使用py2n删除特定关系

Question

假设我们有两个节点，User和Post。关系，比如upvote，可以存在为（：User）-[upvote]->；（：Post）

如果以下查询结果为非空列表，则我希望删除该关系：

        rel_list = list(graph.match(start_node=user, end_node=post, rel_type="UPVOTED")
        if len(rel_list) > 0:
            # delete the relationship from the graph
        else:
            # create the relationship
            rel = Relationship(user, "UPVOTED", post)
            graph.create_unique(rel)

Answer 1

回答我自己的问题，希望这对其他人也有帮助。在

    rel_list = list(graph.match(start_node=user, end_node=post, rel_type="UPVOTED")
    if len(rel_list) > 0:
        # delete the relationship from the graph
        # fetch the ID of the relationship -> rel_id
        query = '''
        MATCH (a:NeoZotr)-[r:LIKED]->(b:NeoZot)
        WHERE ID(r) = {x}
        DELETE r
        '''
        graph.cypher.execute(query,x=rel_id)
    else:
        # create the relationship
        rel = Relationship(user, "UPVOTED", post)
        graph.create_unique(rel)

如果最后出现TypeError（就像在我的例子中一样），那么您获取的rel\uid可能是unicode样式。在这种情况下传递int（rel_id）。在