import ObjectMapper
import RealmSwift
import ObjectMapper_Realm
class User: Object, Mappable {
  dynamic var username: NSString?
  var friends: List<User>?
  required convenience init?(_ map: Map) {
    self.init()
  }
  override class func primaryKey() -> String? {
    return "username"
  }
  func mapping(map: Map) {
    username              <- map["username"]
    friends               <- (map["friends"], ListTransform<User>())
  }
}

class User: Object, Mappable {
    func mapping(map: Map) {
        username              <- map["username"]
        friends               <- (map["friends"], ListTransform<User>(onSerialize: onSerialize))
    }
    private func onSerialize(users: List<User>) {
        let realm = Storage.shared.realm
        try! realm.write {
            realm.add(users, update: .modified)
        }
    }
}