declare
  map             record;
begin

  if new.member_state = old.member_state then
    return new;
  end if;

  for map in select group_id, element_id, rel_type
             from group_element_index
             where rel_id = new.rel_id
  loop
    if new.member_state = 'approved' then
      perform party_approved_member__add(map.group_id, map.element_id, new.rel_id, map.rel_type);
    else
      perform party_approved_member__remove(map.group_id, map.element_id, new.rel_id, map.rel_type);
    end if;
  end loop;

  return new;

end;