public function validateBaseClass($attribute, $params)
{
$class = @Yii::import($this->baseClass, true);
if (!is_string($class) || !$this->classExists($class)) {
$this->addError('baseClass', "Class '{$this->baseClass}' does not exist or has syntax error.");
} elseif ($class !== 'CActiveRecord' && !is_subclass_of($class, 'CActiveRecord')) {
$this->addError('baseClass', "'{$this->model}' must extend from CActiveRecord.");
}
}