Yii Cgridview CColumn button visibiity

Question

I am creating hospital System..

Here when admitted patient's discharge date is null, then only i want to make visible DISCHARGE button in Cgrid view CColumn Button.

discharge date is going into indoor model.

PatientController Code:

public function actionAdmin()
{
    $model=new Patient('search');

    $discharge_date=Indoor::model()->find(array('condition'=>'patient_id=:id','params'=>array(':id'=>????????????)));

    $model->unsetAttributes();  // clear any default values
    if(isset($_GET['Patient']))
        $model->attributes=$_GET['Patient'];

    $this->render('admin',array(
        'model'=>$model,
        'discharge_date'=>$discharge_date->discharge_date,
    ));
}

patient/admin:

array(
        'class'=>'CButtonColumn',

        'template'=>'{update} {view} {collection} {discharge}',

        'buttons'=>array
         (

            'collection' => array
            (
                'label'=>'Collection',
                'url'=>'Yii::app()->createUrl("invoice/index", array("id"=>$data->id))',
                'options'=>array('class'=>'btn btn-success btn-mini'),
            ),


           'discharge' => array
            (
                'label'=>'Discharge',
                 'url'=>'Yii::app()->createUrl("invoice/index", array("id"=>$data->id))',
                'options'=>array('class'=>'btn btn-info btn-mini'),
                'visible'=>'is_null($discharge_date)?true:false;'
            ),

        ),

please tell should i use for loop to get each patient's id in controller?? now i have written '?????????' for it..

n what is error in visible code???

thanks in advance..

Answer 1

删除单引号，然后它将正常工作...尝试这个

'visible'=> is_null($discharge_date)?true:false