public async Task UpdateAsync([FromBody] InstrumentEditModel model)
        {
            try
            {
                var instrument = Mapper.Map <Instrument>(model);

                await _instrumentService.UpdateAsync(instrument);
            }
            catch (EntityNotFoundException)
            {
                throw new ValidationApiException(HttpStatusCode.NotFound, "Instrument does not exist.");
            }
        }
        public async Task AddAsync([FromBody] InstrumentEditModel model)
        {
            try
            {
                var instrument = Mapper.Map <Instrument>(model);

                await _instrumentService.AddAsync(instrument);
            }
            catch (InvalidOperationException exception)
            {
                throw new ValidationApiException(HttpStatusCode.BadRequest, exception.Message);
            }
        }