当节点之间没有直接关系时，从Neo4j中的csvfile向关系添加属性

Question

我有这三个节点（User，Tweet，Token），如：

:User with this property {userID}
:Token with this property {word}
:Tweet with this properties {tweetID, userID, tweetTxt}

目前的关系如下：

(:Tweet)<-[:MADE]-(:User) (:Token)<-[:CONTAINS {tweet_score}]-(:Tweet)

现在考虑以下csv文件：

userToken.csv
_________________________________________
token,userID,score
that_danielle,15990804,0.111140564157
foodies,15990804,0.159946268074
soft-launched,15990804,0.132826927255
email,60730027,0.0561669544423
email,60730027,0.105124263028
email,60730027,0.0453705868273
email,60730027,0.0967876752689
email,32785000,0.101566813224
you,60730027,0.0835723672219

我需要在“CONTAINS”关系中添加一个名为“user_score”的新属性，并且应该从userToken.csv文件中检索此分数。在下面的代码中，我尝试这样做：匹配“p”以包含用户拥有的所有：Token节点（不确定它是否真的有用！），然后使用这些“p”从csv添加“user_score”归档为“CONTAINS”关系：

USING PERIODIC COMMIT 500
LOAD CSV WITH HEADERS FROM "file:///..../userToken.csv" AS csvrow
MATCH p=(u:User)-[*2]->(tok:Token)
with p
where u.userID = toInt(csvrow.userID)
FOREACH (n IN nodes(p)| SET n.user_score = toFloat(csvrow.score) )

这会返回错误：

"csvrow not defined (line 6, column 52 (offset: 258))
"FOREACH (n IN nodes(p)| SET n.user_score = toFloat(csvrow.score) )""

你能帮我解决一下吗？

P.S：不确定我问题的标题：/

Answer 1

USING PERIODIC COMMIT 500
LOAD CSV WITH HEADERS FROM "file:///..../userToken.csv" AS csvrow
MATCH p=(u:User)-[*2]->(tok:Token)
with p
where u.userID = toInt(csvrow.userID)
FOREACH (n IN nodes(p)| SET n.user_score = toFloat(csvrow.score) )

WITH中未传递的所有内容都不可用，因此当您不通过csvrow时，它不会再与查询的其余部分绑定。

然而，你绝对不需要在这里。其次，您的查询会将分数添加到路径中的所有节点，因此在用户节点，推文和令牌上。

如果你想把它放在CONTAINS关系上，你可以这样做：

USING PERIODIC COMMIT 500
LOAD CSV WITH HEADERS FROM "file:///..../userToken.csv" AS csvrow
MATCH (u:User)
where u.userID = toInt(csvrow.userID)
MATCH (u)-[:MADE]->(tweet)-[r:CONTAINS]->(token)
SET r.user_score = csvrow.score

但是，此查询还会将user_score添加到用户节点

评论后编辑（假设令牌节点上的属性键为name：

USING PERIODIC COMMIT 500
LOAD CSV WITH HEADERS FROM "file:///..../userToken.csv" AS csvrow
MATCH (u:User)
where u.userID = toInt(csvrow.userID)
MATCH (u)-[:MADE]->(tweet)-[r:CONTAINS]->(token)
WHERE token.name = csvrow.token
SET r.user_score = csvrow.score