class TodoItem { final String id; final String familyMemberId; final String title; final bool completed; final DateTime? dueDate; const TodoItem({ required this.id, required this.familyMemberId, required this.title, required this.completed, required this.dueDate, }); factory TodoItem.fromJson(Map json) { return TodoItem( id: json["_id"] as String? ?? "", familyMemberId: json["familyMemberId"] as String? ?? "", title: json["title"] as String? ?? "", completed: json["completed"] as bool? ?? false, dueDate: json["dueDate"] != null ? DateTime.tryParse(json["dueDate"] as String) : null, ); } Map toJson() { return { "familyMemberId": familyMemberId, "title": title, "completed": completed, "dueDate": dueDate?.toIso8601String(), }; } }