Custom Encoding Code

CustomEncoder.swift

struct BattleShip {
    var name: String
    var created: String
    var movieName: String
    var director: String

    enum CodingKeys: String, CodingKey {
        case name
        case created
        case film
    }

    enum FilmInfoKeys: String, CodingKey {
        case name
        case director
    }
}


extension BattleShip: Encodable, Decodable {
    init(from decoder: Decoder) throws {
        let values = try decoder.container(keyedBy: CodingKeys.self)
        name = try values.decodeIfPresent(String.self, forKey: .name) ?? ""
        created = try values.decodeIfPresent(String.self, forKey: .created) ?? ""

        let filmInfo = try values.nestedContainer(keyedBy: FilmInfoKeys.self, forKey: .film)

        movieName = try filmInfo.decodeIfPresent(String.self, forKey: .name) ?? ""
        director = try filmInfo.decodeIfPresent(String.self, forKey: .director) ?? ""
    }

    func encode(to encoder: Encoder) throws {
        var container = encoder.container(keyedBy: CodingKeys.self)
        try container.encode(name, forKey: .name)
        try container.encode(created, forKey: .created)

        var filmInfo = container.nestedContainer(keyedBy: FilmInfoKeys.self, forKey: .film)
        try filmInfo.encode(movieName, forKey: .name)
        try filmInfo.encode(director, forKey: .director)
    }
}