docs: def fetch_local(self, org, identity):
          """
          Fetches the local model instance with the given identity, returning none if it doesn't exist
          :param org: the org
          :param identity: the unique identity
          :return: the instance or none
          """
          qs = self.fetch_all(org=org).filter(**{self.local_id_attr: identity})
  
          if self.select_related:
              qs = qs.select_related(*self.select_related)
          if self.prefetch_related:
              qs = qs.prefetch_related(*self.prefetch_related)
  
          return qs.first()