Neo4j Cypher UNWIND键

Question

我正在尝试创建以下查询：

MATCH (v:Value) 
WHERE v.id = {valueId} 
UNWIND keys(v) AS key 
WITH v, key 
WHERE key CONTAINS 'property.' 
REMOVE key

但它现在失败，出现以下错误：

org.neo4j.driver.v1.exceptions.ClientException: Unexpected end of input: expected an identifier character, whitespace, node labels, '{', a property map, a relationship pattern, '.' or '(' (line 1, column 122 (offset: 121))
"MATCH (v:Value) WHERE v.id = {valueId} WITH v UNWIND keys(v) AS key WITH v, key WHERE key CONTAINS 'property.' REMOVE key"
                                                                                                                         ^ 

此查询有什么问题以及如何解决？

Answer 1

问题不在于密钥上的UNWIND，问题是您指定删除不在图形对象上的东西。

理想情况下，这必须成为：

MATCH (v:Value) 
WHERE v.id = {valueId} 
UNWIND keys(v) AS key 
WITH v, key 
WHERE key CONTAINS 'property.' 
REMOVE v.key

不幸的是，这不起作用，因为属性键不能变化。

APOC的解决方法是在节点上设置已清理的地图：

MATCH (v:Value) 
WHERE v.id = {valueId} 
SET v = apoc.map.clean(properties(v), filter(x IN keys(v) WHERE x CONTAINS 'property.'), [])
RETURN v