【Flutter】Entityクラスをfreezedで実装した

class Task {
  int? id;
  String title;
  String? description;
  bool isComplete;
  int point;
  TaskType taskType;
  DateTime? atComplete;

  Task({
    this.id,
    required this.title,
    this.description,
    required this.isComplete,
    required this.point,
    required this.taskType,
    this.atComplete,
  });

  Map<String, dynamic> toMap() {
    return {
      'id': id,
      'title': title,
      'description': description,
      'isComplete': isComplete ? 1 : 0,
      'point': point,
      'taskType': taskType.index,
      'atComplete': atComplete?.toIso8601String(),
    };
  }

  factory Task.fromMap(Map<String, dynamic> map) {
    return Task(
      id: map['id'] as int?,
      title: map['title'] as String,
      description: map['description'] as String?,
      isComplete: map['isComplete'] == 1,
      point: map['point'] as int,
      taskType: TaskType.values[map['taskType'] as int],
      atComplete: map['atComplete'] == null
          ? null
          : DateTime.parse(map['atComplete'] as String),
    );
  }
}

part "task.freezed.dart";
part "task.g.dart";

@freezed
class Task with _$Task {
  const factory Task({
    int? id,
    required String title,
    String? description,
    @BoolIntConverter() @Default(false) bool isComplete,
    required int point,
    @TaskTypeConverter() required TaskType taskType,
    DateTime? atComplete,
  }) = _Task;

  factory Task.fromJson(Map<String, dynamic> json) => _$TaskFromJson(json);
}

class TaskTypeConverter implements JsonConverter<TaskType, int> {
  const TaskTypeConverter();

  @override
  TaskType fromJson(int json) {
    return TaskType.values[json];
  }

  @override
  int toJson(TaskType object) {
    return object.index;
  }
}

class BoolIntConverter implements JsonConverter<bool, int> {
  const BoolIntConverter();

  @override
  bool fromJson(int json) {
    return json == 1;
  }

  @override
  int toJson(bool object) {
    return object ? 1 : 0;
  }
}