Codable.swift

struct Article: Codable {
    
    let tags: [Tag]
    let title: String
    
    enum CodingKeys: CodingKey
    {
        case k_tag
        case k_title
    }
    
    init(from decoder: Decoder) throws {
        let container = try decoder.container(keyedBy: CodingKeys.self)
        tags = try container.decode ([Tag].self, forKey: .k_tag)
        title = try container.decode (String.self, forKey: .k_title)
    }
    
    func encode(to encoder: Encoder) throws
    {
        var container = encoder.container(keyedBy: CodingKeys.self)
        try container.encode (tags, forKey: .k_tag)
        try container.encode (title, forKey: .k_title)
    }
}