'Resolves models.'

@classmethod
def register(cls):

    for model in cls.get_registered_models():
        pre_save.connect(cls.pre_save_receiver, sender=model)
        post_save.connect(cls.post_save_receiver, sender=model)
        pre_delete.connect(cls.pre_delete_receiver, sender=model)
        post_delete.connect(cls.post_delete_receiver, sender=model)
