#17043: Model subclass field named the same as one of the parent model
subclasses
clashes
----------------------------------------------+--------------------
Reporter: charettes | 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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The following model inheritance should raise a warning on model
validation:
{{{
#!python
from django.db import models
class A(models.Model):
pass
class B(A):
pass
class C(A):
b = models.BooleanField()
print A.b
#<django.db.models.fields.related.SingleRelatedObjectDescriptor object at
0x1b08e10>
print B.b
#<django.db.models.fields.related.SingleRelatedObjectDescriptor object at
0x1b08e10>
print C.b
#<django.db.models.fields.related.SingleRelatedObjectDescriptor object at
0x1b08e10>
C.objects.create(b=False)
#ValueError: Cannot assign "False": "C.b" must be a "B" instance.
}}}
Took me some time before figuring out what was happening. Feel free to
rename the ticket with a more descriptive title.
Is there a reason why the {{{RelatedObjectDescriptor}}} is also added to
the subclasses of {{{A}}} and not only the parent model? Lets say I have a
{{{c = C}}} instance, theres no way {{{c.b}}} might return something, only
{{{a = A}}} might do?
--
Ticket URL: <https://code.djangoproject.com/ticket/17043>
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