public function platforms($field_list = array(), $limit = 100, $offset = 0, $filter = array(), $sort = array()) {
    $params = array(
      'field_list'  => implode(',', $field_list),
      'limit'       => $limit,
      'offset'      => $offset,
      'sort'        => $this->format_filter($sort),
      'filter'      => $this->format_filter($filter)
    );

    return $this->get_objects('platforms', $params);
  }