php - Trying to get property of non-object in Comments model -

i make example comment model page model. yesterday fine, when today go check comments have error http://pastebin.com/ve1g5q6n.

comment.php

<?php  /**  * model class table "{{comment}}".  *  * followings available columns in table '{{comment}}':  * @property integer $id  * @property string $content  * @property integer $page_id  * @property integer $created  * @property integer $user_id  * @property string $guest  */ class comment extends cactiverecord {     public $verifycode;      /**      * returns static model of specified ar class.      * @param string $classname active record class name.      * @return comment static model class      */     public static function model($classname=__class__)     {         return parent::model($classname);     }      /**      * @return string associated database table name      */     public function tablename()     {         return '{{comment}}';     }      /**      * @return array validation rules model attributes.      */     public function rules()     {         // note: should define rules attributes         // receive user inputs.         return array(             array('content', 'required'),             array('content, guest', 'required', 'on'=>'guest'),             array('page_id, created, user_id', 'numerical', 'integeronly'=>true),             array('guest', 'length', 'max'=>255),             array('content', 'safe'),             // following rule used search().             // please remove attributes should not searched.             array('verifycode', 'captcha', 'allowempty'=>!ccaptcha::checkrequirements(), 'on'=>'guest'),             array('id, content, page_id, created, user_id, guest, status', 'safe', 'on'=>'search'),         );     }      /**      * @return array relational rules.      */     public function relations()     {         // note: may need adjust relation name , related         // class name relations automatically generated below.         return array(             'user'=>array(self::belongs_to, 'user', 'user_id'),             'page'=>array(self::belongs_to, 'page', 'page_id'),         );     }      /**      * @return array customized attribute labels (name=>label)      */     public function attributelabels()     {         return array(             'id' => 'id',             'content' => 'Текст',             'page_id' => 'Страница',             'created' => 'Дата',             'user_id' => 'Пользователь',             'guest' => 'Имя (гость)',             'status' => 'Статус',         );     }      /**      * retrieves list of models based on current search/filter conditions.      * @return cactivedataprovider data provider can return models based on search/filter conditions.      */     public function search()     {         // warning: please modify following code remove attributes         // should not searched.          $criteria=new cdbcriteria;          $criteria->compare('id',$this->id);         $criteria->compare('content',$this->content,true);         $criteria->compare('page_id',$this->page_id);         $criteria->compare('created',$this->created);         $criteria->compare('user_id',$this->user_id);         $criteria->compare('guest',$this->guest,true);         $criteria->compare('status',$this->status,true);          return new cactivedataprovider($this, array(             'criteria'=>$criteria,         ));     }      public function beforesave()     {         if ($this->isnewrecord){             $this->created = time();         }          if (!yii::app()->user->isguest) {             $this->user_id = yii::app()->user->id;         }          return parent::beforesave();     }      public static function getcomment($page_id)     {         $criteria = new cdbcriteria;          $criteria->compare('page_id', $page_id);         $criteria->compare('status', 1);          $criteria->order = 'created desc';          return new cactivedataprovider('comment', array(             'criteria'=>$criteria,         ));     } } 

commentcontroller.php

<?php  class commentcontroller extends controller {     /**      * @return array action filters      */     public function filters()     {         return array(             'accesscontrol', // perform access control crud operations             'postonly + delete', // allow deletion via post request         );     }      /**      * specifies access control rules.      * method used 'accesscontrol' filter.      * @return array access control rules      */     public function accessrules()     {         return array(             array('allow',  // allow users perform 'index' , 'view' actions                 'actions'=>array('index','view','create','update','delete'),                 'roles'=>array('2'),             ),             array('deny',  // deny users                 'users'=>array('*'),             ),         );     }      /**      * displays particular model.      * @param integer $id id of model displayed      */     public function actionview($id)     {         $this->render('view',array(             'model'=>$this->loadmodel($id),         ));     }      /**      * creates new model.      * if creation successful, browser redirected 'view' page.      */     public function actioncreate()     {         $model=new comment;          // uncomment following line if ajax validation needed         // $this->performajaxvalidation($model);          if(isset($_post['comment']))         {             $model->attributes=$_post['comment'];             if($model->save())                 $this->redirect(array('view','id'=>$model->id));         }          $this->render('create',array(             'model'=>$model,         ));     }      /**      * updates particular model.      * if update successful, browser redirected 'view' page.      * @param integer $id id of model updated      */     public function actionupdate($id)     {         $model=$this->loadmodel($id);          // uncomment following line if ajax validation needed         // $this->performajaxvalidation($model);          if(isset($_post['comment']))         {             $model->attributes=$_post['comment'];             if($model->save())                 $this->redirect(array('view','id'=>$model->id));         }          $this->render('update',array(             'model'=>$model,         ));     }      /**      * deletes particular model.      * if deletion successful, browser redirected 'admin' page.      * @param integer $id id of model deleted      */     public function actiondelete($id)     {         $this->loadmodel($id)->delete();          // if ajax request (triggered deletion via admin grid view), should not redirect browser         if(!isset($_get['ajax']))             $this->redirect(isset($_post['returnurl']) ? $_post['returnurl'] : array('index'));     }      /**      * manages models.      */     public function actionindex()     {         $model=new comment('search');         $model->unsetattributes();  // clear default values         if(isset($_get['comment']))             $model->attributes=$_get['comment'];          $this->render('index',array(             'model'=>$model,         ));     }      /**      * returns data model based on primary key given in variable.      * if data model not found, http exception raised.      * @param integer $id id of model loaded      * @return comment loaded model      * @throws chttpexception      */     public function loadmodel($id)     {         $model=comment::model()->findbypk($id);         if($model===null)             throw new chttpexception(404,'the requested page not exist.');         return $model;     }      /**      * performs ajax validation.      * @param comment $model model validated      */     protected function performajaxvalidation($model)     {         if(isset($_post['ajax']) && $_post['ajax']==='comment-form')         {             echo cactiveform::validate($model);             yii::app()->end();         }     } } 

