id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
14471	db.models.Model regression - can't override some methods	Lucky	nobody	"I want to migrate my project from the django-1.1.2 to the django 1.2.3 and I have problem with custom model managers what overrides Manager.create() method. For example:

{{{
class Book(models.Model):
    title = models.CharField(max_length=10)
    author = models.ForeignKey(Author)
    objects = CustomManager()

class CustomManager(models.Manager):
    def create(self, **kwargs):
        # business logic here
        return super(CustomManager, self).create(**kwargs)
}}}

Django 1.2.3 uses the CustomManager.create() method on the 'objects' descriptor as expected.
{{{
Book.objects.create(author=a1, title='How to be smart')
}}}

In the django-1.1.2 the same behavior had related field 'book_set' descriptor . 
But in the 1.2.3 CustomManager.create() does not called anymore on related field. The next code has different behavior:

{{{
author.book_set.create(title='How to program')
}}}

The difference in the implementation for `create` method in the RelatedManger class. In the 1.1.2 it was delegate result to the create() method of it superclass (CustomManager).

{{{
return super(RelatedManager, self).create(**kwargs)
}}}
http://code.djangoproject.com/browser/django/tags/releases/1.1.2/django/db/models/fields/related.py#L367

But the 1.2. delegates result to the result of .using(db), what is not superclass, but QuerySet.
{{{
return super(RelatedManager, self).using(db).create(**kwargs)
}}}
http://code.djangoproect.com/browser/django/trunk/django/db/models/fields/related.py#L423

Look for the actual test case in the attachement. I'm Sorry for my silly english.
"		new	Database layer (models, ORM)	1.2					Unreviewed	0	0	0	0	0	0