JSON 모델을 디코딩할 때 간편하게 해주는 매크로 // 전 struct Model: Codable { let userInformation: UserInfo let totalUsers: Int enum CodingKeys: String, CodingKey { case userInformation = "user_information" case totalUsers = "total_users" } } struct UserInfo: Codable { let isAdmin: Bool let postCount: Int let isBanned: Bool enum CodingKeys: String, CodingKey { case isAdmin = "is_admin" case postCount = "post_count" case isBanned = "is_banned" } } // 매크로 사용 후 @DTO struct Model { @Property(key: "user_information") let userInfo: UserInfo @Property(key: "total_users") let totalUsers: Int } @DTO struct UserInfo { @Property(key: "is_admin") let isAdmin: Bool @Property(key: "post_count") let postCount: Int @Property(key: "is_banned") let isBanned: Bool }