Why is my data being removed when i update a certain field in a realtime database in flutter for web

Question

I am trying to update my data in the real-time database in flutter for a web app. But whenever I update my data, it deletes all of the other fields in the same table.

ChangeNotificationStatus() async {
    Map NotificationData = {
      "NotificationChecked": "YES",
    };
    await put(
        Uri.parse(
            "https://officialnasproject-default-rtdb.firebaseio.com/App/Notification.json"),
        body: jsonEncode(NotificationData));
  }

Answer 1

Whenever you put data to a path in the database, the data you provide in the request replaces all existing data in that path.

If you want to only update a single property, you can two options:

• You can put that single value to the lower level path:

  await put(
    Uri.parse(
      "https://officialnasproject-default-rtdb.firebaseio.com/App/Notification/NotificationChecked.json"),
    body: jsonEncode("YES"));
  }
  

• You can use patch, which replaces only the keys you have in your NotificationData map and leaves other keys unmodified.

For more on these operations, I recommend reading the Firebase documentation on the REST API of the Realtime Database.