Question

我想使用每个节点和根（主要主题分类）之间返回的最短路径来构建图形。我使用以下查询

 MATCH ()-[:SUBJECT]->(c:Category)
 UNWIND NODES(c) AS nd // to get all the nodes on which I want to iterate
 FOREACH(n in nd|
 WITH n as start
 path = allShortestPaths((start)-[:SUBCAT_OF*]-> (p1:Category {catName:   "Main_topic_classifications"}))
 UNWIND RELATIONSHIPS(path) AS rel
 WITH STARTNODE(rel) AS s, ENDNODE(rel) AS e
 MERGE (s)-[:NEW_SUBCAT]->(e)

 )

对于每个节点c，我尝试计算所有到达根的最短路径，然后使用返回的路径结果创建一个新的关系（NEW_SUBCAT）。但是，当我运行上一个查询时，出现以下错误：

Neo.ClientError.Statement.SyntaxError: Invalid input '(': expected an identifier character, whitespace, NodeLabel, a property map or ')' (line 5, ...)

Answer 1

这个更简单的查询可以满足您的要求（FOREACH完全没有必要）：

MATCH (start:Category)
WHERE ()-[:SUBJECT]->(start)
MATCH path = allShortestPaths((start)-[:SUBCAT_OF*]-> (p1:Category {catName:   "Main_topic_classifications"}))
UNWIND RELATIONSHIPS(path) AS rel
WITH STARTNODE(rel) AS s, ENDNODE(rel) AS e
MERGE (s)-[:NEW_SUBCAT]->(e)

将查询放入foreach

1 个答案: