Here is the text of linked stuff for convenience:
For authorization backends checking object level permissions (like
guardian) usually requires calling the django's default authorization
backend as a fallback to the more general set of permissions:
if user.has_perm('foo.change_bar', obj=bar) or user.has_perm('foo.change_bar'):
...
However, this not only looks ugly, but also requires polling of all the
backends twice, and thus, is a performance loss.
First, and possibly the best, solution to this is that, django does not
deny permission if obj argument is provided, but just ignores it. This is
also very logical, one who has a permission for the entire model/table,
would also have it for an instance/row. This way by properly ordering
backends in the settings, it could be a fallback solution for the lower
level checkers. This might be the move in the right direction, although it
is backwards incompatible.
A second solution is a keyword argument, such as fallback_to_model=None,
that will allow lower-level checkers mimic the model level permissions that
django does. Obviously, this is not DRY. But is needed if the first
solution is not accepted to get the necessary permissions with one round of
polling, and without cluttering the code. If it was accepted, it would
still be a useful addition since it would allow backends to prefer to
handle the fallback by themselves. Or, it would allow users who fallback by
default override that behavior and not fallback (via a value of False),
i.e., when object level permissions are definitive.
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