/**
  * Delete author by id
  *
  * @param idAuthor
  * @return true when the operation was successful, otherwise false
  * @throws ServiceException
  */
 @Transactional(rollbackFor = ServiceException.class)
 @Override
 public boolean deleteAuthor(int idAuthor) throws ServiceException {
   boolean relationDeletedIsSuccess = newsService.deleteRelationForAuthorAndNewsByAuthor(idAuthor);
   boolean authorDeletedIsSuccess = authorService.deleteAuthor(idAuthor);
   return authorDeletedIsSuccess && relationDeletedIsSuccess;
 }