public function rules()
{
// NOTE: you should only define rules for those attributes that
// will receive user inputs.
return array(array('product_option_id, product_id, option_id, option_value_id, quantity, subtract, price, price_prefix, points, points_prefix, weight, weight_prefix', 'required'), array('product_option_id, product_id, option_id, option_value_id, quantity, subtract, points', 'numerical', 'integerOnly' => true), array('price, weight', 'length', 'max' => 15), array('price_prefix, points_prefix, weight_prefix', 'length', 'max' => 1), array('product_option_value_id, product_option_id, product_id, option_id, option_value_id, quantity, subtract, price, price_prefix, points, points_prefix, weight, weight_prefix', 'safe', 'on' => 'search'));
}