django - order_with_respect_to recursive foreign key

I am using Django 1.2.3. I have a table that represents categories and subcategories. For subcategories, it just references a 'parent' primary key from its own table as its parent. It looks something like this:

class Category(models.Model):
    def __unicode__(self):
        return self.name
    class Meta:
        db_tablespace = 'Category'
        verbose_name = 'Category'
        verbose_name_plural = 'Categories'
        ordering = ['display_weight', 'name']
        order_with_respect_to = 'parent'
    name = models.CharField('Category Name', max_length=32)
    parent = models.ForeignKey('self', blank=True, null=True)
    display_weight = models.IntegerField('Display Weight', default=50)

WHen I attempt to validate/sync this database, I get the following error:

AttributeError: 'str' object has no att开发者_开发百科ribute 'get_category_order'

It seems that it won't let me order with respect to a "foreign key" that is recursive. Can anyone explain this. Is there a way around this? There might be several levels of categories and subcategories, but there will never be cyclic references defined in the table.

---

This changeset shows that the your issue has been fixed in the version of django you are using. It is a backport of this changeset.

The issue is discussed here in these tickets:

http://code.djangoproject.com/ticket/2740

http://code.djangoproject.com/ticket/13241

You might want to check if your django has the patched code.