public async Task <ActionResult <AttendeeViewModel> > GetAttendeeByIdForItemId(string itemId, string attendeeId)
        {
            if (!await _itemRepository.ExistItemByIdAsync(itemId))
            {
                return(NotFound());
            }

            var entity = await _attendeeRepository.GetAttendeeByIdForItemIdAsync(itemId, attendeeId);

            var model = _mapper.Map <AttendeeViewModel>(entity);

            return(Ok(model));
        }