public static void Update(this FlightModel dbFlight, UpsertFlightModel flight)
 {
     dbFlight.From  = flight.From;
     dbFlight.To    = flight.To;
     dbFlight.Price = flight.Price;
     dbFlight.Date  = flight.Date;
 }
        public static FlightModel Save(this UpsertFlightModel flight)
        {
            var newItem = new FlightModel
            {
                Id    = Repository.Flights.Max(f => f.Id) + 1,
                To    = flight.To,
                From  = flight.From,
                Price = flight.Price,
                Date  = flight.Date
            };

            Repository.Flights.Add(newItem);
            return(newItem);
        }