view/index.php

<?php /* @var $this commentcontroller */ /* @var $model comment */  yii::app()->clientscript->registerscript('search', " $('.search-button').click(function(){     $('.search-form').toggle();     return false; }); $('.search-form form').submit(function(){     $('#comment-grid').yiigridview('update', {         data: $(this).serialize()     });     return false; }); "); ?>  <h1>Журнал комментариев</h1>  <?php echo chtml::link('Расширенный поиск','#',array('class'=>'search-button')); ?> <div class="search-form" style="display:none"> <?php $this->renderpartial('_search',array(     'model'=>$model, )); ?> </div><!-- search-form -->  <?php $this->widget('zii.widgets.grid.cgridview', array(     'id'=>'comment-grid',     'dataprovider'=>$model->search(),     'filter'=>$model,     'columns'=>array(         'id'=>array(             'name'=>'id',             'headerhtmloptions'=>array('width'=>30),         ),         'status'=>array(             'name'=>'status',             'value'=>'($data->status==1)?"Доступно":"Скрыто"',             'filter'=>array(0=>"Скрыто",1=>"Доступно"),         ),         'content',         'page_id'=>array(             'name'=>'page_id',             'value'=>'$data->page->title',             'filter'=>page::getpage(),         ),         'created'=>array(             'name'=>'created',             'value'=>'date("j.m.y. h:i", $data->created)',             'filter'=>false,         ),         'user_id'=>array(             'name'=>'user_id',             'value'=>'$data->user->username',             'filter'=>user::getusername(),         ),         'guest',         array(             'class'=>'cbuttoncolumn',             'updatebuttonoptions'=>array('style'=>'display:none'),         ),     ), )); ?> 

view/view.php

<?php /* @var $this commentcontroller */ /* @var $model comment */  $this->menu=array(     array('label'=>'Журнал комментариев', 'url'=>array('index')),     array('label'=>'Удалить комментарий', 'url'=>'#',           'linkoptions'=>array('submit'=>array('delete','id'=>$model->id),           'confirm'=>'Вы уверены что хотите удалить этот комментарий?')), ); ?>  <h1>Просмотр комментария #<?php echo $model->id; ?></h1>  <?php $this->widget('zii.widgets.cdetailview', array(     'data'=>$model,     'attributes'=>array(         'id',         'content',         'page_id',         'created',         'user_id',         'guest',     ), )); ?> 

view/_search.php

<?php /* @var $this commentcontroller */ /* @var $model comment */ /* @var $form cactiveform */ ?>  <div class="wide form">  <?php $form=$this->beginwidget('cactiveform', array(     'action'=>yii::app()->createurl($this->route),     'method'=>'get', )); ?>      <div class="row">         <?php echo $form->label($model,'id'); ?>         <?php echo $form->textfield($model,'id'); ?>     </div>      <div class="row">         <?php echo $form->label($model,'status'); ?>         <?php echo $form->dropdownlist($model,'status', array(''=>'',0=>"Скрыто",1=>"Доступно")); ?>     </div>     <div class="row">         <?php echo $form->label($model,'content'); ?>         <?php echo $form->textarea($model,'content',array('rows'=>6, 'cols'=>50)); ?>     </div>      <div class="row">         <?php echo $form->label($model,'page_id'); ?>         <?php echo $form->dropdownlist($model,'page_id',page::getpage(),array('empty'=>'')); ?>     </div>      <div class="row">         <?php echo $form->label($model,'user_id'); ?>         <?php echo $form->dropdownlist($model,'user_id',user::getusername(),array('empty'=>'')); ?>     </div>      <div class="row">         <?php echo $form->label($model,'guest'); ?>         <?php echo $form->textfield($model,'guest',array('size'=>60,'maxlength'=>255)); ?>     </div>      <div class="row buttons">         <?php echo chtml::submitbutton('Поиск'); ?>     </div>  <?php $this->endwidget(); ?>  </div><!-- search-form --> 

this issue being generated when yii tries evaluate code have inside gridview column values. make sure each property you're referencing exists on $data.

since issue started happening, guess culprit "value" => "$data->page->title". there's new record doesn't have page relationship, so$data->page null.

edit

actually, didn't notice before, error output highlights property reference ccomponent->evaluateexpression("$data->user->username", array("data" => comment, "row" => 0)). same reasons described above, $data->user null.