public (int?, ApiError?) UpdateStock(ApiClient current_client, Guid car_id, int new_stock)
{
(var car, var maybe_error) = CheckAccess(current_client, car_id);
if (maybe_error is ApiError error)
{
return(null, error);
}
// Always create a new object rather than updating the old
// so there will be no partial updates in the car objects.
var new_car = new Car
{
Make = car.Make,
Model = car.Model,
Year = car.Year,
Stock = new_stock,
Client = car.Client,
Id = car.Id,
UpdateCount = car.UpdateCount + 1
};
if (!_carsRepository.TryUpdate(car_id, new_car, car))
{
return(null, ApiError.Conflict($"Car (ID {car_id}) has been updated by someone else"));
}
return(car.Stock, null);
}
