[patch] allow get_object_or_404 and get_list_or_404 shortcuts to be passed Manager objects

[Gary Wilson <gary.wilson@…>]

By allowing get_object_or_404 and get_list_or_404 to be passed Manager instances, you can use the shortcut with related models. For example with the models:

class Author(models.Model):
    name = models.CharField(maxlength=50)

class Article(models.Model):
    author = models.ForeignKey(Author)
    title = models.CharField(maxlength=50)

you could do something like:

author = Author.objects.get(name="Brave Sir Robin")
article = get_object_or_404(author.article_set, title="Run away!")
articles = get_list_or_404(author.article_set, title__contains="Camelot")

[Gary Wilson <gary.wilson@…>]

added modeltests for get_object_or_404

[Gary Wilson <gary.wilson@…>]

added a test for custom manager

[Russell Keith-Magee]

(In [4275]) Fixed #2756 -- Modified the get_object_or_404/get_list_or_404 shortcuts to accept model managers as well as model classes. Thanks, Gary Wilson.