/**
* Sums all the deleted and undeleted items.
* @param array $query_params lik eEEM_Base::get_all
* @param string $field_to_sum
* @reutrn int
*/
public function sum_deleted_and_undeleted($query_params = null, $field_to_sum = null)
{
$query_params = $this->_alter_query_params_so_deleted_and_undeleted_items_included($query_params);
parent::sum($query_params, $field_to_sum);
}
