class Player {
  final String name;
  final Set<String> positions;

  Player({required this.name, required this.positions});

  Map<String, dynamic> toMap() => {
        'name': name,
        'positions': positions.toList(),
      };

  factory Player.fromMap(Map<String, dynamic> map) => Player(
        name: (map['name'] ?? '').toString(),
        positions: Set<String>.from(map['positions'] ?? const []),
      );
}