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[英]Create atmost one relationship for newly created node with existing node based on some property
[英]How can I create nodes and create a one-to-many relationship another newly created node?
UNWIND $likedMovies AS likedMovie
MERGE (lm:LikedMovie {
id: likedMovie.id,
name: likedMovie.name,
})
CREATE p = (:Person $person)-[:LIKES]->(lm)
这并不能解决我的问题,因为它为每个likedMovie
创建了一个新 Person 相反,我希望单个Person
与所有likedMovie
相关
我也试过这个:
UNWIND $likedMovies AS likedMovie
MERGE (lm:LikedMovie {
id: likedMovie.id,
name: likedMovie.name,
})
CREATE p = (:Person $person)
FOREACH (lm in likedMovie |
MERGE (p)->[:LIKES]-(lm)
)
但是,它给了我一个错误p
是一个路径并且需要是一个Node
当您分配 p = (:Person) 时,它会创建一个包含节点的路径。 但是如果你分配一个变量 (p:Person),变量 p 就是节点本身。 因此,您可以使用它来创建与 p 一对多的关系。
CREATE (p:Person $person)
UNWIND $likedMovies AS likedMovie
WITH p, likedMovie
MERGE (p)-[:LIKES]->(likedMovie)
这个模板应该可以做到(虽然我不知道$person
中有什么)
CREATE (p:Person {name: $person})
FOREACH(m in $likedMovies |
MERGE (lm:LikedMovie {id: m.id, name: m.name})
MERGE (p)-[:LIKES]->(lm)
)
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