Neo4j：迭代关系集合并将属性设置为索引

Question

在（i等）{...}样式的经典中，我想迭代一个有序集合 - 伪代码：

for n,i in nodes
  set node.weight = i + 1
end

可行？

Answer 1

是的，但不是最漂亮的事情：

MATCH ...
WITH COLLECT(something) AS nodes
FOREACH(i IN RANGE(0, LENGTH(nodes)) |
    FOREACH(node IN [nodes[i]] |
        SET node.weight = i + 1
))