Use Json Codable Inheritance Classes

CodableInheritanceClasses.playground

import UIKit

open class BaseModel : Codable {
	var deviceName: String?
	
	private enum CodingKeys: String, CodingKey { case deviceName }
	
	init() { }
	
	public func encode(to encoder: Encoder) throws {
		var container = encoder.container(keyedBy: CodingKeys.self)
		try container.encode(deviceName, forKey: .deviceName)
	}
	
	required public init(from decoder: Decoder) throws {
		let container = try decoder.container(keyedBy: CodingKeys.self)
		deviceName = try container.decode(String.self, forKey: .deviceName)
	}
}

final public class MyModel: BaseModel {
	var username: String?
	
	private enum CodingKeys: String, CodingKey { case username }
	
	override init() { super.init() }
	
	required init(from decoder: Decoder) throws {
		try super.init(from: decoder)
		let container = try decoder.container(keyedBy: CodingKeys.self)
		username = try container.decode(String.self, forKey: .username)
	}
	
	override public func encode(to encoder: Encoder) throws {
		try super.encode(to: encoder)
		var container = encoder.container(keyedBy: CodingKeys.self)
		try container.encode(username, forKey: .username)
	}
}

// MARK: Encoder Example

let model = MyModel()
model.username = "1"
model.deviceName = "1"

let encoder = JSONEncoder()
let encodedJson = try encoder.encode(model)
let stringJson = String(data: encodedJson, encoding: .utf8)!
print("Encoded String: ", stringJson)


// MARK: Decoder Example

let jsonData = #"{"deviceName": "iPhone 7", "username":"Yunus TEK"}"#.data(using: .utf8)!
let decoder = JSONDecoder()
let superClass = try decoder.decode(MyModel.self, from: jsonData)
print("Decoded String: ", superClass.deviceName!, superClass.username!)