code: @Override
      public Map<String, Object> toSource() {
          Map<String, Object> sourceMap = new HashMap<>();
          if (gidNumber != null) {
              addFieldToSource(sourceMap, "gidNumber", gidNumber);
          }
          if (name != null) {
              addFieldToSource(sourceMap, "name", name);
          }
          return sourceMap;
      }
docs: ======