Getting error while deploying node.js cloud function

Question

I am implementation notifications of firebase in my app. This is my node.js function

'use strict'

const functions = require('firebase-functions');
const admin=require('firebase-admin');
admin.initializeApp(functions.config().firebase);

exports.sendNotificaiton=functions.database.ref('/Notifications/{userKey}/{notification_id}').
onWrite(event => {
const userKey = event.params.userKey;
const notification = event.params.notification;

console.log('The userKey is ', userKey);

});

My firebase db structure is

Error in Functions is

Please help me . Thanks in advance

Answer 1

Change your code

From this

exports.sendNotificaiton=functions.database.ref('/Notifications/{userKey}/{notification_id}').
onWrite(event => {
const userKey = event.params.userKey;
const notification = event.params.notification;

console.log('The userKey is ', userKey);

});

To this

exports.sendNotificaiton=functions.database.ref('/Notifications/{userKey}/{notification_id}').onWrite((change, context) => {

const userKey = context.params.userKey;
const notification = context.params.notification;

console.log('The userKey is ', userKey);

});

You are using the old event trigger for onWrite(), now you need to pass context and your dataSnapshot (change).

Also onWrite has before and after values when a write event triggers your database

check the docs here : https://firebase.google.com/docs/functions/database-events?hl=en

See the notification example on github for notifications: https://github.com/firebase/functions-samples/tree/Node-8/fcm-notifications