class Collection {
  Collection({required this.name, int? createdAt})
    : createdAt = createdAt ?? DateTime.now().millisecondsSinceEpoch;

  factory Collection.fromJson(Map<String, dynamic> json) => Collection(
    name: json['name'] as String,
    createdAt: json['createdAt'] as int,
  );

  String name;
  int createdAt; // used as Id with millisecondsSinceEpoch

  int get id => createdAt;

  DateTime get createdDate => DateTime.fromMillisecondsSinceEpoch(createdAt);

  Map<String, dynamic> toJson() => {'name': name, 'createdAt': createdAt};
}