mirror of https://github.com/django/django.git
43 lines
1.8 KiB
Python
43 lines
1.8 KiB
Python
from django.test import TestCase
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from regressiontests.null_fk.models import *
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class NullFkTests(TestCase):
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def test_null_fk(self):
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d = SystemDetails.objects.create(details='First details')
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s = SystemInfo.objects.create(system_name='First forum', system_details=d)
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f = Forum.objects.create(system_info=s, forum_name='First forum')
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p = Post.objects.create(forum=f, title='First Post')
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c1 = Comment.objects.create(post=p, comment_text='My first comment')
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c2 = Comment.objects.create(comment_text='My second comment')
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# Starting from comment, make sure that a .select_related(...) with a specified
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# set of fields will properly LEFT JOIN multiple levels of NULLs (and the things
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# that come after the NULLs, or else data that should exist won't). Regression
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# test for #7369.
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c = Comment.objects.select_related().get(id=1)
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self.assertEqual(c.post, p)
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self.assertEqual(Comment.objects.select_related().get(id=2).post, None)
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self.assertQuerysetEqual(
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Comment.objects.select_related('post__forum__system_info').all(),
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[
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(1, u'My first comment', '<Post: First Post>'),
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(2, u'My second comment', 'None')
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],
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transform = lambda c: (c.id, c.comment_text, repr(c.post))
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)
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# Regression test for #7530, #7716.
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self.assertTrue(Comment.objects.select_related('post').filter(post__isnull=True)[0].post is None)
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self.assertQuerysetEqual(
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Comment.objects.select_related('post__forum__system_info__system_details'),
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[
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(1, u'My first comment', '<Post: First Post>'),
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(2, u'My second comment', 'None')
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],
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transform = lambda c: (c.id, c.comment_text, repr(c.post))
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)
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