#10808: Multiple inheritance (model-based) broken for __init__ of common fields
in
diamond inheritance
------------------------------------------+---------------------------------
Reporter: mikemintz | Owner: nobody
Status: new | Milestone:
Component: Database layer (models, ORM) | Version: SVN
Keywords: | Stage: Unreviewed
Has_patch: 0 |
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I am using the latest version of Django SVN r10558.
My models are:
{{{
class Restaurant(models.Model):
name = models.CharField(max_length=255)
class Bar(Restaurant):
min_age = models.IntegerField()
class Pizzeria(Restaurant):
specialty = models.CharField(max_length=255)
class PizzeriaBar(Bar, Pizzeria):
pizza_bar_specific_field = models.CharField(max_length=255)
}}}
This yields the following inheritance diagram:
{{{
Model
|
Restaurant
/ \
Bar Pizzeria
\ /
BarPizzeria
}}}
My problem is that setting the name field in !PizzeriaBar.!__init!__ does
not work.
{{{
>>> p = PizzeriaBar(name="Michaels", min_age=21, specialty="Cheese",
pizza_bar_specific_field="Doodle")
>>> print (p.name, p.min_age, p.specialty, p.pizza_bar_specific_field)
('', 21, 'Cheese', 'Doodle')
>>> p = PizzeriaBar()
>>> p.name = "Michaels"
>>> p.min_age = 21
>>> p.specialty = "Cheese"
>>> p.pizza_bar_specific_field = "Doodle"
>>> print (p.name, p.min_age, p.specialty, p.pizza_bar_specific_field)
('Michaels', 21, 'Cheese', 'Doodle')
}}}
So this problem only comes up when you are using multiple inheritance, and
you set a field defined in a shared superclass of the current model's
superclasses (i.e., diamond inheritance). I know diamond inheritance isn't
great to use, but it's useful in my application (in which most models
inherit from a top-level Item model), and since it works when using
setattr, it seems like it should be possible to work in !__init!__.
--
Ticket URL: <http://code.djangoproject.com/ticket/10808>
Django <http://code.djangoproject.com/>
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