I did the following, it works fine:
from django.db import models
class Place(models.Model):
name = models.CharField(max_length=50)
address = models.CharField(max_length=80)
def __unicode__(self):
return self.name
# you can call this on any model object
def object_as_dict(model_object):
return
model_object.__class__.objects.filter(pk=model_object.pk).values()[0]
# If you would like to add this ability to your model objects
# you could define this as a method in Place,
# but let's assume that you don't have access to Place
Place.as_dict = object_as_dict
class Restaurant(Place):
serves_hot_dogs = models.BooleanField()
serves_pizza = models.BooleanField()
class Bar(Place):
has_happy_hour = models.BooleanField()
checks_id = models.BooleanField()
# now you can do like the following:
# >>> from mysite.eatery.models import Place, Restaurant, Bar,
object_as_dict
# >>> p = Place(name="Lee's Tavern", address="Staten Island")
# >>> p.save() # now we have a pre-existing record, IRL you would
fetch it
# >>> r = Restaurant(serves_pizza=True, serves_hot_dogs=False,
**p.as_dict())
# >>> r.save()
On Apr 30, 1:48 pm, medhat <[EMAIL PROTECTED]> wrote:
> Trying to use this idea, I created the following function:
>
> def extend(parent_class, parent_id, child_class, **kwargs):
> p = parent_class.objects.filter(pk=parent_id).values()[0]
> p.update(kwargs)
> c = child_class(**p)
> return c
>
> but that still does not work. It throws an "AttributeError: can't set
> attribute" from line 224 in django\db\models\base.py
>
> --
> Medhat
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