CodableArrayOfMultipleObjects-OrderItem.swift

enum OrderItem: Decodable, Equatable {
    case food(FoodDelivery)
    case package(PackageDelivery)
    case passenger(PassengerDelivery)
    
    enum CodingKeys: CodingKey, CaseIterable {
        case food
        case package
        case passenger
    }
    
    init(from decoder: Decoder) throws {
        let container = try decoder.container(keyedBy: CodingKeys.self)
        if let value = try container.decodeIfPresent(FoodDelivery.self, forKey: .food) {
            self = OrderItem.food(value)
            return
        }
        
        if let value = try container.decodeIfPresent(PackageDelivery.self, forKey: .package) {
            self = OrderItem.package(value)
            return
        }
        
        if let value = try container.decodeIfPresent(PassengerDelivery.self, forKey: .passenger) {
            self = OrderItem.passenger(value)
            return
        }
        
        throw DecodingError.valueNotFound(Self.self, DecodingError.Context(codingPath: CodingKeys.allCases, debugDescription: "food/package/passenger not found"))
    }
}