/// 分类（type: 1=支出，2=收入）
class Category {
  final int id;
  final String name;
  final String icon; // emoji
  final int type;
  final int? sortOrder;

  const Category({
    required this.id,
    required this.name,
    required this.icon,
    required this.type,
    this.sortOrder,
  });

  factory Category.fromJson(Map<String, dynamic> json) => Category(
        id: (json['id'] as num?)?.toInt() ?? 0,
        name: json['name']?.toString() ?? '',
        icon: json['icon']?.toString() ?? 'other',
        type: (json['type'] as num?)?.toInt() ?? 1,
        sortOrder: (json['sortOrder'] as num?)?.toInt(),
      );
}