             else { return nil }
 
         self.createdAt = createdAt
-        self.guid = guid
         self.id = id
         self.locale = locale
         self.timezone = timezone


extension User : Serializable {
    static let deleted = User(createdAt: Date(),
                              guid: "",
                              id: "",
                              locale: "",
                              timezone: "",

    public func toDictionary() -> JSONDictionary {
        var dict : JSONDictionary = [
            "created_at" : dateFormatter.string(from: createdAt),
            "id" : id,
            "locale" : locale,
            "timezone" : timezone,
