Updating mixin subclassed instances

Hi,

I am using my custom permission mixin on several of my apps's models (not all).

For the case when I need to merge from the "old - context" permission to the "new - context" permission I want to have function which changes the corresponding permission reference attribute in all models, which subclassed this mixin.

How do I know which models subclassed this permission mixin and that they have the inherited permission reference attribute?

In fact I want to have such function in my mixin:

@classmethod
def merge_to(cls, from_perm_context, to_perm_context):

    perm_context_models = []  # How to get this?

    try:
        with transaction.atomic():
            for model in perm_context_models:
                model.objects.filter(
                    perm_context=from_perm_context,
                ).update(perm_context=to_perm_context)
    except IntegrityError as e:  # or DatabaseError
        raise e

Thanks, 

Radek

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