Magento change shipping rate in one page checkout for COD

Question

My question is quite simple. I need to change the shipping rate cost in one page checkout to "0" once the user select COD as payment method in one page checkout. I think I can do this easely with an observer. Could you please helpme to know what event should I observe?.

Can I use checkout_controller_onepage_save_shipping_method ?. Any kind of help will be highly appreciated!!

Details Posted By OP as answer

I override the Mage_Checkout_Model_Type_Onepage class and modify the savePayment method. Then I did this:

1.- A first try:

public function savePayment($data)
{
.....
....
$payment = $quote->getPayment();
$payment->importData($data);
$quote->save();

//My custom code
if($data['method']=='cashondelivery'){
        $shipping = $quote->getShippingAddress();
        $address = $quote->getBillingAddress();
        $shipping->addData($address)->setShippingMethod('flatrate_flatrate');
    }

Where my flatrate_flatrate is 0. Unfortunately it doesn't work well. This snippet set to 0 my Grant Total.

My second try was:

public function savePayment($data)
{
.....
....
$payment = $quote->getPayment();
$payment->importData($data);
$quote->save();

//My custom code
if($data['method']=='cashondelivery'){
        $this->getQuote()->getShippingAddress()->setShippingAmount(0);
        $this->getQuote()->getShippingAddress()->setBaseShippingAmount(0);
    }

This code works but only a few times, I don't understand why ??.. Could somebody helpme to fix this please?. Any kind of help will be highly appreciated.

Kind regards!

---

Ok. Now I have this and it works but it doesn't update the grand total amount. Even the order is processed with the normal shipping cost. I mean, finally it doesn't update anything. Could somebody in someway give me a hand on this please?.

     if($data['method']=='cashondelivery'){
        $quote->getShippingAddress()->setShippingMethod('flatrate_flatrate');
        $quote->getShippingAddress()->setShippingAmount(0);
        $quote->getShippingAddress()->setBaseShippingAmount(0);
        $quote->getShippingAddress()->setShippingInclTax(0);
        $quote->getShippingAddress()->setBaseShippingInclTax(0);
        $quote->collectTotals(); 
        $quote->save();
    }

Warming regards!

---

Ok, I did something crazy but it seems it works (at least partially). I override Mage_Checkout_OnepageController too and add it a new method call actualizaShippingMethodAction.

It looks like this:

public function actualizaShippingMethodAction()
{
    if ($this->_expireAjax()) {
        return;
    }
    if ($this->getRequest()->isPost()) {
        $data = $this->getRequest()->getPost('shipping_method', '');
        $result = $this->getOnepage()->saveShippingMethod($data);
        // $result will contain error data if shipping method is empty
        if (!$result) {
            $this->getOnepage()->getQuote()->collectTotals();
        }
        $this->getOnepage()->getQuote()->collectTotals()->save();
    }
}

Now in my original class that is overriding (Mage_Checkout_Model_Type_Onepage) I did this.

if($data['method']=='cashondelivery'){
        $cliente = new Varien_Http_Client();
        $_configuracion = array('maxredirects'=>5, 'timeout'=>30);
        $llamada = Mage::getBaseUrl()."checkout/onepage/actualizaShippingMethod/";
        $cliente->setUri($llamada)
        ->setConfig($_configuracion)
        ->setMethod(Zend_Http_Client::POST)
        ->setParameterPost('shipping_method','flatrate_flatrate');

        $respuesta = $cliente->request();
        $quote->getShippingAddress()->setShippingAmount(0);
        $quote->getShippingAddress()->setBaseShippingAmount(0);
        $quote->getShippingAddress()->setShippingInclTax(0);
        $quote->getShippingAddress()->setBaseShippingInclTax(0);
        $quote->collectTotals()->save();
    }

    $this->getCheckout()
        ->setStepData('payment', 'complete', true)
        ->setStepData('review', 'allow', true);

    return array();

Now the order is passing without shipping cost as spected but the order review (summary) is not updating the final costs. And I thinks this solution has a bug because if the user returns and select another payment method the shipping cost is 0 again.

Any kind of help, whatever, will be highly, highly appreciated

THANKS

Answer 1

Finally I have a solution and I think is an answer to the original question. If not please pardon me.

Forget to override savePayment($data) on Mage_Checkout_Model_Type_Onepage. Just focus on overriding Mage_Checkout_OnepageController, and add to the savePaymentAction() method the following code.

            $data = $this->getRequest()->getPost('payment', array());

        /*Custom code*/
        if($data['method']=='cashondelivery'){//Only if payment method is cashondelivery
            $result = $this->getOnepage()->savePayment($data);
            // get section and redirect data
            $redirectUrl = $this->getOnepage()->getQuote()->getPayment()->getCheckoutRedirectUrl();
            if (empty($result['error']) && !$redirectUrl) {
                $this->loadLayout('checkout_onepage_review');
                $result['goto_section'] = 'review';
                $result['update_section'] = array(
                    'name' => 'review',
                    'html' => $this->_getReviewHtml()
                );
            }
            if ($redirectUrl) {
                $result['redirect'] = $redirectUrl;
            }

            //Update totals for Shipping Methods
            $resultado = $this->getOnepage()->saveShippingMethod('flatrate_flatrate');
            $this->getOnepage()->getQuote()->collectTotals()->save();


        }else{

            $result = $this->getOnepage()->savePayment($data);
            // get section and redirect data
            $redirectUrl = $this->getOnepage()->getQuote()->getPayment()->getCheckoutRedirectUrl();
            if (empty($result['error']) && !$redirectUrl) {
                $this->loadLayout('checkout_onepage_review');
                $result['goto_section'] = 'review';
                $result['update_section'] = array(
                    'name' => 'review',
                    'html' => $this->_getReviewHtml()
                );
            }
            if ($redirectUrl) {
                $result['redirect'] = $redirectUrl;
            }

            //Return the original values according with the initial user sellection
            //I use a session variable to store the original selection
            $shippingMethod = Mage::getSingleton('core/session')->getShippingInicial();
            $resultado = $this->getOnepage()->saveShippingMethod($shippingMethod);
            $this->getOnepage()->getQuote()->collectTotals()->save();

        }


    } catch (Mage_Payment_Exception $e) {
        if ($e->getFields()) {
  ...

Then you have to override saveShippingMethodAction() and add the following code.

...

 $result = $this->getOnepage()->saveShippingMethod($data);

        //We store the Shipping Method initial selection

        Mage::getSingleton('core/session')->setShippingInicial($data);

        // $result will contain error data if shipping method is empty
        if (!$result) { ...

If you test this you will find that it works as expected. But now it takes 2 loading times to correctly show the total costs in the review part. I read this question ( IWD one page checkout extension Magento: review refresh ) but it doesn't help a lot.

Could somebody point me in the right direction to update the review part twice?.

WARMING REGARDS!

Could somebody have an idea how to achieve this?. Regards!