mirror of
https://github.com/django/django.git
synced 2024-12-24 18:16:19 +00:00
31d9dc07aa
git-svn-id: http://code.djangoproject.com/svn/django/trunk@7597 bcc190cf-cafb-0310-a4f2-bffc1f526a37
56 lines
1.8 KiB
Python
56 lines
1.8 KiB
Python
"""
|
|
Regression tests for proper working of ForeignKey(null=True). Tests these bugs:
|
|
|
|
* #7369: FK non-null after null relationship on select_related() generates an invalid query
|
|
|
|
"""
|
|
|
|
from django.db import models
|
|
|
|
class SystemInfo(models.Model):
|
|
system_name = models.CharField(max_length=32)
|
|
|
|
class Forum(models.Model):
|
|
system_info = models.ForeignKey(SystemInfo)
|
|
forum_name = models.CharField(max_length=32)
|
|
|
|
class Post(models.Model):
|
|
forum = models.ForeignKey(Forum, null=True)
|
|
title = models.CharField(max_length=32)
|
|
|
|
def __unicode__(self):
|
|
return self.title
|
|
|
|
class Comment(models.Model):
|
|
post = models.ForeignKey(Post, null=True)
|
|
comment_text = models.CharField(max_length=250)
|
|
|
|
def __unicode__(self):
|
|
return self.comment_text
|
|
|
|
__test__ = {'API_TESTS':"""
|
|
|
|
>>> s = SystemInfo.objects.create(system_name='First forum')
|
|
>>> f = Forum.objects.create(system_info=s, forum_name='First forum')
|
|
>>> p = Post.objects.create(forum=f, title='First Post')
|
|
>>> c1 = Comment.objects.create(post=p, comment_text='My first comment')
|
|
>>> c2 = Comment.objects.create(comment_text='My second comment')
|
|
|
|
# Starting from comment, make sure that a .select_related(...) with a specified
|
|
# set of fields will properly LEFT JOIN multiple levels of NULLs (and the things
|
|
# that come after the NULLs, or else data that should exist won't).
|
|
>>> c = Comment.objects.select_related().get(id=1)
|
|
>>> c.post
|
|
<Post: First Post>
|
|
>>> c = Comment.objects.select_related().get(id=2)
|
|
>>> print c.post
|
|
None
|
|
|
|
>>> comments = Comment.objects.select_related('post__forum__system_info').all()
|
|
>>> [(c.id, c.post.id) for c in comments]
|
|
[(1, 1), (2, None)]
|
|
>>> [(c.comment_text, c.post.title) for c in comments]
|
|
[(u'My first comment', u'First Post'), (u'My second comment', None)]
|
|
|
|
"""}
|