I have CGridView with relation

admin.php in Media view

<?php $this->widget('zii.widgets.grid.CGridView', array(
'id'=>'media-grid',
'dataProvider'=>$model->search(),
'filter'=>$model,
'columns'=>array(
'id',
'caption',
array(
'name' => 'gallery_id',
'value' => '$data->gallery->name',
'filter' => CHtml::listData(Gallery::model()->findAll(), 'id', 'name'),
),
),
array(
'class'=>'CButtonColumn',
),
),
)); ?>


Gallery.php Model

class Gallery extends CActiveRecord
{
. . .
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(
. . .
'gallery' => array(self::HAS_MANY, 'Media', 'gallery_id'),
);
}
. . .
}


Media.php Model

class Media extends CActiveRecord
{

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(
. . .
'gallery' => array(self::BELONGS_TO, 'Gallery', 'gallery_id'),
);
}
}


I see this error

Error 500
Trying to get property of non-object


Error in line

'value' => '$data->gallery->name',