Re: DRY and static attribute for multiple classes.

On Tue, Feb 1, 2011 at 10:29 PM, Adrian Bool <aid@logic.org.uk> wrote:
>
> 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).
>

Thanks for the answer Adrian, but I want a class (or static) attribute
shared among all instances of the class. something like

class MyClass(models.Model):
_registry = ['hello',]

# model fields here....

@classmethod
def get_registry(cls):
return cls._registry

@classmethod
def add_registry(cls, str):
return cls._registry.append(str)

--
Marc

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