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