php - Yii insert record instead of update -

i'm using yii framework regarding php code.

i have 3 methods in controller, 1 creating, 1 updating, 1 saving. creating , updating render same form.

everything works fine saving record. when updated record, creates new record. in update method, load existing record , correct value, when save saves in new record. i'm try $model->update() instead of $model->save(), got error cannot update new record.

thank in advance insights

method create

$model = new comment;          $this->renderpartial('_formcomment',array(                 'model'=>$model,                 'post_id'=>$post_id,)         );  

method update

$model=$this->loadmodel($comment_id);          $this->renderpartial('_formcomment',array(                 'model'=>$model,                 'post_id'=>$model->post_id,                 'comment_id'=>$model->id,)         ); 

method save

$comment=new comment;  if(isset($_post['comment']))     {         $model->attributes=$_post['comment'];          if($model->save()) {              echo ('save ok');                             }     } 

my loadmodel function called update method

if($this->_model===null)         {              $this->_model=comment::model()->findbypk($comment_id);             if($this->_model===null)                 throw new chttpexception(404,'the requested page not exist.');         }         return $this->_model; 

you have

$comment=new comment;  

in save method, create new model. need load existing model, set attributes , save it. pass $model in save method.