Cypher：从路径

Question

我想从节点和关系中提取路径属性。 我可以使用以下查询单独为节点和关系执行此操作。

extract(n IN nodes(path)| n.name)

extract(r IN relationships(path)| r.metric)

是否有办法从列表中的路径元素中提取名称和指标，如下所示 [name1, metric1, name2, metric2, name3]

Answer 1

您可以使用reduce来组合数组：

WITH path,
     extract(n IN nodes(path)| n.name) as names,
     extract(r IN relationships(path)| r.metric) as metrics
RETURN HEAD(names) + 
       REDUCE(acc = [], i in RANGE(1,size(metrics)) | 
              acc  + metrics[i-1] + names[i])