flutter_tracker/lib/model/entity_factory.dart

import 'package:flutter_tracker/model/submit_model.dart';
import 'package:flutter_tracker/model/user_model.dart';

class EntityFactory {
  static T geneerateObj<T>(dynamic json) {
    switch (T.toString()) {
      case "UserModel":
        return UserModel.fromJson(json) as T;
        break;
      case "SubmitModel":
        return SubmitModel.fromJson(json) as T;
        break;
      default:
        return null;
    }
  }
}