extension

main.dart

enum ItemType { drink, pizza }

class Item {
  String id;
  String name;
  double price;
  ItemType type;
  List<int> image;

  Item({
    this.id,
    this.name,
    this.price,
    this.type,
    this.image,
  });

  Item.fromJson(Map<String, dynamic> json) {
    id = json['id'];
    name = json['name'];
    price = json['price'];
    type = ItemType.fromString(json['type']);
    image = json['image'];
  }
}

extension on ItemType {
  ItemType fromString(String str) {
    if (str.toLowerCase() == "drink") return ItemType.drink;
    if (str.toLowerCase() == "pizza") return ItemType.pizza;
    throw Exception();
  }

  String get asString => this == ItemType.drink ? "drink" : "pizza";
}