docs: public Iterable<BoxItem.Info> getChildren(String sort, SortDirection direction, final String... fields) {
          QueryStringBuilder builder = new QueryStringBuilder()
                  .appendParam("sort", sort)
                  .appendParam("direction", direction.toString());
  
          if (fields.length > 0) {
              builder.appendParam("fields", fields).toString();
          }
          final String query = builder.toString();
          return new Iterable<BoxItem.Info>() {
              @Override
              public Iterator<BoxItem.Info> iterator() {
                  URL url = GET_ITEMS_URL.buildWithQuery(getAPI().getBaseURL(), query, getID());
                  return new BoxItemIterator(getAPI(), url);
              }
          };
      }