Neo4j Cypher检查节点是否为子节点的祖先

Question

I have a following class:

@NodeEntity
public class Product {

    private final static String CONTAINS = "CONTAINS";

    @GraphId
    private Long id;

    @RelatedTo(type = CONTAINS, direction = Direction.INCOMING)
    private Set<Product> parentProducts = new HashSet<>();

}

I'm trying to implement a method:

public boolean isProductAncestor(Product productId, Product childProductId) {
    //some Cypher query
}

that will check if productId is an ancestor(any depth up to the root) of childProductId .

I need a Cypher query for it.

Answer 1

This query finds the path between them:

MATCH path=(p:Product)-[:CONTAINS*]->(m:Product)
WHERE id(p) = {idp} AND id(m) = {idm}
RETURN path LIMIT 1;

If you get a result, that means that m is an ancestor of p . If you get nothing, there's no relationship between them.