neo4j - 在 Neo4j 中添加触发器时无法创建关系

Question

我用 apoc.trigger.add 创建了一个触发器：

CALL apoc.trigger.add('increase_followings_and_followers',
'UNWIND {createdRelationships} AS rel 
WITH rel, STARTNODE(rel) as follower, ENDNODE(rel) AS followed WITH rel, follower, followed
WHERE TYPE(rel)="FOLLOW" and labels(followed)="User" and labels(follower)="User" 
SET follower.followings = follower.followings +1, followed.followers= followed.followers+1',
{phase:'after'})

我建立了一个社交网络，当用户关注另一个用户时，触发器将自动增加关注者数量和关注者数量。但它不起作用，我无法在两个用户节点之间创建新关系“FOLLLOW”

Answer 1

节点上的标签是一个集合，因此您需要使用 IN 运算符：

WHERE TYPE(rel)="FOLLOW" 
AND "User" IN labels(followed)
AND "User" IN labels(follower)