Question

我正在撰写查询以获取您朋友的所有帖子，每篇帖子的评论以及每条评论的回复：

MATCH (:User {email:{my_email}})-[:Friends]->(other_user:User)-[:Published]->(post:Post)
    OPTIONAL MATCH (commenters:User)-[:Published]->(comments:Comment)-[:Comments]->post
    OPTIONAL MATCH (repliers:User)-[:Published]->(reply:Reply)-[:Replied]->comments
    WITH post, other_user, comments, reply
    ORDER BY comments.timestamp DESC, reply.timestamp DESC
    RETURN post AS posts, other_user AS other, Collect(comments) AS comments, Collect(reply) as replies
    ORDER BY post.timestamp DESC LIMIT 20

我可以收到帖子的所有帖子和评论，但无法收到评论的回复。

我们如何执行这样的查询？

Answer 1

我想出了如何查询

这是正确的查询：

  MATCH (:User {email:{my_email}})-[:Friends]->(User)-[:Published]->(post:Post)
  OPTIONAL MATCH (commenters:User)-[:Published]->(comment:Comment)-[:Commented]->post
  OPTIONAL MATCH (repliers:User)-[:Published]->(reply:Reply)-[:Replied]->comment
  WITH post, comment, reply
  ORDER BY reply.timestamp ASC
  WITH post, comment, Collect(reply) as replies
  ORDER BY comment.timestamp ASC
  WITH post, Collect({comment: comment, replies: replies}) as comments
  ORDER BY post.timestamp DESC
  RETURN Collect({post:post, comments:comments}) as posts

查询说明：

我们收到所有朋友的帖子
某些Post可能还没有评论，因此我们在OPTIONAL MATCH上使用Comment
某些Comment可能没有回复，因此我们在OPTIONAL MATCH上也使用了Reply
ORDER BY ASC订单中的回复..从最旧到最新
Collect所有回复
然后ORDER BY ASC中的评论也是从最旧到最新的
然后Collect每个人Comment及其相关回复
ORDER BY DESC订单中的帖子..从最新到最旧
然后Collect每个人Post及其相关评论

获取嵌套查询中帖子的评论回复

1 个答案: