def METHOD_NAME(self) -> Iterator[GraphRelationship]:
    if not self.start_label:
        raise Exception('Required relation start node label cannot be None')
    if not self.start_key:
        raise Exception('Required relation start key cannot be None')
    if not self.description_key:
        raise Exception('Required relation end key cannot be None')
    yield self.get_relation(
        start_node=self.start_label,
        start_key=self.start_key,
        end_key=self.description_key
    )