Creating a PDF document from a filtered CGridView - Yii - yii

Question

I am trying to create a PDF from a filtered CGridView. The value will be passed via dropdown in Advanced search but the problem is that i am unable to filter the search by my pdf function.
Controller
public function actionPrint() {
$mPDF1 = Yii::app()->ePdf->mpdf('ar','A4','14','dejavusanscondensed');
$model=new Country('search');
$model->center_id = 1;// This value will be passed from dropdown
//and i want the report to be made on this
$model->unsetAttributes();
if(isset($_GET['Country']))
$model->attributes=$_GET['Country'];
$html = '';
$html .= $this->renderPartial('candidates', array('model'=>$model, 'enablePagination' => false),true);
$mPDF1->WriteHTML($html, false);
$mPDF1->Output('list.pdf','D');
}
View
$this->widget('zii.widgets.grid.CGridView', array(
'id'=>'country-grid',
'dataProvider'=>$model->search($enablePagination),
'summaryText' => '',
// 'enablePagination' => false,
'filter'=>$model,
'columns'=>array(
'name',
array(
'header'=>' Total Registered Candidates',
'value'=>'$data->itemsTotal',
),
),
));
echo CHtml::link(
'Save as PDF',
Yii::app()->createUrl('country/print'),
array('class'=>'btnPrint btn btn-danger','target'=>'_blank'));
Model
public function search($enablePagination = true)
{
$criteria->together= true;
$criteria->with=array('center');
$criteria->compare('center.name', $this->center_id, true);
..........
if ($enablePagination)
{
$pagination = array(
'pageSize' => 30,
);
}
else
{
$pagination = false;
}
return new CActiveDataProvider($model, array(
'criteria' => $criteria,
'pagination' => $pagination,
));
}

Answer 1

Since center_id is a foreign key the line
$criteria->compare('center.name', $this->center_id, true);
should read
$criteria->compare('center_id', $this->center_id);
You could also do the following but this adds a condition on the joined table and could lead to slower queries.
$criteria->compare('center.id', $this->center_id);