public ClientOrder.OrderLine AsClientOrderLine() { var line = new ClientOrder.OrderLine(); line.DrinkId = API.Ordering.Domain.Drinks.DrinkId.From(DrinkId); line.DrinkSizeId = API.Ordering.Domain.Drinks.DrinkSizeId.From(SizeId); line.AddInIds = AddIns?.Select(AddInId.From).ToList() ?? new List <AddInId>(); line.Count = Count; return(line); }