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Fixed #14043 -- Made sure nullable o2o delete works as expected 

There was an old complaint about nullable one-to-one field cascading
even when the o2o field was saved to None value before the deletion.
Added an test to verify this doesn't happen.

Also some PEP 8 cleanup.
This commit is contained in:
Anssi Kääriäinen 2013-08-20 09:47:43 +03:00
parent e55ca60903
commit b53ed351b3
1 changed files with 21 additions and 13 deletions
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34
tests/one_to_one_regress/tests.py
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@ -25,7 +25,7 @@ class OneToOneRegressionTests(TestCase):
# The bug in #9023: if you access the one-to-one relation *before* # The bug in #9023: if you access the one-to-one relation *before*
# setting to None and deleting, the cascade happens anyway. # setting to None and deleting, the cascade happens anyway.
self.p1.undergroundbar self.p1.undergroundbar
bar.place.name='foo' bar.place.name = 'foo'
bar.place = None bar.place = None
bar.save() bar.save()
self.p1.delete() self.p1.delete()
@ -40,12 +40,12 @@ class OneToOneRegressionTests(TestCase):
Check that we create models via the m2m relation if the remote model Check that we create models via the m2m relation if the remote model
has a OneToOneField. has a OneToOneField.
""" """
f = Favorites(name = 'Fred') f = Favorites(name='Fred')
f.save() f.save()
f.restaurants = [self.r1] f.restaurants = [self.r1]
self.assertQuerysetEqual( self.assertQuerysetEqual(
f.restaurants.all(), f.restaurants.all(),
['<Restaurant: Demon Dogs the restaurant>'] ['<Restaurant: Demon Dogs the restaurant>']
) )
def test_reverse_object_cache(self): def test_reverse_object_cache(self):
@ -114,23 +114,23 @@ class OneToOneRegressionTests(TestCase):
misbehaving. We test both (primary_key=True & False) cases here to misbehaving. We test both (primary_key=True & False) cases here to
prevent any reappearance of the problem. prevent any reappearance of the problem.
""" """
t = Target.objects.create() Target.objects.create()
self.assertQuerysetEqual( self.assertQuerysetEqual(
Target.objects.filter(pointer=None), Target.objects.filter(pointer=None),
['<Target: Target object>'] ['<Target: Target object>']
) )
self.assertQuerysetEqual( self.assertQuerysetEqual(
Target.objects.exclude(pointer=None), Target.objects.exclude(pointer=None),
[] []
) )
self.assertQuerysetEqual( self.assertQuerysetEqual(
Target.objects.filter(pointer2=None), Target.objects.filter(pointer2=None),
['<Target: Target object>'] ['<Target: Target object>']
) )
self.assertQuerysetEqual( self.assertQuerysetEqual(
Target.objects.exclude(pointer2=None), Target.objects.exclude(pointer2=None),
[] []
) )
def test_reverse_object_does_not_exist_cache(self): def test_reverse_object_does_not_exist_cache(self):
@ -235,3 +235,11 @@ class OneToOneRegressionTests(TestCase):
b = UndergroundBar.objects.create() b = UndergroundBar.objects.create()
with self.assertNumQueries(0), self.assertRaises(ValueError): with self.assertNumQueries(0), self.assertRaises(ValueError):
p.undergroundbar = b p.undergroundbar = b
def test_nullable_o2o_delete(self):
u = UndergroundBar.objects.create(place=self.p1)
u.place_id = None
u.save()
self.p1.delete()
self.assertTrue(UndergroundBar.objects.filter(pk=u.pk).exists())
self.assertIsNone(UndergroundBar.objects.get(pk=u.pk).place)