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[英]Checking with Cloud Function if a database node exists in Firebase Realtime Database
[英]Cloud Function in Firebase Realtime Database
我的目標是要有一個databse觸發器,以便當"Players"
數據庫的節點發生更改時,在名為users
的另一個Firebase節點上將有一個對應的set ()
函數。
以下是我一直在從事的雲功能:
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;
});
問題是雲函數返回錯誤:
錯誤:Firebase.child失敗:第一個參數是無效路徑:“ / users / {user.uid} / week1”。 路徑必須是非空字符串...
有多個用戶,如下所示,有沒有辦法我可以訪問每個用戶的用戶uid並在我的雲函數中引用它?:
users: {
user uid (generated by push) : {
deviceToken : "tokenID",
name : "Display Name"
},
anotherUserID : {
deviceToken : "tokenID",
name : "Display Name"
}
Players節點如下:
{
"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"
}
您的函數有幾個問題,我不會為您重寫函數,但會指出一些事情。
首先,建議您查看以下文檔: https : //firebase.google.com/docs/functions/get-started
ref
也不正確。 您是否要從代碼中未包含的變量中插入用戶ID? 在設置值之前,您將需要知道用戶的ID。 編輯:我建議將用戶uid添加到播放器中? 然后在執行函數時,您可以通過執行以下操作來訪問用戶uid:
var player = event.data.val();
var uid = player['useruid'];
很難說出你要做什么。
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