protected function beforeValidate()
{
    $this->uploadFiles();

    if ($this->hasAttribute('author') && empty($this->author))
        $this->author = Yii::app()->user->id;

    return parent::beforeValidate();
}

protected function uploadFiles()
{
    foreach ($this->rules() as $rule) {
        if (in_array("file", $rule)) {
            $attributes = explode(",", $rule[0]);
            foreach ($attributes as $attribute) {
                $image = CUploadedFile::getInstance($this, $attribute);

                if (is_object($image)) {
                    $filename = md5(rand(1, 99999) . $image) . $image;
                    $image->saveAs('images/site/manufacturers/' . $filename);
                    $this->$attribute = 'images/site/manufacturers/' . $filename;
                }
            }
        }
    }
}