dynamic var owner = RealmMessageOwner.receiver.rawValue
    dynamic var type = RealmMessageType.text.rawValue
    @objc dynamic var content = ""
    @objc dynamic var timestamp = 0
    @objc dynamic var isRead = false

    override static func primaryKey() -> String? {
    return "messageKey"
}

   convenience init(owner: RealmMessageOwner, type: RealmMessageType, content: String, timestamp: Int, isRead: Bool, messageKey: String) {
    self.init()
    self.owner = owner.rawValue
    self.type = type.rawValue
    self.content = content
    self.timestamp = timestamp
    self.isRead = isRead
    self.messageKey = messageKey

    }
    }

 enum RealmMessageOwner: String {
 case sender
 case receiver
 }

 enum RealmMessageType: String {
 case photo
 case text
 case location
 }

var items: Results<RealmMessage>!

  switch self.items[indexPath.row].owner {
    case .receiver:
     switch self.items[indexPath.row].type {
        case .text:
        case .photo:
        case .location:
        }
    case .sender:
        switch self.items[indexPath.row].type {
        case .text:
        case .photo:
        case .location:
        }
     }