onWrite()
exports.sendNotification = functions.database .ref("/messages/{messageId}").onWrite(event => { const dsnap = event.data // a DeltaSnapshot that describes the write if (dsnap.exists() && !dsnap.previous.exists()) { // This is a new message, not a change or a delete. // Send notifications with FCM... } })
onCreate()
onUpdate()
onDelete()
exports.sendNotification = functions.database .ref("/messages/{messageId}").onCreate(event => { // Send notifications with FCM... })
exports.lastUpdate = functions.database .ref("/messages/{messageId}").onWrite(event => { const msg = event.data.val() msg.lastUpdated = new Date().getTime() return event.data.adminRef.set(msg) })
exports.lastUpdate = functions.database .ref("/messages/{messageId}").onUpdate(event => { const msg = event.data.val() const now = new Date().getTime() if (msg.lastUpdated > now - (30*1000)) { return } msg.lastUpdated = now return event.data.adminRef.set(msg) })
