#17299: The proxy model does not allow one to use ManyToMany fields
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Reporter: anonymous | Owner: nobody
Type: Bug | Status: new
Component: Database layer (models, ORM) | Version: 1.3
Severity: Normal | Keywords:
Triage Stage: Unreviewed | Has patch: 0
Easy pickings: 0 | UI/UX: 0
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Suppose I have an app where the users may write messages. Then suppose
that users must be able to follow one another in a twitter-like fashion.
As far as I see, the most clean solution will be to create a non-
symmetrical self-referencing m2m relation on the contrib.auth.models.User.
Editing the code in contrib.auth.models.User itself will be naturally be
an outrage, so I'll need to define a model inheriting from User and define
the m2m relation there but this will lead to the creation of a new DB
table for the descendant which will contain only the id field. In order to
avoid this, one would suppose that he should be able to define the
descendant as a proxy model, as the new m2m relation doesn't really affect
the database representation of contrib.auth.User besides creating foreign
keys to the intermediary model.
Unfortunately, the following code will result in
"django.core.exceptions.FieldError: Proxy model 'MyUser' contains model
fields":
{{{
from django.contrib.auth import models
class MyUser(models.User):
subscription = models.ManyToMany('self', symmetrical=False)
class Meta:
proxy = True
}}}
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Ticket URL: <https://code.djangoproject.com/ticket/17299>
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