Neo4j Cypher迭代收集，提取和升级文本

Question

Heallo 我有关于存储已实现的逻辑信息流的关系（技术信息流）的集合属性：

SrcApp1 - EntityA - TrgtApp2, 
SrcApp2 - EntityA - TrgtApp3,
SrcApp3 - EntityB - TrgtApp4 

我想更新集合以仅存储实体：

EntityA,
EntityB

Psydo cypher查询：

MATCH (a)-[r]->(b)
For each oldDesc in r.DescriptionSet
newDesc = Split(oldDesc," - ")[1] //get the middle value out of SrcApp1 - EntityA - TrgtApp2
r.DescriptionSetNew.Add(newDesc) 
Next oldDesc

谢谢和最好的问候

Answer 1

这应该有效：

MATCH (a)-[r]->(b)
SET r.fooNew = [d IN r.foo | SPLIT(d, " - ")[1]]
DELETE r.foo;