Hi,
I wonder whether there's a way to achieve the following: Let's assume
I've two models User and Fav with a 1-to-many relation. Favs have a
rating.
Now, I'm interested in a User's highest rated Fav. I could create a
custom function or User instance method to call
"user.favs.filter(..).order_by(...)[0]", but can I also create a
function in such a way that the call will look like
"user.favs.best()"?
For models, I can overwrite the Manager and create custom methods. Can
I also customize the RelatedManager "user.favs"?
Thanks,
PS: I looked into the source and guessing from that rather complex
meta-programming code, I'm afraid, it cannot be done. The
RelatedManager of a ForeignRelatedObjectsDescriptor is based on the
related object's default manager. A way to extend this might be this:
class Fav(models.Model):
user = models.ForeignKey(User, related_name='favs')
class user_favs_mixin:
def best(self): ...
The ForeignRelatedObjectsDescriptor would the look for the innerclass
and add it to the list of superclases of its dynamic RelatedManager
class definition. But it might be too much magic...
--
Stefan Matthias Aust
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