不再支持Neo4j过滤器功能 [英] Neo4j Filter function is no longer supported

问题描述

我想比较两个列表，以便在第一个列表中找到不在第二个列表中的值并返回它们。预先感谢大家
代码返回：不再支持过滤器
还有其他替代方法

I want to compare two lists in order to find the values in the first list which are not in the second and return them. thanks in advance guys the code returns: Filter is no longer supported is there any alternative way to do this

MATCH (cu:Customer{name: "myCustomer"})-[pu:PURCHASED]->(o:Order)-[*]->(cat:Category)
MATCH (b:Book)-[:IS_a]->(cat)
WITH COLLECT(DISTINCT pu.ISBN) AS purchasedbooks,COLLECT(DISTINCT b.ISBN) AS booksFromTheSameCategory
RETURN FILTER( n IN booksFromTheSameCategory WHERE NOT n IN purchasedbooks ) as listC

推荐答案

您可以使用列表理解语法，而不是过时的 filter 函数：

You can use the list comprehension syntax instead of the obsolete filter function:

MATCH (cu:Customer{name: "myCustomer"})-[pu:PURCHASED]->(o:Order)-[*]->(cat:Category)<-[:IS_a]-(b:Book)
WITH COLLECT(DISTINCT pu.ISBN) AS purchasedbooks, COLLECT(DISTINCT b.ISBN) AS booksFromTheSameCategory
RETURN [n IN booksFromTheSameCategory WHERE NOT n IN purchasedbooks] as listC

您可以在此页面。

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