条件属性嵌套时如何查询Firebase数据库对象? [英] How to query Firebase database object when criteria property is nested?

问题描述

我在Firebase数据库中具有以下结构:

I have the following structure in Firebase database:

root
 - Users
 - Posts
   - -K_54s1smPPh6qN4znuT
     - key1: val
     - key2: val
     - User:
       - -K_54sSomeKeyFromUsersObject: "John Doe"
...

但是我在文档中找不到任何示例，当我具有这样的结构时，如何通过UserKey获取所有Posts.

But I can't find any example in documentation how can I fetch all Posts by UserKey when I have structure like this.

我需要有关如何进行查询以比较像这样的嵌套数据的帮助吗?

I need help on how to make a query to compare nested data like this?

推荐答案

一种解决方法是将对帖子的引用保存到用户上.像这样:

One way to approach this is to save the reference to the posts on the user. Like this:

root
 - Users
   - [UserID]
      - UserPosts
        -K_54s1smPPh6qN4znuT
 - Posts
   - -K_54s1smPPh6qN4znuT
     - key1: val
     - key2: val
     - User:
       - -K_54sSomeKeyFromUsersObject: "John Doe"
...

因此，当您要按用户检索所有帖子时，只需查看用户个人资料上的引用

So when you want to retrieve all posts by an user, you just look at the references on the user profile

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