form_controller.dart

  /// Async function which loads feedback from endpoint URL and returns List.
  Future<List<FeedbackForm>> getFeedbackList() async {
    return await http.get(URL).then((response) {
      var jsonFeedback = convert.jsonDecode(response.body) as List;
      return jsonFeedback.map((json) => FeedbackForm.fromJson(json)).toList();
    });
  }