Yii, CGridView not showing records of a certain attribute - yii

Question

So I have created records and each has their own particular Service field. They are all filled up (not null).
In the MySQL database, there are also records of that field Service
But in my CGridView, my Service field is all blank. All the Service fields are blank for all the records. When I click on the button View - The one with the magnifying glass, it says Service - Not Set
Can I know what may cause the problem? Please help me Thanks!
UPDATED WITH CGRIDVIEW CODE
<?php $this->widget('zii.widgets.grid.CGridView', array(
'id' => 'booking-grid',
'htmlOptions'=>array('class'=>'grid-view grid-size'),
'dataProvider' => $model->search(),
'filter' => $model,
'columns' => array(
array(
'name'=>'date',
'htmlOptions'=>array('style'=>'text-align:center', 'height'=>'50px', 'width'=>'80px'),
'headerHtmlOptions'=>array('height'=>'30px'),
),
array(
'name'=>'timeStart',
'header'=>"Time",
'htmlOptions'=>array('style'=>'text-align:center', 'width'=>'80px'),
),
array(
'name'=>'client_id',
'value'=>'GxHtml::valueEx($data->client)',
'filter'=>GxHtml::listDataEx(Client::model()->findAllAttributes(null, true)),
'htmlOptions'=>array('width'=>'200px'),
),
array(
'name'=>'service_id',
'value'=>'GxHtml::valueEx($data->service)',
'filter'=>GxHtml::listDataEx(Service::model()->findAllAttributes(null, true)),
),
array(
'name' => 'complete',
'header'=>'Status',
'value' => '($data->complete == 0) ? Yii::t(\'app\', \'Open\') : Yii::t(\'app\', \'Close\')',
'filter' => array('0' => Yii::t('app', 'Open'), '1' => Yii::t('app', 'Close')),
'htmlOptions'=>array('width'=>'60px', 'style'=>'text-align:center'),
),
'remarks',
array(
'class' => 'CButtonColumn',
'visible'=>true,
'htmlOptions'=>array('width'=>'70px'),
'template' => '{view}{update}{delete}{changeComplete}',
'buttons'=>array(
'view' => array(
'visible'=>"true",
),
'update' => array(
'visible'=>"true",
),
'delete' => array(
'visible'=>"UserIdentity::isRoleMember('Admin')",
),
'changeComplete' => array(
'visible' => '$data->complete=="0"',
'imageUrl' => 'images/complete.png',
'options' => array(
'title' => 'Complete',
),
'url' => 'Yii::app()->createUrl("booking/changeComplete", array("id"=>$data->id))',
'click' => "function(){
$.fn.yiiGridView.update(\"booking-grid\", {
type:'POST',
url:$(this).attr('href'),
success:function(data) {
$.fn.yiiGridView.update(\"booking-grid\");
}
})
return false;
}",
),
),
),
))); ?>
I have tried looking at other CGridViews with the same field, they look the same and they're working perfectly fine.

Answer 1

I think the problem is $data->service. Probably your data has a relation with the Service entity. So for accessing attributes of Service you should use $data->service->attributeName.