#10356: proxy models: subclassing models without create a new table
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Reporter: rfk | Owner: nobody
Status: new | Milestone:
Component: Uncategorized | Version: 1.0
Keywords: | Stage: Unreviewed
Has_patch: 0 |
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Following a discussion with Malcolm on django-users, I've implemented
support for what's tentatively named "proxy models". These provide a way
for model subclasses to modify the behaviour of a model without creating a
new database table. The canonical example seems to be subclassing the
User model - you might want to add additional methods/managers/etc, but
you still want to pull data directly from the main users table. Under the
attached patch this would look like the following:
{{{
class MyUser(User)
def extra_method(self):
print "I am a new method"
class Meta:
proxy = True
}}}
MyUser is now simply a different view onto the main User table, rather
than a full-blown subclass with a separate table.
The main body of the patch is to db/models/base.py, where the meta
attributes of proxy models are automatically set up. Since it's now
possible for a model to be using the same (table,primary key) pair as one
of its base classes, I've added a small optimisation in
db/models/sql/query.py that avoids a needless join in this case. There's
also some tests and a first stab at some documentation.
This patch also integrates with (but doesn't require) ticket #3163, by
marking proxy models as unmanaged.
The django-users discussion leading to this patch can be found here:
http://groups.google.com/group/django-
users/browse_thread/thread/fb06ff8e2a296f9c
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Ticket URL: <http://code.djangoproject.com/ticket/10356>
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