yiiapi/demos/blog/protected/controllers/CommentController.php

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<?php

class CommentController extends Controller
{
	public $layout='column2';

	/**
	 * @var CActiveRecord the currently loaded data model instance.
	 */
	private $_model;

	/**
	 * @return array action filters
	 */
	public function filters()
	{
		return array(
			'accessControl', // perform access control for CRUD operations
		);
	}

	/**
	 * Specifies the access control rules.
	 * This method is used by the 'accessControl' filter.
	 * @return array access control rules
	 */
	public function accessRules()
	{
		return array(
			array('allow', // allow authenticated users to access all actions
				'users'=>array('@'),
			),
			array('deny',  // deny all users
				'users'=>array('*'),
			),
		);
	}

	/**
	 * Updates a particular model.
	 * If update is successful, the browser will be redirected to the 'view' page.
	 */
	public function actionUpdate()
	{
		$model=$this->loadModel();
		if(isset($_POST['ajax']) && $_POST['ajax']==='comment-form')
		{
			echo CActiveForm::validate($model);
			Yii::app()->end();
		}
		if(isset($_POST['Comment']))
		{
			$model->attributes=$_POST['Comment'];
			if($model->save())
				$this->redirect(array('index'));
		}

		$this->render('update',array(
			'model'=>$model,
		));