Buddypress Group Activity Loop Filter activity type [closed]

I have created this function in bp-custom.php page.

function filtering_activity_default( $query ) {
  if ( empty( $query ) && empty( $_POST ) ) {
    $query = 'action=activity_update,joined_group';
  }
  return $query;
}

add_filter( 'bp_ajax_querystring', 'filtering_activity_default', 999 );

This is working for me as expected.