dynamic var transactionID : Int = -1
dynamic var registrationPlate : String = ""
dynamic var locationID : Int = 0
dynamic var time : String = ""
dynamic var subscription : String = ""
dynamic var startTime : NSDate = NSDate()
dynamic var endTime : NSDate = NSDate()
dynamic var status : Int = -2
dynamic var requestType : Int = -1
var extensions : List<ExtensionDB> = List<ExtensionDB>()
dynamic var price : Double = 0
dynamic var currency : String = ""
private dynamic var test : Int = 10


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

class var sharedInstance : TransactionDB
{
    struct Singleton
    {
        static let instance = TransactionDB()
    }
    return Singleton.instance
}

static func saveOrUpdate ......

let realm = try! Realm()
    try! realm.write {
        TransactionDB.sharedInstance.time = ""
    }