262 lines
8.9 KiB
Python
262 lines
8.9 KiB
Python
from __future__ import unicode_literals
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from django.db import connection
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from django.test import TestCase
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from .models import (Bar, Favorites, HiddenPointer, Place, Restaurant, Target,
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UndergroundBar)
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class OneToOneRegressionTests(TestCase):
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def setUp(self):
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self.p1 = Place(name='Demon Dogs', address='944 W. Fullerton')
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self.p1.save()
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self.r1 = Restaurant(place=self.p1, serves_hot_dogs=True, serves_pizza=False)
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self.r1.save()
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self.b1 = Bar(place=self.p1, serves_cocktails=False)
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self.b1.save()
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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(), 0)
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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.assertTrue(p.restaurant is 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.assertFalse(p.restaurant is 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.assertTrue(p.restaurant is 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.assertTrue(ug_bar.place is None)
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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.assertTrue(r.place is 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.assertFalse(r.place is 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').related.get_accessor_name())
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)
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