Add shipping on subtotal after discount

Question

I want to add freeshipping on subtotal but after discount i already have tried with

if ($request->getFreeShipping() 
|| $request->getPackageValueWithDiscount() >= $this->getConfigData('free_shipping_subtotal')) {
    ...
}

But this only takes subtotal not and discount did anyone know how can I get subtotal after discount.

Thanks

Answer 1

As long as your collectTotals order is to calculate discount first then using $request->getPackageValueWithDiscount() will be the discounted total.

See Mage_Sales_Model_Quote_Address:

 $packageValueWithDiscount = $item
        ? $item->getBaseRowTotal() - $item->getBaseDiscountAmount()
        : $this->getBaseSubtotalWithDiscount();
    $request->setPackageValueWithDiscount($packageValueWithDiscount);