The operator '[]' isn't defined for the type 'Object'. Flutter Dart

Question

Hello, could you help me with this error, I don't know how to solve it

import 'package:firebase_database/firebase_database.dart';

class Users {
  String id;
  String email;
  String name;
  String phone;

  Users({
    this.id,
    this.email,
    this.name,
    this.phone,
  });

  Users.fromSnapshot(DataSnapshot dataSnapshot) {
    id = dataSnapshot.key;
    email = dataSnapshot.value["email"];
    name = dataSnapshot.value["name"];
    phone = dataSnapshot.value["phone"];
  }
}

Answer 1

Try this

Users.fromSnapShot(DataSnapshot dataSnapshot) {
    var data = dataSnapshot.value as Map?;
    id = dataSnapshot.key;
    email = data?["email"];
    name = data?["name"];
    phone = data?["phone"];
    print("Users email $email");
    print("Users name $name");
    print("Users phone $phone");
  }

Answer 2

From the documentation, DataSnapshot.value is a type Object?. This type doesn't define an indexer like List or Map does, so you can't use an indexer on it.

However, since Object is the superclass of everything, value could be typed as Object but actually be a Map. You can try to cast it to a Map first if you like, but you should only do this if you know that it is a Map. If it's not, then casting it will result in a runtime error. (You can do print(dataSnapshot.value.runtimeType) and see what it says before you make your decision.)