#30427: Descriptors not accessible for inherited models.
-------------------------------------+-------------------------------------
Reporter: Jarek | Owner: nobody
Glowacki |
Type: Bug | Status: new
Component: Database | Version: master
layer (models, ORM) | Keywords: inherited
Severity: Normal | descriptor deferred
Triage Stage: | Has patch: 0
Unreviewed |
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 0
UI/UX: 0 |
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Example:
{{{
class Base(models.Model):
A = 1
class Inherited(Base):
A = models.IntegerField(default=0)
B = models.IntegerField(default=0)
}}}
And now take a look at this:
{{{
>>> Inherited.A
1
>>> Inherited.B
<django.db.models.query_utils.DeferredAttribute object at 0x110ed5470>
}}}
Descriptor `A` is not accessible.
Behaviour is correct when accessing instance attributes, which is why I
think this has gone under the radar..
Real use case:
We try to apply a `FieldTracker` (from Django Model Utils) onto a custom
user model:
{{{
class User(AbstractBaseUser):
is_active = models.BooleanField(_('active'), default=True)
tracker = FieldTracker()
}}}
FieldTracker falls over wrapping the `is_active` field, because instead of
getting a `DeferredAttribute` when accessing `User.is_active`, it gets a
mouthful of `True`, which is the value assigned to `is_active` in
`AbstractBaseUser`.
Happy to submit a failing test and propose a fix if issue is accepted.
Issue replicated on Django2.1.5, but I suspect it's like this on master
still..
--
Ticket URL: <https://code.djangoproject.com/ticket/30427>
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