Hi,
I have a model with a recursive relation:
class Category(models.Model):
name = models.CharField(max_length=100, blank=False,
db_index=True)
parent_category = models.ForeignKey('self',
related_name='child_categories', blank=True, null=True)
And I want it's members to be ordered with respect to the parent
category, like so:
Pets
Pets -> Dogs
Pets -> Cats
Vehicles
Vehicles -> cars
etc.
So that when a product is added, the category selection displays in a
logical order.
So I added to my model definintion the following:
class Meta:
order_with_respect_to = 'parent_category'
All seems well, but when I run: python manage.py syncdb
I get an error:
[...]
File "/usr/lib/python2.5/site-packages/django/db/models/base.py",
line 178, in _prepare
setattr(opts.order_with_respect_to.rel.to, 'get_%s_order' %
cls.__name__.lower(), curry(method_get_order, cls))
AttributeError: 'str' object has no attribute 'get_categoty_order'
This 'str' the error refers to is the 'self' in the foreign key
relation in the model.
This happens whenever you try to order_with_respect_to a model that
has not yet been defined and you refer to it as a string. Which can be
solved in most cases by moving that definition up in the models.py
file and removing the quotes. But in this case the relation is
recursive and the only way to accomplish it is to pass the string
argument 'self' to my ForeignKey.
Has anyone stumbled upon this matter before?
I googled and found people complaining about this but no solutions...
I hope someone can shed some light on the matter...
Thanks,
NicoEchaniz
PS: the documentation[1] doesn't explain if there's a way to make to
ordering work for recursive relations.
http://docs.djangoproject.com/en/dev/ref/models/options/#order-with-respect-to
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