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Firebase Cloud Messaging + Cloud Functions
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const functions = require('firebase-functions'); | |
const admin = require('firebase-admin'); | |
admin.initializeApp(); | |
exports.sendLeaderboardMesssage = functions | |
.database | |
.ref('/leaderboard/{position}') | |
.onUpdate((change) => { | |
const oldPlayer = change.before.val(); | |
const newPlayer = change.after.val(); | |
// Exit if change is caused by old player moving up in leaderboard | |
if (newPlayer.score <= oldPlayer.score) { return; } | |
const payload = { | |
notification: { | |
title: `${oldPlayer.handle}, ${newPlayer.handle} just beat your score!`, | |
body: 'Play now to get back on the leaderboard', | |
} | |
}; | |
const databaseRoot = change.before.ref.root; | |
return databaseRoot.child('users/' + oldPlayer.uId).once('value') | |
.then(snapshot => { | |
const fcmToken = snapshot.val().fcmToken; | |
return admin.messaging().sendToDevice(fcmToken, payload); | |
}); | |
}); |
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Thanks for reply @laurenzlong. I have subject wise high scores at user document like this:
users/{userID}
fields (key - value):
history - 120
science - 150
total - 270