OptionValue::rules PHP Method

    public function rules()
    {
        // NOTE: you should only define rules for those attributes that
        // will receive user inputs.
        return array(array('option_id, image, sort_order', 'required'), array('option_id, sort_order', 'numerical', 'integerOnly' => true), array('image', 'length', 'max' => 255), array('option_value_id, option_id, image, sort_order', 'safe', 'on' => 'search'));
    }