Better AR with Yii - 3

Foo.php

<?php
class Foo extends CActiveRecord {
    public function scopes()
    {
        return array(
            'newestFirst'=>array(
                'order'=>'created_on DESC',
            ),
            'newestLast'=>array(
                'order'=>'created_on ASC',
            ),
            'onlyUnread'=>array(
                'condition'=>array('read', 0),
            ),
        );
    }
}

FooController.php

<?php
class FooController extends Controller {
    public function actionIndex()
    {
        $this->render('index',array(
            'dataProvider' => new CActiveDataProvider(
                Foo::model()->newestFirst()
            ),
        ));
    }
    public function actionUnreads()
    {
        $this->render('unreads',array(
            'dataProvider' => new CActiveDataProvider(
                Foo::model()->onlyUnread()->newestLast()
            ),
        ));
    }
}