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471 lines
19 KiB
Python
471 lines
19 KiB
Python
from __future__ import unicode_literals
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from django.db import IntegrityError, connection, models, transaction
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from django.test import TestCase
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from .models import (
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Bar, Director, Favorites, HiddenPointer, ManualPrimaryKey, MultiModel,
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Place, RelatedModel, Restaurant, School, Target, UndergroundBar, Waiter,
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)
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class OneToOneTests(TestCase):
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def setUp(self):
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self.p1 = Place.objects.create(name='Demon Dogs', address='944 W. Fullerton')
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self.p2 = Place.objects.create(name='Ace Hardware', address='1013 N. Ashland')
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self.r1 = Restaurant.objects.create(place=self.p1, serves_hot_dogs=True, serves_pizza=False)
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self.b1 = Bar.objects.create(place=self.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(repr(self.p1.restaurant), '<Restaurant: Demon Dogs the restaurant>')
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# p2 doesn't have an associated restaurant.
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with self.assertRaisesMessage(Restaurant.DoesNotExist, 'Place has no restaurant'):
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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(repr(self.p2.restaurant), '<Restaurant: Ace Hardware the restaurant>')
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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(repr(self.p1.restaurant), '<Restaurant: Demon Dogs the restaurant>')
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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.assertQuerysetEqual(Restaurant.objects.all(), [
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'<Restaurant: Demon Dogs the restaurant>',
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])
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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.assertQuerysetEqual(Place.objects.order_by('name'), [
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'<Place: Ace Hardware the place>',
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'<Place: Demon Dogs the place>',
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])
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def test_manager_get(self):
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def assert_get_restaurant(**params):
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self.assertEqual(repr(Restaurant.objects.get(**params)),
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'<Restaurant: Demon Dogs the restaurant>')
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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(repr(Place.objects.get(**params)),
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'<Place: Demon Dogs the place>')
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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(repr(w), '<Waiter: Joe the waiter at Demon Dogs the restaurant>')
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# Query the waiters
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def assert_filter_waiters(**params):
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self.assertQuerysetEqual(Waiter.objects.filter(**params), [
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'<Waiter: Joe the waiter at Demon Dogs the restaurant>'
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])
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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.assertRaisesMessage(ValueError,
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'Cannot assign "%r": "%s" instance isn\'t saved in the database.'
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% (place, Restaurant.place.field.rel.to._meta.object_name)):
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Restaurant.objects.create(place=place, serves_hot_dogs=True, serves_pizza=False)
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bar = UndergroundBar()
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p = Place(name='User', address='London')
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with self.assertRaisesMessage(ValueError,
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'Cannot assign "%r": "%s" instance isn\'t saved in the database.'
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% (bar, p._meta.object_name)):
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p.undergroundbar = bar
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def test_unsaved_object_check_override(self):
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"""
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#24495 - Assigning an unsaved object to a OneToOneField
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should be allowed when the allow_unsaved_instance_assignment
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attribute has been set to True.
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"""
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class UnsavedOneToOneField(models.OneToOneField):
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# A OneToOneField which can point to an unsaved object
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allow_unsaved_instance_assignment = True
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class Band(models.Model):
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name = models.CharField(max_length=50)
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class BandManager(models.Model):
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band = UnsavedOneToOneField(Band)
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first_name = models.CharField(max_length=50)
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last_name = models.CharField(max_length=50)
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band = Band(name='The Beatles')
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manager = BandManager(first_name='Brian', last_name='Epstein')
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# This should not raise an exception as the OneToOneField between
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# manager and band has allow_unsaved_instance_assignment=True.
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manager.band = band
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self.assertEqual(manager.band, band)
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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.all().count(), 1)
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self.assertEqual(UndergroundBar.objects.all().count(), 1)
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def test_create_models_m2m(self):
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"""
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Regression test for #1064 and #1506
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Check that we create models via the m2m relation if the remote model
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has a OneToOneField.
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"""
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f = Favorites(name='Fred')
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f.save()
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f.restaurants = [self.r1]
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self.assertQuerysetEqual(
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f.restaurants.all(),
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['<Restaurant: Demon Dogs the restaurant>']
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)
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def test_reverse_object_cache(self):
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"""
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Regression test for #7173
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Check that the name of the cache for the reverse object is correct.
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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_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._restaurant_cache
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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 fails: Place.restaurant is null=False
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self.assertRaises(ValueError, setattr, p, 'restaurant', None)
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# You also can't assign an object of the wrong type here
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self.assertRaises(ValueError, 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 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.objects.create()
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self.assertQuerysetEqual(
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Target.objects.filter(pointer=None),
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['<Target: Target object>']
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)
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self.assertQuerysetEqual(
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Target.objects.exclude(pointer=None),
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[]
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)
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self.assertQuerysetEqual(
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Target.objects.filter(second_pointer=None),
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['<Target: Target object>']
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)
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self.assertQuerysetEqual(
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Target.objects.exclude(second_pointer=None),
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[]
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)
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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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with self.assertNumQueries(0):
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with self.assertRaises(ValueError):
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p.undergroundbar = b
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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(Target, HiddenPointer._meta.get_field('target').rel.get_accessor_name())
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)
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def test_related_object(self):
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public_school = School.objects.create(is_public=True)
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public_director = Director.objects.create(school=public_school, is_temp=False)
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private_school = School.objects.create(is_public=False)
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private_director = Director.objects.create(school=private_school, is_temp=True)
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# Only one school is available via all() due to the custom default manager.
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self.assertQuerysetEqual(
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School.objects.all(),
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["<School: School object>"]
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)
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# Only one director is available via all() due to the custom default manager.
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self.assertQuerysetEqual(
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Director.objects.all(),
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["<Director: Director object>"]
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)
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self.assertEqual(public_director.school, public_school)
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self.assertEqual(public_school.director, public_director)
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# Make sure the base manager is used so that the related objects
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# is still accessible even if the default manager doesn't normally
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# allow it.
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self.assertEqual(private_director.school, private_school)
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# Make sure the base manager is used so that an student can still access
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# its related school even if the default manager doesn't normally
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# allow it.
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self.assertEqual(private_school.director, private_director)
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# If the manager is marked "use_for_related_fields", it'll get used instead
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# of the "bare" queryset. Usually you'd define this as a property on the class,
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# but this approximates that in a way that's easier in tests.
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School.objects.use_for_related_fields = True
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try:
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private_director = Director._base_manager.get(pk=private_director.pk)
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self.assertRaises(School.DoesNotExist, lambda: private_director.school)
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finally:
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School.objects.use_for_related_fields = False
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Director.objects.use_for_related_fields = True
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try:
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private_school = School._base_manager.get(pk=private_school.pk)
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self.assertRaises(Director.DoesNotExist, lambda: private_school.director)
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finally:
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Director.objects.use_for_related_fields = False
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def test_hasattr_related_object(self):
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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(Director(), 'director'))
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self.assertFalse(hasattr(School(), 'school'))
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