/**
* Adds the enrolment table for this class, and the custom field tables, if necessary, to the JOIN sql.
*
* @param array $filters An array of active filters to use to determne join sql.
* @return array An array of JOIN sql fragments.
*/
protected function get_join_sql(array $filters = array())
{
$joinsql = parent::get_join_sql($filters);
$joinsql[] = 'LEFT JOIN {local_elisprogram_cls_enrol} enrol ON enrol.classid=' . $this->classid . ' AND enrol.userid = element.id';
return $joinsql;
}
