swift_multi_key_decoding

multi_key_decoding.md

struct Person: Decodable {
    var name: String

    // 멀티 키에 대한 디코딩
    enum CodingKeys: String, CodingKey, CaseIterable {
        case name, realname, nickname
    }

    init(from decoder: Decoder) throws {
        
        let container = try decoder.container(keyedBy: CodingKeys.self)
        // 코딩키들 가지고 있으면 디코딩하기
        // name, realname, nickname
        if let key = container.allKeys.filter({ CodingKeys.allCases.contains($0) }).first,
           let value = try container.decodeIfPresent(String.self, forKey: key) {
            self.name = value
        } else {
            self.name = ""
        }
    }
}