#30756: ModelForm does not work well with the override field on Inherited Model
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Reporter: ramon | Owner: nobody
Type: Bug | Status: new
Component: Database | Version: 2.2
layer (models, ORM) |
Severity: Normal | Keywords:
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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Following the samples:
{{{
class City(models.Model):
name = models.CharField(max_length=100)
class AddressBase(models.Model):
city = models.ForeignKey(City, on_delete=models.PROTECT)
...
country = models.ForeignKey(...)
class Meta:
abstract = True
class Address(AddressBase):
city = models.CharField(max_length=100)
class AddessForm(forms.ModelForm):
class Meta:
model = Address
fields = ("city", )
}}}
I expect a rendered form with the city field as a CharField, but I got the
following error:
{{{ Cannot assign "''": "Address.city" must be a "City" instance. }}}
The problem, I think, is with the code above, on
models.Field.contribute_to_class
{{{
if self.column:
# Don't override classmethods with the descriptor. This means
that
# if you have a classmethod and a field with the same name,
then
# such fields can't be deferred (we don't have a check for
this).
if not getattr(cls, self.attname, None):
setattr(cls, self.attname,
DeferredAttribute(self.attname))
}}
--
Ticket URL: <https://code.djangoproject.com/ticket/30756>
Django <https://code.djangoproject.com/>
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