I'm using Firebase Messaging to send out notifications to users of my iPhone app. My database is structured like this:
- Users
- user1
- user2
- Groups
- group1
- members
- user1
- user2
When a user joins a group they get subscribed to a topic corresponding to that group. I have a cloud function that listens for writes in that group, and sends a notification to the groups topic when a write happens:
exports.sendNotifs = functions.database
.ref('pets/{petId}/events/{eventId}').onWrite(event => {
const pet_Id = event.params.petId;
const payload = {
'notification': {
'title': `${toTitleCase(name)} just logged an event`,
'body': `${events[eventType]} for ${toTitleCase(petName)}`,
'sound': 'default',
}
};
admin.messaging().sendToTopic(pet_Id, payload);
});
However, this results in everybody getting a notification including the person who did the write that triggered the notification. I only want other people in the group to display a notification since the triggering user doesn't need to see one. I tried appending the sending user's uid as extra data of the notification and only displaying the notification if the recieving user's uid doesn't match the notification data's uid. This works when the application is in the foreground but not if its in the background, so if the user writes then closes the application before he receives the notification it'll display for him when he receives it, something I'm trying to avoid.
How can I make sure only other members of a group get a notification? Are messaging topics not good for this?
