private function inject_periods()
{
$periods = new Period();
$periods->order_by('sorting', 'asc');
$query = $periods->get_raw();
$data = array(NULL => '');
if ($query->num_rows() > 0) {
foreach ($query->result() as $row) {
$data[(int) $row->id] = $row->name;
}
}
$this->parser->assign('periods', $data);
$query->free_result();
}
