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43 lines
2.0 KiB
Python
43 lines
2.0 KiB
Python
from __future__ import absolute_import
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from django.test import TestCase
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from .models import Author, Article, SystemInfo, Forum, Post, Comment
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class NullFkOrderingTests(TestCase):
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def test_ordering_across_null_fk(self):
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"""
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Regression test for #7512
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ordering across nullable Foreign Keys shouldn't exclude results
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"""
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author_1 = Author.objects.create(name='Tom Jones')
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author_2 = Author.objects.create(name='Bob Smith')
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article_1 = Article.objects.create(title='No author on this article')
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article_2 = Article.objects.create(author=author_1, title='This article written by Tom Jones')
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article_3 = Article.objects.create(author=author_2, title='This article written by Bob Smith')
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# We can't compare results directly (since different databases sort NULLs to
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# different ends of the ordering), but we can check that all results are
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# returned.
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self.assertTrue(len(list(Article.objects.all())) == 3)
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s = SystemInfo.objects.create(system_name='System Info')
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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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s2 = SystemInfo.objects.create(system_name='More System Info')
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f2 = Forum.objects.create(system_info=s2, forum_name='Second forum')
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p2 = Post.objects.create(forum=f2, title='Second Post')
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c3 = Comment.objects.create(comment_text='Another first comment')
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c4 = Comment.objects.create(post=p2, comment_text='Another second comment')
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# We have to test this carefully. Some databases sort NULL values before
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# everything else, some sort them afterwards. So we extract the ordered list
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# and check the length. Before the fix, this list was too short (some values
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# were omitted).
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self.assertTrue(len(list(Comment.objects.all())) == 4)
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