Android Firebase将数据保存到实时数据库 [英] android firebase saving data to realtime database

问题描述

在android应用中，我创建了一个通过电话号码进行身份验证的Firebase用户，它可以正常工作，然后我通过添加显示名称来更新此用户，这也很好；最后，我想将用户数据保存到Firebase数据库中，所以我编写了以下规则:

In android app I create a firebase user authenticated by phone number and it works fine then I update this user adding display name and this is fine too; in the end I want to save user's data into firebase database so I wrote this rule:

"users" : {
  "$user_id" : {   // firebase user uid
    ".read"  : "$user_id === auth.uid",
    ".write" : "$user_id === auth.uid",

    ".validate": "newData.hasChildren(['enabled', 'group', 'name'])",

    "enabled" : { ".validate" : "newData.isBoolean()" },
    "group"   : { ".validate" : "newData.isString()" },
    "name"    : { ".validate" : "newData.isString()" },
  }
}

这不起作用，尽管模拟器显示一切正常(在模拟中，我使用自定义身份验证并将Firebase设置为用户的uid提供程序)，但我仍然返回拒绝权限".

This doesn't work and I get returned "permission denied" altough the simulator shows everything is fine (in the simulation I use custom authentication and set firebase as provider with the user's uid).

用户的类别是:

public class User {
    public boolean enabled;
    public String group;
    public String name;

    public User() { }

    public User(boolean enabled, String group, String name) {
        this.enabled = enabled;
        this.group = group;
        this.name = name;
    }
}

我尝试通过以下方式保存它:

and i try to save it by:

private void saveUserToDB() {
    User newUser = new User(true, "operators", currentUser.getDisplayName());
    mRootRef.child("users").child(currentUser.getUid()).setValue(newUser, new DatabaseReference.CompletionListener() {
        @Override
        public void onComplete(DatabaseError databaseError, DatabaseReference databaseReference) {
            if (databaseError != null) {
                Log.e("ERROR", "Data could not be saved " + databaseError.getMessage());
            } else {
                Log.e("SUCCESS", "Data saved successfully.");
            }
        }
    });
}

有人可以帮助我理解为什么会这样吗?谢谢

Can anybody kindly help me to understand why this happens? Thanks

更新下面是数据库的模式":

UPDATE below is a "schema" of how the database should be:

{
    "messages" : {
        "1763409620982" : { // timestamp
            "position" : "position text",
            "sender"   : "sender name",
            "text"     : "message text"
        },
        "1763409734527" : { // timestamp
            "position" : "position text",
            "sender"   : "sender name",
            "text"     : "message text"
        }

        ...
    },

    "users" : {
        "Yi79w0HgA4ZTNAMHadixzoO5PaR2" : { // firebase user uid
            "enabled" : true,
            "group"   : "group 1",
            "name"    : "user display name"
        },
        "kX22c0GgL4ZTNAMHallfgoO4pBN1" : { // firebase user uid
            "enabled" : true,
            "group"   : "group 2",
            "name"    : "user name"
        }

        ...
    }
}

这是完整的规则集:

{
    "rules": {

        "messages" : {
            ".read"    : "root.child('users').child(auth.uid).child('group').val() === 'group 1'",
            ".write"   : "root.child('users').child(auth.uid).child('group').val() === 'group 2'",

            "$tstamp" :{

                ".validate": "newData.hasChildren(['position', 'sender', 'text'])",

                "position"  : { ".validate" : "newData.isString()" },
                "sender"    : { ".validate" : "newData.isString()" },
                "text"      : { ".validate" : "newData.isString()" },
            } 
        },

        "users" : {
            "$user_id" : {
                ".read"  : "$user_id === auth.uid",
                ".write" : "$user_id === auth.uid",

                ".validate": "newData.hasChildren(['enabled', 'group', 'name'])",

                "enabled" : { ".validate" : "newData.isBoolean()" },
                "group"   : { ".validate" : "newData.isString()" },
                "name"    : { ".validate" : "newData.isString()" },
            }
        }
    }
}

关于类 user 的定义如上，仅用于方法 saveUserToDB

as to the class user it's defined as above and only used into the method saveUserToDB

推荐答案

尝试在setValue()之前添加push():它将添加新的子节点，其中包含User类对象的所有字段:

Try to add push() before setValue(): It will add new sub-node containing all the fields from object of User class:

mRootRef.child("users").child(currentUser.getUid()).push().setValue(and so on...

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