/**
* This method populates this instance with the already chosen study areas.
*
* @param string the course's ID
*
* @return void
*/
private function populateAreasForCourse($id)
{
$areas = StudipStudyArea::getStudyAreasForCourse($id);
$this->setAreas($areas);
$this->sortAreas();
}
function get_area_ids($course_id)
{
$selection = StudipStudyArea::getStudyAreasForCourse($course_id);
return array_keys($selection->toGroupedArray('sem_tree_id'));
}
