/tests/regressiontests/null_fk_ordering/tests.py
Python | 39 lines | 24 code | 5 blank | 10 comment | 0 complexity | 18a456d3bc630aa66c9b318edc861b9f MD5 | raw file
1from django.test import TestCase 2 3from regressiontests.null_fk_ordering.models import * 4 5class NullFkOrderingTests(TestCase): 6 7 def test_ordering_across_null_fk(self): 8 """ 9 Regression test for #7512 10 11 ordering across nullable Foreign Keys shouldn't exclude results 12 """ 13 author_1 = Author.objects.create(name='Tom Jones') 14 author_2 = Author.objects.create(name='Bob Smith') 15 article_1 = Article.objects.create(title='No author on this article') 16 article_2 = Article.objects.create(author=author_1, title='This article written by Tom Jones') 17 article_3 = Article.objects.create(author=author_2, title='This article written by Bob Smith') 18 19 # We can't compare results directly (since different databases sort NULLs to 20 # different ends of the ordering), but we can check that all results are 21 # returned. 22 self.assertTrue(len(list(Article.objects.all())) == 3) 23 24 s = SystemInfo.objects.create(system_name='System Info') 25 f = Forum.objects.create(system_info=s, forum_name='First forum') 26 p = Post.objects.create(forum=f, title='First Post') 27 c1 = Comment.objects.create(post=p, comment_text='My first comment') 28 c2 = Comment.objects.create(comment_text='My second comment') 29 s2 = SystemInfo.objects.create(system_name='More System Info') 30 f2 = Forum.objects.create(system_info=s2, forum_name='Second forum') 31 p2 = Post.objects.create(forum=f2, title='Second Post') 32 c3 = Comment.objects.create(comment_text='Another first comment') 33 c4 = Comment.objects.create(post=p2, comment_text='Another second comment') 34 35 # We have to test this carefully. Some databases sort NULL values before 36 # everything else, some sort them afterwards. So we extract the ordered list 37 # and check the length. Before the fix, this list was too short (some values 38 # were omitted). 39 self.assertTrue(len(list(Comment.objects.all())) == 4)