Difference between #5 and #4 of How to use single form to collect data for two or more models (CActiveForm and Ajax Validation edition)

With Yii you can use one
[CActiveForm](http://www.yiiframework.com/doc/api/1.1/CActiveForm/) for
collecting data for two or more models with ajax validation and client
validation. 

According [this
article](http://www.yiiframework.com/wiki/19/how-to-use-a-single-form-to-collect-data-for-two-or-more-models)
you can also create a form with ajax validation for both models. 

You have two models $a and $b. 

create.php
~~~
[php]
<?php $form = $this->beginWidget('CActiveForm', array(
    'id'=>'user-form',
    'enableAjaxValidation'=>true,
)); ?>

<?php echo $form->errorSummary(array($a,$b));

?> ?>

<div class="row">
    <?php echo $form->labelEx($a,'firstName'); ?>
    <?php echo $form->textField($a,'firstName'); ?>
    <?php echo $form->error($a,'firstName'); ?>
</div>
<div class="row">
    <?php echo $form->labelEx($b,'lastName'); ?>
    <?php echo $form->textField($b,'lastName'); ?>
    <?php echo $form->error($b,'lastName'); ?>
</div>

<?php $this->endWidget(); ?>
~~~

controller: 
~~~
[php]
public function actionCreate()
{
    $a=new User;
    $b=new Info;

    $this->performAjaxValidation(array($a,$b));
    if(isset($_POST['User'],$_POST['Info']))
    {
        $a->attributes=$_POST['User'];
        $b->attributes=$_POST['Info'];
        if($a->save() && $b->save())
            $this->redirect('index');
    }
    $this->render('create',array('a'=>$a,'b'=>$b));
}

protected function performAjaxValidation($models)
{
    if(isset($_POST['ajax']) && $_POST['ajax']==='user-form')
    {
        echo CActiveForm::validate($models);
        Yii::app()->end();
    }
}
~~~

Thats all, now you have form with 2 models and ajaxValidation.