DepartmentRepository::buildDepartmentsPriorityTree

public function buildDepartmentsPriorityTree($depId)
{
	$allParentDepartmentIds = $this->getAllParentDepartmentsIds($depId);

	return array_merge(
		['DR' . $depId],
		array_map(function ($id) {
			return 'DR' . $id;
		}, array_reverse($allParentDepartmentIds))
	);
}