What I found useful sometimes, was to store the content_type_id of the
object, so when I open the parent class, I can change the type to the right
subclass.
For example:
from django.contrib.contenttypes.models import ContentType
class Parent(models.Model):
content_type = models.ForeignKey(ContentType)
def save(self, *args, **kwargs):
self.content_type = ContentType.objects.get_for_model(self)
super(Parent, self).save(*args, **kwargs) # Call the "real" save()
method.
def get_real(self):
return self.content_type.model_class().objects.get(pk=self.pk)
Can that help?
On Sunday, August 5, 2012 7:53:51 AM UTC+2, . wrote:
>
> > But assuming you just want to set up a default, and be able to override
> it at will, you can always do:
> > class Foo:
> > def default_name(self):
> > return 'Foo'
> > name = CharField(default=default_name)
>
> > Class Bar(Foo):
> > def default_name(self):
> > return "Bar"
>
> This looks right but I can't check it.
>
> There is a class (let's call it Foo) which is a subclass of User.
> Foo has the following line in its Meta:
> proxy = True
>
> When I try to validate my models this error appears:
> django.core.exceptions.FieldError: Proxy model 'Foo' contains model
> fields.
>
> I will get another error if I remove "proxy = True":
>
> Error: One or more models did not validate:
> app.foo: Accessor for field 'user_ptr' clashes with related field
> 'User.foo'. Add a related_name argument to the definition for
> 'user_ptr'.
>
> I've read a doc page on inheritance but I don't know how to fix these
> errors.
>
>
> Thanks
>
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