<?php
actionReadGroup($id) {
if (!Yii::app()->user->checkAccess('readGroup', array(
    'groupId' => $id,
))) {
    throw new
};
}

// БИЗНЕС ПРАВИЛО:

(bool) Yii::app()->db->createCommand("SELECT ...",)
    ->queryScalar(array(
        'grp' =>  $params['groupId'],
        'user' => $params['userId'],
        'someData' => $data['foo'],
    ));

$rule = new ReadGroupRule($params, $data); $rule->check();

ReadGroupRule