You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
55 lines
1.7 KiB
55 lines
1.7 KiB
""" |
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Regression tests for proper working of ForeignKey(null=True). |
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""" |
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from django.db import models |
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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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def __unicode__(self): |
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return self.comment_text |
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__test__ = {'API_TESTS':""" |
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>>> s = SystemInfo.objects.create(system_name='First forum') |
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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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# Starting from comment, make sure that a .select_related(...) with a specified |
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# set of fields will properly LEFT JOIN multiple levels of NULLs (and the things |
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# that come after the NULLs, or else data that should exist won't). Regression |
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# test for #7369. |
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>>> c = Comment.objects.select_related().get(id=1) |
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>>> c.post |
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<Post: First Post> |
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>>> c = Comment.objects.select_related().get(id=2) |
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>>> print c.post |
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None |
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>>> comments = Comment.objects.select_related('post__forum__system_info').all() |
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>>> [(c.id, c.comment_text, c.post) for c in comments] |
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[(1, u'My first comment', <Post: First Post>), (2, u'My second comment', None)] |
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# Regression test for #7530, #7716. |
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>>> Comment.objects.select_related('post').filter(post__isnull=True)[0].post is None |
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True |
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"""}
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