Javascript Firebase从已删除的数据中删除孤立数据
假设我有两个这样的数据: 帖子 "posts": { "postid_xx1": { "title": "Lorem ipsum" }, "postid_xx2": { "title": "Amet laboris" }, "postid_xx3": { "title": "Sit quis incididunt" } } "users": { "userid_xx1": { "name": "John Doe", "posts": { "postid_xx1": true, "postid_xx3": true } }, "userid_xx1": { "name": "Jane Doe, "posts": { "postid_xx2": true } } } “员额”:{ “postid_xx1”:{ “标题”:“Lorem ipsum” }, “postid_xx2”:{ “标题”:“Amet laboris” }, “postid_xx3”:{ “标题”:“参加比赛” } } 用户 "posts": { "postid_xx1": { "title": "Lorem ipsum" }, "postid_xx2": { "title": "Amet laboris" }, "postid_xx3": { "title": "Sit quis incididunt" } } "users": { "userid_xx1": { "name": "John Doe", "posts": { "postid_xx1": true, "postid_xx3": true } }, "userid_xx1": { "name": "Jane Doe, "posts": { "postid_xx2": true } } } “用户”:{ “用户ID_xx1”:{ “姓名”:“约翰·多伊”, “员额”:{ “postid_xx1”:正确, “postid_xx3”:正确 } }, “用户ID_xx1”:{ “姓名”:“简·多伊, “员额”:{ “postid_xx2”:正确 } } }Javascript Firebase从已删除的数据中删除孤立数据,javascript,firebase,firebase-realtime-database,Javascript,Firebase,Firebase Realtime Database,假设我有两个这样的数据: 帖子 "posts": { "postid_xx1": { "title": "Lorem ipsum" }, "postid_xx2": { "title": "Amet laboris" }, "postid_xx3": { "title": "Sit quis incididunt" } } "users": { "userid_xx1": {
如何从
用户
中删除postid\u xx1
,当我从posts
中删除它时?。Firebase实时数据库没有自动数据删除功能。您必须自己编写代码来完成此操作。因为数据库是“NoSQL”“,它不会管理您放入其中的数据的关系。你必须自己管理这些关系
您可以通过两次调用remove()在客户机上编写它:
或者,您可以使用云函数编写一个触发器,当从帖子
中删除节点时,该触发器会自动搜索并删除用户
下的匹配节点