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44 lines
2.0 KiB
Python
44 lines
2.0 KiB
Python
from django.test import TestCase
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from .models import Article, Author, Comment, Forum, Post, SystemInfo
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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.objects.create(title="No author on this article")
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Article.objects.create(
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author=author_1, title="This article written by Tom Jones"
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)
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Article.objects.create(
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author=author_2, title="This article written by Bob Smith"
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)
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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.assertEqual(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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Comment.objects.create(post=p, comment_text="My first comment")
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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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Comment.objects.create(comment_text="Another first comment")
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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 afterward. 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.assertEqual(len(list(Comment.objects.all())), 4)
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