public async Task <IActionResult> CreateAttendeeForItemId(string itemId, AttendeeAddViewModel model)
        {
            if (!await _itemRepository.ExistItemByIdAsync(itemId))
            {
                return(NotFound());
            }

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

            _attendeeRepository.CreateAttendeeForItemId(itemId, entity);

            var result = await _attendeeRepository.SaveAsync();

            if (!result)
            {
                return(BadRequest());
            }

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

            return(CreatedAtRoute(nameof(GetAttendeeByIdForItemId), new { itemId, attendeeId = returnModel.Id }, returnModel));
        }