public async Task <IActionResult> AddExpertPredictions(int id,
                                                               [FromBody] ExpertPredictionsWriteDto expertPredictions)
        {
            var nickname = expertPredictions.Nickname;
            var expertId = await _mediator.Send(new GetIdByNickname(nickname));

            if (expertId == null)
            {
                return(NotFound());
            }

            _tempData.AddPrediction(expertPredictions);

            var addExpertTourPredictions =
                new AddExpertTourPredictions(expertId.Value, id, expertPredictions.Predictions);

            var isCompletedSuccessfully = await _mediator.Send(addExpertTourPredictions);


            if (isCompletedSuccessfully)
            {
                return(Ok());
            }
            else
            {
                return(new StatusCodeResult(StatusCodes.Status500InternalServerError));
            }
        }