How to use apns-collapse-id with FCM? - ios

Question

I know this question have been asked many times but none of the answers work for me. Some of the questions dont even have an answer.
I am try to bundle or group similar notifications on ios. I am using FCM Cloud Functions to trigger notifications.
Following are the methods i tried by
const payload = {
notification: {
title: "Your medical history is updated" + Math.random(),
tag: "MedicalHistory",
},
data: {
click_action: "FLUTTER_NOTIFICATION_CLICK",
sound: "default",
status: "done",
},
};
const patchedPayload = Object.assign({}, payload, {
apns: {
headers: {
"apns-collapse-id": "MedicalHistory",
},
},
});
const options = {
priority: "high",
collapseKey: "MedicalHistory",
};
await admin
.messaging()
.sendToDevice("MY_TOKEN", patchedPayload, options);
The above code does not work
const payload = {
notification: {
title: "Your medical history is updated" + Math.random(),
tag: "MedicalHistory",
},
data: {
click_action: "FLUTTER_NOTIFICATION_CLICK",
sound: "default",
status: "done",
},
apns: {
headers: {
"apns-collapse-id": "MedicalHistory",
},
},
};
const options = {
priority: "high",
collapseKey: "MedicalHistory",
};
await admin
.messaging()
.sendToDevice("MY_TOKEN", payload, options);
This does not work as well.
I dont understand where to put the apns-collapse-id. The cloud functions sample also does not show this. Neither i could find doc with code on this

Answer 1

I recommend using the latest send function from the firebase-admin lib, usage described here.
It seems to work fine and somewhat easier to apply.
An example of a message with android/ios specific headers:
// common data for both platforms
const notification = {
title: 'You liked!',
body: 'You really liked something...',
}
const fcmToken = '...'
// android specific headers
const android = {
collapseKey: '0'
}
// ios specific headers
const apns = {
headers: {
"apns-collapse-id": '0'
}
}
// final message
const message = {
token: fcmToken,
notification: notification,
android: android,
apns: apns,
}
// send message
admin.messaging().send(message).catch(err => console.error(err));