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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def invalidate_model_cache(self):
 """ Invalidate model cache by generating new key for the model. """

        logger.info('Invalidating cache for table {0}'.format(self.model._meta.db_table))
        if django.VERSION >= (1, 8):
            related_tables = set(
                [f.related_model._meta.db_table for f in self.model._meta.get_fields()
                 if ((f.one_to_many or f.one_to_one) and f.auto_created)
                 or f.many_to_one or (f.many_to_many and not f.auto_created)])
        else:
            related_tables = set([rel.model._meta.db_table for rel in self.model._meta.get_all_related_objects()])
            # temporary fix for m2m relations with an intermediate model, goes away after better join caching
            related_tables |= set([field.rel.to._meta.db_table for field in self.model._meta.fields if issubclass(type(field), RelatedField)])

        logger.debug('Related tables of model {0} are {1}'.format(self.model, related_tables))
        update_model_cache(self.model._meta.db_table)
        for related_table in related_tables:
            update_model_cache(related_table)