<?php
// in your model
...
public function getPackingSize()
{
return $this->packing_size_1 . $this->packing_size_2 . $this->packing_size_3;
}
...
// then change your grid like so
$this->widget('zii.widgets.CDetailView', array(
'data'=>$model,
'attributes'=>array(
'packingSize',
/*
'packing_size_1',
'packing_size_2',
'packing_size_3',
*/
),
));