public IActionResult Create(AchCustomerAlergen newItem)
        {
            var newId = _context.AchCustomerAlergen.OrderByDescending(i => i.CustomerAlergenId).FirstOrDefault().CustomerAlergenId + 1;

            newItem.CustomerAlergenId = newId;


            _context.AchCustomerAlergen.Add(newItem);
            _context.SaveChanges();
            return(StatusCode(201, newItem));
        }
        public IActionResult Update(int item_id, AchCustomerAlergen updated_item)
        {
            var item = _context.AchCustomerAlergen.Count(e => e.CustomerAlergenId == item_id);

            if (item == 0)
            {
                return(NotFound());
            }

            _context.AchCustomerAlergen.Attach(updated_item);
            _context.Entry(updated_item).State = EntityState.Modified;
            _context.SaveChanges();
            return(Ok(updated_item));
        }