code: public QueryBuilder addParentIds(final Integer id1, final Integer... ids) {
          parentIds.add(id1);
          parentIds.addAll(Arrays.asList(ids));
          return this;
      }
docs: Add the provided parent IDs to the set of query constraints.
  @param id1 the first parent ID to add
  @param ids the subsequent parent IDs to add
  @return this