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87 lines
3.0 KiB
Python
87 lines
3.0 KiB
Python
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"""
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Regression tests for proper working of ForeignKey(null=True). Tests these bugs:
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* #7512: including a nullable foreign key reference in Meta ordering has un
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xpected results
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"""
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from django.db import models
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# The first two models represent a very simple null FK ordering case.
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class Author(models.Model):
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name = models.CharField(max_length=150)
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class Article(models.Model):
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title = models.CharField(max_length=150)
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author = models.ForeignKey(Author, null=True)
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def __unicode__(self):
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return u'Article titled: %s' % (self.title, )
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class Meta:
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ordering = ['author__name', ]
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# These following 4 models represent a far more complex ordering case.
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class SystemInfo(models.Model):
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system_name = models.CharField(max_length=32)
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class Forum(models.Model):
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system_info = models.ForeignKey(SystemInfo)
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forum_name = models.CharField(max_length=32)
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class Post(models.Model):
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forum = models.ForeignKey(Forum, null=True)
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title = models.CharField(max_length=32)
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def __unicode__(self):
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return self.title
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class Comment(models.Model):
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post = models.ForeignKey(Post, null=True)
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comment_text = models.CharField(max_length=250)
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class Meta:
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ordering = ['post__forum__system_info__system_name', 'comment_text']
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def __unicode__(self):
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return self.comment_text
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__test__ = {'API_TESTS': """
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# Regression test for #7512 -- ordering across nullable Foreign Keys shouldn't
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# exclude results
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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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>>> len(list(Article.objects.all())) == 3
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True
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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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>>> len(list(Comment.objects.all())) == 4
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True
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"""
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}
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