On Wed, Aug 19, 2009 at 12:56 PM, Idan Gazit <i...@pixane.net> wrote:
>
> Hey all,
>
> I'd like to add some custom exception to a model of mine,
> Foo.FrobNotAllowed, along the lines of ModelName.DoesNotExist.
>
> From looking at models/base.py, it looks like the pattern is to
> override __new__() and use add_to_class. Something like:
>
> def __new__(cls, name, bases, attrs):
> new_class = super(MyModel, cls).__new__(cls, name, bases, attrs)
> abstract = getattr(attr_meta, 'abstract', False)
> if not abstract:
> new_class.add_to_class('FrobNotAllowed', MyExceptionClass)
> return new_class
>
> Is this the pattern I should be emulating for the kind of thing I'm
> seeking?
All you really need is:
class DoesNotExist(Exception):
pass
I generally create a Utils app in my project with a modelUtils.py where I
put things like that. Then you can just import the exception and use it in
any of your models.py files.
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