Mobile_Health/fast_med_app/lib/res/event_firestore_service.dart

import 'package:firebase_helpers/firebase_helpers.dart';
import '../model/event.dart';

DatabaseService<EventModel> eventDBS = DatabaseService<EventModel>
  ("events",fromDS: (id,data) => EventModel.fromDS(id, data), toMap:
    (event) => event.toMap());