CODEWITHSUNDEEP
node.jsfirebasefirebase-realtime-databasefirebase-cloud-messaginggoogle-cloud-functions
Norbert
Norbert

Reputation: 3

Realtime database function triggers constantly

I have deployed a JS function for Firebase realtime database triggers. In its operations, it should send a push notification just on value update in the database, which is dead simple:

{
 "rollo" : "yes"
}

If value changes to yes it should trigger notification. If it goes to "no" then it should do nothing. Here is the JS function:

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

exports.sendNewPostNotif = functions.database.ref('/rollo').onUpdate((change, context) => {

  console.log('Push notification event triggered');
  const beforeData = change.before.val();

      const payload = {
        notification: {
            title: 'Push triggered!',
            body: "Push text",
            sound: "default"
        }
    };

      const options = {
        priority: "high",
        timeToLive: 60 * 10 * 1
    };

  return admin.messaging().sendToTopic("notifications", payload, options);
});

Also even though I have set TTL, each value change sends another push notification.

Any ideas?

Upvotes: 0

Views: 575

Answers (2)

Sidah Merzouk
Sidah Merzouk

Reputation: 594

I would try something like this:

exports.sendNewPostNotif = functions.database.ref('/rollo').onWrite((change, context) => {

  const newData = change.after.val();
  const oldData = change.before.val();

      const payload = {
        notification: {
            title: 'Push triggered!',
            body: "Push text",
            sound: "default"
        }
    };

      const options = {
        priority: "high",
        timeToLive: 60 * 10 * 1
    };
  if (newData != oldData && newData == 'yes') {
    return admin.messaging().sendToTopic("notifications", payload, options);
  }
});

Upvotes: 2

Peter Haddad
Peter Haddad

Reputation: 80914

onUpdate():

triggers when data is updated in the Realtime Database.

When you update it to "no" it will send a notification and when you update it to "yes" it will also send a notification.

https://firebase.google.com/docs/functions/database-events

Upvotes: 1

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