Question

删除节点后，我有一个问题是在结果中获取节点记录。

我的查询是：

MATCH (user:User)-[:CREATED]->(comment:Comment)-[:BELONGS_TO]->(post:Post)
WHERE comment.uuid = {commentUUID} AND post.uuid = {postUUID} AND user.uuid = {userUUID} AND NOT EXISTS(user.deleted)
DETACH DELETE comment
RETURN comment

这里我删除属于某个帖子的评论（BELONGS_TO）。我还检查想要删除评论的用户是否也是此评论的作者（已创建）。

查询有效，删除节点和关系成功，但我对返回值不满意。

它显示了我的结果：

{ metadata: { deleted: true, id: 89 },
  paged_traverse: 'http://myDatabaseURI/db/data/node/89/paged/traverse/{returnType}{?pageSize,leaseTime}',
  outgoing_relationships: 'http://myDatabaseURI/db/data/node/89/relationships/out',
  outgoing_typed_relationships: 'http://myDatabaseURI/db/data/node/89/relationships/out/{-list|&|types}',
  labels: 'http://myDatabaseURI/db/data/node/89/labels',
  create_relationship: 'http://myDatabaseURI/db/data/node/89/relationships',
  traverse: 'http://myDatabaseURI/db/data/node/89/traverse/{returnType}',
  all_relationships: 'http://myDatabaseURI/db/data/node/89/relationships/all',
  all_typed_relationships: 'http://myDatabaseURI/db/data/node/89/relationships/all/{-list|&|types}',
  property: 'http://myDatabaseURI/db/data/node/89/properties/{key}',
  self: 'http://myDatabaseURI/db/data/node/89',
  incoming_relationships: 'http://myDatabaseURI/db/data/node/89/relationships/in',
  properties: 'http://myDatabaseURI/db/data/node/89/properties',
  incoming_typed_relationships: 'http://myDatabaseURI/db/data/node/89/relationships/in/{-list|&|types}' }

感谢您的帮助！

编辑：

我将db URI隐藏在结果中，并将其替换为myDatabaseURI

Answer 1

据我所知，当您删除节点时，您无法通过返回节点本身来返回其属性。

但是，您可以在删除之前获取节点的属性，并在删除节点本身后返回该节点：

MATCH (user:User)-[:CREATED]->(comment:Comment)-[:BELONGS_TO]->(post:Post)
WHERE comment.uuid = {commentUUID} AND post.uuid = {postUUID} AND user.uuid = {userUUID} AND NOT EXISTS(user.deleted)
WITH comment, properties(comment) as props
DETACH DELETE comment
RETURN props

但是，如果你需要返回它，你可以使用map projection来获取所有属性和节点id。

在DETACH DELETE之后返回已删除的节点

1 个答案: