects.filter(pointer=None), [target])
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self.assertSequenceEqual(Target.objects.exclude(pointer=None), [])
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self.assertSequenceEqual(Target.objects.filter(second_pointer=None), [target])
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self.assertSequenceEqual(Target.objects.exclude(second_pointer=None), [])
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def test_o2o_primary_key_delete(self):
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t = Target.objects.create(name="name")
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Pointer.objects.create(other=t)
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num_deleted, objs = Pointer.objects.filter(other__name="name").delete()
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self.assertEqual(num_deleted, 1)
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self.assertEqual(objs, {"one_to_one.Pointer": 1})
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def test_save_nullable_o2o_after_parent(self):
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place = Place(name="Rose tattoo")
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bar = UndergroundBar(place=place)
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place.save()
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bar.save()
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bar.refresh_from_db()
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self.assertEqual(bar.place, place)
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def test_reverse_object_does_not_exist_cache(self):
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"""
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Regression for #13839 and #17439.
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DoesNotExist on a reverse one-to-one relation is cached.
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"""
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p = Place(name="Zombie Cats", address="Not sure")
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p.save()
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with self.assertNumQueries(1):
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with self.assertRaises(Restaurant.DoesNotExist):
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p.restaurant
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with self.assertNumQueries(0):
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with self.assertRaises(Restaurant.DoesNotExist):
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p.restaurant
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def test_reverse_object_cached_when_related_is_accessed(self):
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"""
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Regression for #13839 and #17439.
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The target of a one-to-one relation is cached
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when the origin is accessed through the reverse relation.
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"""
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# Use a fresh object without caches
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r = Restaurant.objects.get(pk=self.r1.pk)
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p = r.place
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with self.assertNumQueries(0):
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self.assertEqual(p.restaurant, r)
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def test_related_object_cached_when_reverse_is_accessed(self):
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"""
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Regression for #13839 and #17439.
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The origin of a one-to-one relation is cached
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when the target is accessed through the reverse relation.
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"""
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# Use a fresh object without caches
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p = Place.objects.get(pk=self.p1.pk)
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r = p.restaurant
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with self.assertNumQueries(0):
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self.assertEqual(r.place, p)
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def test_reverse_object_cached_when_related_is_set(self):
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"""
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Regression for #13839 and #17439.
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The target of a one-to-one relation is always cached.
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"""
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p = Place(name="Zombie Cats", address="Not sure")
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p.save()
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self.r1.place = p
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self.r1.save()
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with self.assertNumQueries(0):
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self.assertEqual(p.restaurant, self.r1)
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def test_reverse_object_cached_when_related_is_unset(self):
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"""
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Regression for #13839 and #17439.
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The target of a one-to-one relation is always cached.
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"""
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b = UndergroundBar(place=self.p1, serves_cocktails=True)
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b.save()
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with self.assertNumQueries(0):
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self.assertEqual(self.p1.undergroundbar, b)
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b.place = None
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b.save()
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with self.assertNumQueries(0):
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with self.assertRaises(UndergroundBar.DoesNotExist):
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self.p1.undergroundbar
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def test_get_reverse_on_unsaved_object(self):
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"""
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Regression for #18153 and #19089.
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Accessing the reverse relation on an unsaved object
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always raises an exception.
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"""
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p = Place()
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# When there's no instance of the origin of the one-to-one
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with self.assertNumQueries(0):
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with self.assertRaises(UndergroundBar.DoesNotExist):
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p.undergroundbar
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UndergroundBar.objects.create()
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# When there's one instance of the origin
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# (p.undergroundbar used to return that instance)
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with self.assertNumQueries(0):
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with self.assertRaises(UndergroundBar.DoesNotExist):
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p.undergroundbar
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# Several instances of the origin are only possible if database allows
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# inserting multiple NULL rows for a unique constraint
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if connection.features.supports_nullable_unique_constraints:
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UndergroundBar.objects.create()
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# When there are several instances of the origin
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with self.assertNumQueries(0):
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with self.assertRaises(UndergroundBar.DoesNotExist):
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p.undergroundbar
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def test_set_reverse_on_unsaved_object(self):
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"""
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Writing to the reverse relation on an unsaved object
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is impossible too.
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"""
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p = Place()
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b = UndergroundBar.objects.create()
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# Assigning a reverse relation on an unsaved object is allowed.
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p.undergroundbar = b
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# However saving the object is not allowed.
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msg = (
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"save() prohibited to prevent data loss due to unsaved related object "
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"'place'."
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)
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with self.assertNumQueries(0):
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with self.assertRaisesMessage(ValueError, msg):
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b.save()
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def test_nullable_o2o_delete(self):
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u = UndergroundBar.objects.create(place=self.p1)
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u.place_id = None
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u.save()
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self.p1.delete()
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self.assertTrue(UndergroundBar.objects.filter(pk=u.pk).exists())
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self.assertIsNone(UndergroundBar.objects.get(pk=u.pk).place)
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def test_hidden_accessor(self):
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"""
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When a '+' ending related name is specified no reverse accessor should
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be added to the related model.
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"""
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self.assertFalse(
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hasattr(
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Target,
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|
HiddenPointer._meta.get_field(
|
|
"target"
|
|
).remote_field.get_accessor_name(),
|
|
)
|
|
)
|
|
|
|
def test_related_object(self):
|
|
public_school = School.objects.create(is_public=True)
|
|
public_director = Director.objects.create(school=public_school, is_temp=False)
|
|
|
|
private_school = School.objects.create(is_public=False)
|
|
private_director = Director.objects.create(school=private_school, is_temp=True)
|
|
|
|
# Only one school is available via all() due to the custom default manager.
|
|
self.assertSequenceEqual(School.objects.all(), [public_school])
|
|
|
|
# Only one director is available via all() due to the custom default manager.
|
|
self.assertSequenceEqual(Director.objects.all(), [public_director])
|
|
|
|
self.assertEqual(public_director.school, public_school)
|
|
self.assertEqual(public_school.director, public_director)
|
|
|
|
# Make sure the base manager is used so that the related objects
|
|
# is still accessible even if the default manager doesn't normally
|
|
# allow it.
|
|
self.assertEqual(private_director.school, private_school)
|
|
|
|
# Make sure the base manager is used so that an student can still access
|
|
# its related school even if the default manager doesn't normally
|
|
# allow it.
|
|
self.assertEqual(private_school.director, private_director)
|
|
|
|
School._meta.base_manager_name = "objects"
|
|
School._meta._expire_cache()
|
|
try:
|
|
private_director = Director._base_manager.get(pk=private_director.pk)
|
|
with self.assertRaises(School.DoesNotExist):
|
|
private_director.school
|
|
finally:
|
|
School._meta.base_manager_name = None
|
|
School._meta._expire_cache()
|
|
|
|
Director._meta.base_manager_name = "objects"
|
|
Director._meta._expire_cache()
|
|
try:
|
|
private_school = School._base_manager.get(pk=private_school.pk)
|
|
with self.assertRaises(Director.DoesNotExist):
|
|
private_school.director
|
|
finally:
|
|
Director._meta.base_manager_name = None
|
|
Director._meta._expire_cache()
|
|
|
|
def test_hasattr_related_object(self):
|
|
# The exception raised on attribute access when a related object
|
|
# doesn't exist should be an instance of a subclass of `AttributeError`
|
|
# refs #21563
|
|
self.assertFalse(hasattr(Director(), "director"))
|
|
self.assertFalse(hasattr(School(), "school"))
|
|
|
|
def test_update_one_to_one_pk(self):
|
|
p1 = Place.objects.create()
|
|
p2 = Place.objects.create()
|
|
r1 = Restaurant.objects.create(place=p1)
|
|
r2 = Restaurant.objects.create(place=p2)
|
|
w = Waiter.objects.create(restaurant=r1)
|
|
|
|
Waiter.objects.update(restaurant=r2)
|
|
w.refresh_from_db()
|
|
self.assertEqual(w.restaurant, r2)
|
|
|
|
def test_rel_pk_subquery(self):
|
|
r = Restaurant.objects.first()
|
|
q1 = Restaurant.objects.filter(place_id=r.pk)
|
|
# Subquery using primary key and a query against the
|
|
# same model works correctly.
|
|
q2 = Restaurant.objects.filter(place_id__in=q1)
|
|
self.assertSequenceEqual(q2, [r])
|
|
# Subquery using 'pk__in' instead of 'place_id__in' work, too.
|
|
q2 = Restaurant.objects.filter(
|
|
pk__in=Restaurant.objects.filter(place__id=r.place.pk)
|
|
)
|
|
self.assertSequenceEqual(q2, [r])
|
|
q3 = Restaurant.objects.filter(place__in=Place.objects.all())
|
|
self.assertSequenceEqual(q3, [r])
|
|
q4 = Restaurant.objects.filter(place__in=Place.objects.filter(id=r.pk))
|
|
self.assertSequenceEqual(q4, [r])
|
|
|
|
def test_rel_pk_exact(self):
|
|
r = Restaurant.objects.first()
|
|
r2 = Restaurant.objects.filter(pk__exact=r).first()
|
|
self.assertEqual(r, r2)
|
|
|
|
def test_primary_key_to_field_filter(self):
|
|
target = Target.objects.create(name="foo")
|
|
pointer = ToFieldPointer.objects.create(target=target)
|
|
self.assertSequenceEqual(
|
|
ToFieldPointer.objects.filter(target=target), [pointer]
|
|
)
|
|
self.assertSequenceEqual(
|
|
ToFieldPointer.objects.filter(pk__exact=pointer), [pointer]
|
|
)
|
|
|
|
def test_cached_relation_invalidated_on_save(self):
|
|
"""
|
|
Model.save() invalidates stale OneToOneField relations after a primary
|
|
key assignment.
|
|
"""
|
|
self.assertEqual(self.b1.place, self.p1) # caches b1.place
|
|
self.b1.place_id = self.p2.pk
|
|
self.b1.save()
|
|
self.assertEqual(self.b1.place, self.p2)
|