如何设置&“.indexOn&"Firebase中的所有子键? [英] How can I set ".indexOn" for all child keys in Firebase?

问题描述

我在Firebase实时数据库中具有以下数据结构.

I have the follow data structure in Firebase Realtime Database.

{
   groups: {
      $groupid: {
        $userid: Boolean
      }
   }
}

此处 #groupid 和 $ userid 不同.
当ID为"user0"的用户位于组"group0"中时，它将为

Here #groupid and $userid vary.
When a user with id "user0" is in the group "group0", it will be

{
   groups: {
    ...
    group0: {
       user0: true
    }
    ...
   }
}

删除用户后，将为 user0:false .当我向特定用户查询组时， Firebase SDK 显示警告: FIREBASE警告:使用未指定的索引.考虑将/groups的".indexOn":"user0"添加到安全规则中，以获得更好的性能

When the user is removed, it will be user0: false. When I query groups with a specific user, Firebase SDK shows a warning: FIREBASE WARNING: Using an unspecified index. Consider adding ".indexOn": "user0" at /groups to your security rules for better performance

随着用户ID的变化，我认为所有用户ID都应编入索引.
如何编写相关的安全规则?

As the user id varies, I think all user ids should be indexed on.
How can I write a relevant security rule?

推荐答案

如果要与特定用户一起查询组，最好让用户维护组列表.

If you want to query groups with a specific user, it is better to make a user maintain group list.

{
    user-groups: {
        user0: {
            group0: true,
            group1: true
        }
    }
}

因此，组具有其成员，而用户具有他/她所属的组.

So, a group has its members and a user has groups he/she belongs to.

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