/**
* Save a {@link question_usage_by_activity} to the database. This works either
* if the usage was newly created by {@link make_questions_usage_by_activity()}
* or loaded from the database using {@link load_questions_usage_by_activity()}
* @param question_usage_by_activity the usage to save.
*/
public static function save_questions_usage_by_activity(question_usage_by_activity $quba)
{
$dm = new question_engine_data_mapper();
$observer = $quba->get_observer();
if ($observer instanceof question_engine_unit_of_work) {
$observer->save($dm);
} else {
$dm->insert_questions_usage_by_activity($quba);
}
}
