/**
  * @description Adds new drug into the site_subspecialty_drug table - AJAX call only
  *
  * @return string
  */
 public function actionCommonDrugsAdd()
 {
     $drugId = $this->request->getParam('drug_id');
     $siteId = $this->request->getParam('site_id');
     $subspecialtyId = $this->request->getParam('subspecialty_id');
     if (!Yii::app()->request->isAjaxRequest) {
         $this->render('errorpage', array('errormessage' => 'notajaxcall'));
     } else {
         if (!is_numeric($drugId) || !is_numeric($siteId) || !is_numeric($subspecialtyId)) {
             echo 'error';
         } else {
             $newSSD = new SiteSubspecialtyDrug();
             $newSSD->site_id = $siteId;
             $newSSD->subspecialty_id = $subspecialtyId;
             $newSSD->drug_id = $drugId;
             if ($newSSD->save()) {
                 echo 'success';
             } else {
                 echo 'error';
             }
         }
     }
 }