Re: DRY and static attribute for multiple classes.

On 1 Feb 2011, at 21:05, Marc Aymerich wrote:

> Hi all,
> I want to provide an encapsulated static attribute called _registry
> for several classes.
>
> I try to use inheritance in order to make it DRY: all classes inherit
> from a BaseClass that implements the _registry encapsulation. But with
> inheritance it doesn't work how I want, because a single instance of
> the _registry is shared between all of the inherited classes, and I
> want to have an independent _registry for every class.
>
> How can I do that without coping all the code in every class?

Create your base class with the _registry attribute like so,

class MyBaseClass(models.Model)
_registry = models.IntegerField()
class Meta:
abstract = True

With 'abstract = True'; when you inherit from MyBaseClass the child classes will have their own _registry columns in the DB (rather than sharing a common table).

Cheers,

aid

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