Comment Model (Lazy Decoding)

CommentModel2.swift

class Comment: Decodable {
    let id: String
    let text: String
    let frame: Int
    let annotation: String?

    private(set) lazy var drawings: [Drawing]? = {
        guard let annotationData = annotation?.data(using: .utf8) else { return nil }
        return try? JSONDecoder().decode([Drawing].self, from: annotationData)
    }()

    init(id: String, text: String, frame: Int, annotation: String?) {
        self.id = id
        self.text = text
        self.frame = frame
        self.annotation = annotation
    }
}