So basically, I have a function that sends a user an email when a room Status becomes "Available"

exports.sendAvailableRoomEmail = functions.firestore.document('rooms/{roomId}/Status').onUpdate(async (snap, context) => {
    const newVal = snap.after.data();

    const oldVal = snap.before.data();

    if(newVal == "Available"){
        // send email
    }
})

what I need passed into the function is the specific room that the user wants a notification from: {roomId}

How can I pass that specific room only when the user clicks the notify me button right next to it?

CodePudding user response：

The triggers for a Cloud Function needs to be known when you deploy that function. That means you can either trigger for all rooms, or you can trigger for a specific room, but you can't trigger for rooms that meet a dynamic condition such as yours.

The common way to implement the use-case is to query Firestore inside the Cloud Functions code to find if any user need to be notified for the specific room that was updated.