@Transactional(readOnly = true, propagation = Propagation.SUPPORTS)
 @Override
 public ResponseDTO getResponseByUserAndSurvey(String user, long surveyId) {
   JpaResponse jpaResponse = jpaSurveyDao.getResponseByUserAndSurvey(user, surveyId);
   return jpaResponse == null ? null : surveyMapper.toResponse(jpaResponse);
 }