public ActionResult <CurrencyRateDTO> Add([FromBody] CurrencyRateDTO currencyRateDTO)
{
if (_srv.GetByCurrencyIds(currencyRateDTO.BaseCurrencyId, currencyRateDTO.TargetCurrencyId) != null)
{
throw new ApplicationException("Currency Pair rate already exists");
}
var addedCurrencyRate = _srv.Add(currencyRateDTO);
_unitOfWork.Commit();
return(CreatedAtAction(nameof(GetById), new { id = addedCurrencyRate.Id }, _srv.MapToDTO(addedCurrencyRate)));
}