mirror of https://github.com/django/django.git
96 lines
3.3 KiB
Python
96 lines
3.3 KiB
Python
"""
|
|
Regression tests for proper working of ForeignKey(null=True). Tests these bugs:
|
|
|
|
* #7512: including a nullable foreign key reference in Meta ordering has un
|
|
xpected results
|
|
|
|
"""
|
|
|
|
from django.db import models
|
|
|
|
# The first two models represent a very simple null FK ordering case.
|
|
class Author(models.Model):
|
|
name = models.CharField(max_length=150)
|
|
|
|
class Article(models.Model):
|
|
title = models.CharField(max_length=150)
|
|
author = models.ForeignKey(Author, null=True)
|
|
|
|
def __unicode__(self):
|
|
return u'Article titled: %s' % (self.title, )
|
|
|
|
class Meta:
|
|
ordering = ['author__name', ]
|
|
|
|
|
|
# These following 4 models represent a far more complex ordering case.
|
|
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)
|
|
|
|
class Meta:
|
|
ordering = ['post__forum__system_info__system_name', 'comment_text']
|
|
|
|
def __unicode__(self):
|
|
return self.comment_text
|
|
|
|
class Comment(models.Model):
|
|
post = models.ForeignKey(Post, null=True)
|
|
comment_text = models.CharField(max_length=250)
|
|
|
|
class Meta:
|
|
ordering = ['post__forum__system_info__system_name', 'comment_text']
|
|
|
|
def __unicode__(self):
|
|
return self.comment_text
|
|
|
|
__test__ = {'API_TESTS': """
|
|
# Regression test for #7512 -- ordering across nullable Foreign Keys shouldn't
|
|
# exclude results
|
|
>>> author_1 = Author.objects.create(name='Tom Jones')
|
|
>>> author_2 = Author.objects.create(name='Bob Smith')
|
|
>>> article_1 = Article.objects.create(title='No author on this article')
|
|
>>> article_2 = Article.objects.create(author=author_1, title='This article written by Tom Jones')
|
|
>>> article_3 = Article.objects.create(author=author_2, title='This article written by Bob Smith')
|
|
|
|
# We can't compare results directly (since different databases sort NULLs to
|
|
# different ends of the ordering), but we can check that all results are
|
|
# returned.
|
|
>>> len(list(Article.objects.all())) == 3
|
|
True
|
|
|
|
>>> s = SystemInfo.objects.create(system_name='System Info')
|
|
>>> 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')
|
|
>>> s2 = SystemInfo.objects.create(system_name='More System Info')
|
|
>>> f2 = Forum.objects.create(system_info=s2, forum_name='Second forum')
|
|
>>> p2 = Post.objects.create(forum=f2, title='Second Post')
|
|
>>> c3 = Comment.objects.create(comment_text='Another first comment')
|
|
>>> c4 = Comment.objects.create(post=p2, comment_text='Another second comment')
|
|
|
|
# We have to test this carefully. Some databases sort NULL values before
|
|
# everything else, some sort them afterwards. So we extract the ordered list
|
|
# and check the length. Before the fix, this list was too short (some values
|
|
# were omitted).
|
|
>>> len(list(Comment.objects.all())) == 4
|
|
True
|
|
|
|
"""
|
|
}
|