/tests/regressiontests/null_fk_ordering/tests.py
Python | 39 lines | 24 code | 5 blank | 10 comment | 0 complexity | 18a456d3bc630aa66c9b318edc861b9f MD5 | raw file
Possible License(s): BSD-3-Clause
- from django.test import TestCase
- from regressiontests.null_fk_ordering.models import *
- class NullFkOrderingTests(TestCase):
- def test_ordering_across_null_fk(self):
- """
- Regression test for #7512
- ordering across nullable Foreign Keys shouldn't exclude results
- """
- author_1 = Author.objects.create(name='Tom Jones')
- author_2 = Author.objects.create(name='Bob Smith')
- article_1 = Article.objects.create(title='No author on this article')
- article_2 = Article.objects.create(author=author_1, title='This article written by Tom Jones')
- article_3 = Article.objects.create(author=author_2, title='This article written by Bob Smith')
- # We can't compare results directly (since different databases sort NULLs to
- # different ends of the ordering), but we can check that all results are
- # returned.
- self.assertTrue(len(list(Article.objects.all())) == 3)
- s = SystemInfo.objects.create(system_name='System Info')
- f = Forum.objects.create(system_info=s, forum_name='First forum')
- p = Post.objects.create(forum=f, title='First Post')
- c1 = Comment.objects.create(post=p, comment_text='My first comment')
- c2 = Comment.objects.create(comment_text='My second comment')
- s2 = SystemInfo.objects.create(system_name='More System Info')
- f2 = Forum.objects.create(system_info=s2, forum_name='Second forum')
- p2 = Post.objects.create(forum=f2, title='Second Post')
- c3 = Comment.objects.create(comment_text='Another first comment')
- c4 = Comment.objects.create(post=p2, comment_text='Another second comment')
- # We have to test this carefully. Some databases sort NULL values before
- # everything else, some sort them afterwards. So we extract the ordered list
- # and check the length. Before the fix, this list was too short (some values
- # were omitted).
- self.assertTrue(len(list(Comment.objects.all())) == 4)