public Beverage GetBeverage(string beverageString)
{
var(beverageId, err) = this.ParseStringToIntId(beverageString);
if (err != null)
{
throw new InvalidOperationException(err);
}
var beverage = _barService.GetBeverages(new int[] { beverageId })
.FirstOrDefault(b => b.Id == beverageId);
if (beverage == null)
{
throw new InvalidOperationException($"No beverages with id {beverageId} were found\n");
}
return(beverage);
}