omat skrev:
> Hi all,
>
> I have a base class common for all my orthogonal models, that is,
> models that hold content for other models, such as tags. This base
> class also has a manager. Here are the classes:
>
>
> class OrthoManager(models.Manager):
> def get_for_object(self, object):
> ctype = ContentType.objects.get_for_model(object)
> return self.filter(content_type__pk=ctype.id,
> object_id=object.id)
>
> def get_for_model(self, model):
> ctype = ContentType.objects.get_for_model(model)
> return self.filter(content_type__pk=ctype.id)
>
>
> class Ortho(models.Model):
> content_type = models.ForeignKey(ContentType,
> editable=False,
> blank=True,
> null=True)
> object_id = models.PositiveIntegerField(blank=True,
> editable=False,
> null=True)
> object = generic.GenericForeignKey('content_type', 'object_id')
>
> objects = OrthoManager()
>
>
> When I define my orthogonal model like that:
>
> class Tag(Ortho):
> tag = models.CharField(maxlength=50)
>
> and try to access its manager, I get a:
>
> Programming Error: relation "models_ortho" does not exist
>
> i.e. it looks for the "models_ortho" table.
>
> If I add:
>
> objects = OrthoManager()
>
> to the Tag model class (the inherited class), it works fine.
>
> It seems that I cannot inherit the manager of the base class. Is this
> by design? Or am I doing something wrong?
>
This is by "current" design - subclassing of models is not supposed to
work yet. Here is a writeup of how it will likely work:
http://code.djangoproject.com/wiki/ModelInheritance
Since this is currently not supposed to work, I would think behavior is
undefined. Thus i would suggest that you do not subclass models, even if
you can get it to work.
Nis Jørgensen
(Eagerly awaiting model inheritance as well)
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