3.swift

/// To support a new class family, create an enum that conforms to this protocol and contains the different types.
protocol ClassFamily: Decodable {
    /// The discriminator key.
    static var discriminator: Discriminator { get }

    /// Returns the class type of the object coresponding to the value.
    func getType() -> AnyObject.Type
}

/// Discriminator key enum used to retrieve discriminator fields in JSON payloads.
enum Discriminator: String, CodingKey {
    case type = "type"
}