Select2 not storing ID

[ebraho]

Hi All, I am using select2 extension. But when trying to save (create) record even though I select from the list, it gives the error "Teilnehmer cannot be blank."

View: $this->widget('ext.select2.ESelect2', array( 'model'=>$model, 'attribute' => 'cTeilnehmerID', 'data'=>CHtml::listData(Teilnehmer::model()->findAll(),'cTeilnehmerID','fullName'), 'options'=>array( 'width'=>'300px', 'placeholder'=>' -- please select -- ', 'sourceUrl'=>array('buchung/autoComplete'), ) )); Controller: public function actionAutoComplete() {

            $criteria = new CDbCriteria;
            $criteria->select = array('cTeilnehmerID','cVorname','cNachname');

            $criteria->addSearchCondition('cVorname',  strtoupper( $_GET['term']) ) ;
            $criteria->addSearchCondition('cNachname', strtoupper ( $_GET['term']), true, 'or');
            $criteria->addSearchCondition('CONCAT(cVorname," ",cNachname)', strtoupper ( $_GET['term']), true, 'or');

            $criteria->limit = 15;
            $data = Teilnehmer::model()->findAll($criteria);

            $res = array();

            foreach ($data as $item) {

                    $res[] = array(
                                    'id' => $item->cTeilnehmerID,
                                    'value' => $item->fullName,
                                    'label' => $item->fullName,
                    );

            }

            echo CJSON::encode($res);
    }