On Thursday, March 3, 2011 5:33:56 PM UTC+2, bruno desthuilliers wrote:
>
> On 3 mar, 15:16, kost BebiX <[email protected]> wrote:
> > Yes, that's more a Python problem, not specifically django.
> >
> > You would normally do:
> >
> > class User(models.Model):
> > def __init__(self):
> > name = ...
> >
> > but this looks not cool) That's why most of python libraries use
> "declarative" syntax to describe models:
> >
> > class User(models.Model):
> > name = ...
>
>
> It has nothing to do with "looking cool" or anything like that. Using
> models.fields as class attributes in models class statement's body
> allow for the ORM to know what db fields and relations your table has
> - not what instance attributes a model instance will have. Well, not
> directly at least - of course the Model base case makes sure your
> instance will have corresponding instance attributes (for db fields),
> but note that these instance attributes are just plain python
> attributes, NOT the models.fields you defined at the class level.
>
>
Maybe you misunderstand what I was talking about. Doing
class A():
b = SomeFieldType()
will require the "powerful python object model" (oh, I like that :-) to put
in A's instance instance-variable b after all that. You say:
> Using models.fields as class attributes in models class statement's
body allow for the ORM to know what db fields and relations your table has -
not what instance attributes a model instance will have."
Yes. But more natural way would be to do something like
class A():
schema = {
'b': {'type': 'SomeType'}
}
And that would describe class's A attribute schema that would be
class-instance attribute from beginning till end (if there's no more magic),
but that looks ugly and broken.
Where am I wrong?
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