docs: @Override
      public DataMedia findById(Long dataMediaId) {
          Assert.assertNotNull(dataMediaId);
          List<DataMedia> dataMedias = listByIds(dataMediaId);
          if (dataMedias.size() != 1) {
              String exceptionCause = "query dataMediaId:" + dataMediaId + " but return " + dataMedias.size()
                                      + " dataMedia.";
              logger.error("ERROR ## " + exceptionCause);
              throw new ManagerException(exceptionCause);
          }
          return dataMedias.get(0);
  
      }