Neo4J Cypher 查询中的属性值只能是原始类型或其数组

Question

我有以下params一组：

:params "userId":"15229100-b20e-11e3-80d3-6150cb20a1b9",
"contextNames":[{"uid":"94e71bf0-1e7d-11e9-8f33-4f0c99ea0da1","name":"zhora"}],
"statements":[{"text":"oranges apples bananas","concepts":["orange","apple","banana"],
"mentions":[],"timestamp":15481867295710000,"name":"# banana","uid":"34232870-1e7f-11e9-8609-a7f6b478c007",
"uniqueconcepts":[{"name":"orange","suid":"34232870-1e7f-11e9-8609-a7f6b478c007","timestamp":15481867295710000},{"name":"apple","suid":"34232870-1e7f-11e9-8609-a7f6b478c007","timestamp":15481867295710000},{"name":"banana","suid":"34232870-1e7f-11e9-8609-a7f6b478c007","timestamp":15481867295710000}],"uniquementions":[]}],"timestamp":15481867295710000,"conceptsRelations":[{"from":"orange","to":"apple","context":"94e71bf0-1e7d-11e9-8f33-4f0c99ea0da1","statement":"34232870-1e7f-11e9-8609-a7f6b478c007","user":"15229100-b20e-11e3-80d3-6150cb20a1b9","timestamp":15481867295710000,"uid":"apoc.create.uuid()","gapscan":"2","weight":3},{"from":"apple","to":"banana","context":"94e71bf0-1e7d-11e9-8f33-4f0c99ea0da1","statement":"34232870-1e7f-11e9-8609-a7f6b478c007","user":"15229100-b20e-11e3-80d3-6150cb20a1b9","timestamp":15481867295710002,"uid":"apoc.create.uuid()","gapscan":"2","weight":3},{"from":"orange","to":"banana","context":"94e71bf0-1e7d-11e9-8f33-4f0c99ea0da1","statement":"34232870-1e7f-11e9-8609-a7f6b478c007","user":"15229100-b20e-11e3-80d3-6150cb20a1b9","timestamp":15481867295710002,"uid":"apoc.create.uuid()","gapscan":4,"weight":2}],"mentionsRelations":[] 

然后当我进行以下查询时：

MATCH (u:User {uid: $userId}) 
UNWIND $contextNames as contextName 
MERGE (context:Context {name:contextName.name,by:u.uid,uid:contextName.uid}) 
ON CREATE SET context.timestamp=$timestamp 
MERGE (context)-[:BY{timestamp:$timestamp}]->(u) 
WITH u, context 
UNWIND $statements as statement 
CREATE (s:Statement {name:statement.name, text:statement.text, uid:statement.uid, timestamp:statement.timestamp}) 
CREATE (s)-[:BY {context:context.uid,timestamp:s.timestamp}]->(u) 
CREATE (s)-[:IN {user:u.id,timestamp:s.timestamp}]->(context)  
WITH u, s, context, statement 
FOREACH (conceptName in statement.uniqueconcepts |  
MERGE (c:Concept {name:conceptName}) ON CREATE SET c.uid=apoc.create.uuid() 
CREATE (c)-[:BY {context:context.uid,timestamp:s.timestamp,statement:s.suid}]->(u) 
CREATE (c)-[:OF {context:context.uid,user:u.uid,timestamp:s.timestamp}]->(s)  
CREATE (c)-[:AT {user:u.uid,timestamp:s.timestamp,context:context.uid,statement:s.uid}]->(context)  )  
WITH u, s 
UNWIND $conceptsRelations as conceptsRelation MATCH (c_from:Concept{name: conceptsRelation.from}) MATCH (c_to:Concept{name: conceptsRelation.to}) 
CREATE (c_from)-[:TO {context:conceptsRelation.context,statement:conceptsRelation.statement,user:u.uid,timestamp:conceptsRelation.timestamp, uid:apoc.create.uuid(), gapscan:conceptsRelation.gapscan, weight: conceptsRelation.weight}]->(c_to)  
RETURN DISTINCT s.uid

但是当我运行它时，我收到此错误：

Neo.ClientError.Statement.TypeError
Property values can only be of primitive types or arrays thereof

有人知道为什么会出现吗？我的params似乎设置正确，我没有看到它们不能以这种方式使用......谢谢！

Answer 1

这个答案适用于像我这样的其他 n00bs，他们试图在不阅读友好手册的情况下将复合数据类型放入属性中，并得到上面的错误。谷歌指向这里，所以我觉得添加这个答案是合适的。

具体来说，我想将[(datetime, event), ...]元组列表存储到关系的属性中。

可能遇到的错误有：

Neo.ClientError.Statement.TypeError: Property values can only be of primitive types or arrays thereof

Neo.ClientError.Statement.TypeError: Neo4j only supports a subset of Cypher types for storage as singleton or array properties. Please refer to section cypher/syntax/values of the manual for more details.

Neo4j 工作人员在这篇论坛帖子中很好地总结了底线：

Neo4j 不允许映射作为属性（基本上不允许子属性），并且虽然允许列表作为属性，但它们不能是映射列表（或就此而言的列表列表）。

基本上我试图绕过数据库的自然功能。似乎有两种解决方法：

1. 按照此处的建议进行操作，并将属性存储为 JSON 字符串等

2. 重新思考设计，并将这些属性建模到图中（即更具体地使用节点）

经过一番重新思考后，我想出了一个更简单的数据模型，不需要关系中的复合属性。尽管选项 1 可能有它的用途，但当我们必须坚持一个设计良好的系统（neo4j 就是）时，这通常表明我们应该改变方向。安德烈斯