What are the contents of RemoteMessage of Firebase? - firebase

Question

https://blog.logrocket.com/flutter-push-notifications-with-firebase-cloud-messaging/
// For handling the received notifications
FirebaseMessaging.onMessage.listen((RemoteMessage message) {
// Parse the message received
PushNotification notification = PushNotification(
title: message.notification?.title,
body: message.notification?.body,
);
As we can see, notification is one field in RemoteMessage structure.
and here: https://pub.dev/packages/firebase_messaging/example
Future<void> _firebaseMessagingBackgroundHandler(RemoteMessage message) async {
// If you're going to use other Firebase services in the background, such as Firestore,
// make sure you call `initializeApp` before using other Firebase services.
await Firebase.initializeApp();
print('Handling a background message ${message.messageId}');
}
messageId is another field in RemoteMessage.
What other fields are in this RemoteMessage structure? I tried to find its API but failed.
Can we override it and fill our own fields?

Answer 1

Here is the structure of RemoteMessage. You can add your custom data to the data property of it.
const RemoteMessage(
{this.senderId,
this.category,
this.collapseKey,
this.contentAvailable = false,
this.data = const <String, dynamic>{},
this.from,
this.messageId,
this.messageType,
this.mutableContent = false,
this.notification,
this.sentTime,
this.threadId,
this.ttl});
A usual notification payload when send from the backend/cloud functions looks like this:
const payload = {
notification: {
title: title,
body: message,
},
data: {
uid,
},
webpush: {
notification: {
icon: photoURL,
},
},
android: {
notification: {
image: photoURL,
},
},
apns: {
payload: {
aps: {
"mutable-content": 1,
},
},
fcm_options: {
image: photoURL,
},
},
};