def pre_delete(self, sender, instance, **kwargs):
        remove_similarities.delay(rated_model=model_path(sender), object_id=instance.id)
        remove_suggestions.delay(rated_model=model_path(sender), object_id=instance.id)
This function gets called when a signal in ``self.rate_signals`` is
dataset/ETHPy150Open fcurella/django-recommends/recommends/providers/__init__.py/RecommendationProvider.pre_delete