DrugSetItem::relations PHP Method

    public function relations()
    {
        // NOTE: you may need to adjust the relation name and the related
        // class name for the relations automatically generated below.
        return array('drug' => array(self::BELONGS_TO, 'Drug', 'drug_id'), 'drug_set' => array(self::BELONGS_TO, 'DrugSet', 'drug_set_id'), 'frequency' => array(self::BELONGS_TO, 'DrugFrequency', 'frequency_id'), 'duration' => array(self::BELONGS_TO, 'DrugDuration', 'duration_id'), 'tapers' => array(self::HAS_MANY, 'DrugSetItemTaper', 'item_id'));
    }