Firebase实时数据库中的云功能

Question

我的目标是要有一个databse触发器，以便当"Players"数据库的节点发生更改时，在名为users的另一个Firebase节点上将有一个对应的set ()函数。

以下是我一直在从事的云功能：

const functions = require('firebase-functions');

// The Firebase Admin SDK to access the Firebase Realtime Database. 
const admin = require('firebase-admin');
admin.initializeApp(functions.config().firebase);

exports.update = functions.database.ref('/Player')
    .onWrite(event=>{
      console.log(event.data);
      var ref = admin.database().ref(`/users/{user.uid}/week1`);
      ref.set(10);
      return;

    });

问题是云函数返回错误：

错误：Firebase.child失败：第一个参数是无效路径：“ / users / {user.uid} / week1”。 路径必须是非空字符串...

有多个用户，如下所示，有没有办法我可以访问每个用户的用户uid并在我的云函数中引用它？：

 users: {
   user uid (generated by push) : {
       deviceToken : "tokenID",
       name : "Display Name"
   },
   anotherUserID : {
       deviceToken : "tokenID",
       name : "Display Name"
   }

Players节点如下：

{
"players" : [
       {"name" : "Yasin 'YB' Amusan", 
        "Team" : "Industry",
        "price": 8000000, 
        "position": "forward", 
        "image":"http://res.cloudinary.com/deji/image/upload/v1489787662/blank_photo_mqvivv.png", 
        "goals": 0, 
        "assists" : 0, 
        "Y" : 0, 
        "R" : 0},
       {"name" : "Hassan 'Hasi' Akinyera",
        "Team" : "Industry", 
        "price": 5000000, 
        "position": "defender",
        "image":"http://res.cloudinary.com/deji/image/upload/v1489787662/blank_photo_mqvivv.png",
        "goals": 0, 
        "assists" : 0,
        "Y" : 0,
        "R" : 0},
       {"name" : "Femi 'Fabio' Awoniyi",
        "Team" : "Industry",
        "price": 9000000,
        "position": "defender",
        "image":"http://res.cloudinary.com/deji/image/upload/v1489787662/blank_photo_mqvivv.png",
        "goals": 0, 
        "assists" : 0, 
        "Y" : 0, 
        "R" : 0},
       {"name" : "Deji 'Dej' Awoniyi",
        "Team" : "Industry",
        "price": 7000000,
        "position": "forward",
        "image":"http://res.cloudinary.com/deji/image/upload/v1489787662/blank_photo_mqvivv.png",
        "goals": 0, 
        "assists" : 0, 
        "Y" : 0, 
        "R" : 0},
       {"name" : "Koye 'K10' Kekere-Ekun",
        "Team" : "Industry",
        "price": 9000000,
        "position":"midfielder",
        "image":"http://res.cloudinary.com/deji/image/upload/v1489787662/blank_photo_mqvivv.png",
        "goals": 0, 
        "assists" : 0, 
        "Y" : 0, 
        "R" : 0},
       {"name" : "Teni 'Teezee' Zacchaeus",
        "Team" : "Industry",
        "price": 6000000, 
        "position":"hybrid",
        "image":"http://res.cloudinary.com/deji/image/upload/v1489787662/blank_photo_mqvivv.png",
        "goals": 0, 
        "assists" : 0, 
        "Y" : 0, 
        "R" : 0},
       {"name" : "Bolaji 'Boj' Odojukan",
        "Team" : "Industry",
        "price": 7000000,
        "position":"forward",
        "image":"http://res.cloudinary.com/deji/image/upload/v1489787662/blank_photo_mqvivv.png",
        "goals": 0, 
        "assists" : 0, 
        "Y" : 0, 
        "R" : 0},
       {"name" : "Ernest",
        "Team" : "Industry",
        "price": 6000000,
        "position":"defender"
}

Answer 1

您的函数有几个问题，我不会为您重写函数，但会指出一些事情。

首先，建议您查看以下文档： https : //firebase.google.com/docs/functions/get-started

1. 您的触发器参考不正确。 您的数据库节点是“玩家”而不是“玩家”
2. 您的var ref也不正确。 您是否要从代码中未包含的变量中插入用户ID？ 在设置值之前，您将需要知道用户的ID。

编辑：我建议将用户uid添加到播放器中？ 然后在执行函数时，您可以通过执行以下操作来访问用户uid：

var player = event.data.val();
var uid = player['useruid'];

很难说出你要做什么。