I want add 2 lines code into but I want do this from my Extension How can I do this job ?

Don't want to add code to core file and then insert it into local folder

Is this possible add directly into my extension ?

I want add 2 lines below into


in the public function estimatePostAction()

under the $region = (string) $this->getRequest()->getParam('region');

Code is :

$cityDiff = $this->getRequest()->getParam('city');

2 Answers 2


according to your requirement, if you expect you extension can work on further version I suggest you use Observer to listen Magento event then add data to core/session.

in your config.xml, define event listener. if you know the exactly event you want to listen, or listen all controller post dispatch.



in your Model/Observer.php

class YOUDMOUDLE_Model_Observer {

public function listenControllerActionPostDispatch($observer)
        ->getControllerAction()->getFullActionName() == 'YOUR_TARGET')
        $cityDiff = Mage::app()->getRequest()->getParam('city');

  • 'YOUR_TARGET' is for example estimatePostAction ? that code will like ->getControllerAction()->getFullActionName() == 'estimatePostAction') or anything else ?
    – sIiiS
    Apr 9, 2014 at 6:19
  • the fullActionName is following the route rule, for example cart page is checkout_cart_index, and your case might be checkout_cart_estimate_post
    – Tai
    Apr 9, 2014 at 6:28
  • I have a file Observer in Model folder that use for another functions, added your code to it and code is public function listenControllerActionPostDispatch($observer) { if($observer->getEvent() ->getControllerAction()->getFullActionName() == 'checkout_cart_estimate_post') { $cityDiff = $this->getRequest()->getParam('city'); Mage::getSingleton('core/session')->setEstimatedCity($cityDiff); } } then added under my prev event in config.xml but nothing, seems your method is correct and I do wrong anything here! Is possible 2 observer function in one file ?
    – sIiiS
    Apr 9, 2014 at 6:44
  • yes, you can have multiple method in one observer file. you can echo the actionName before go into your condition. make sure Event catch.
    – Tai
    Apr 9, 2014 at 7:00
  • 1
    Finally work, thank you for your guide, but must use Mage::app() instead of $this in observer php file, also fullActionName is : checkout_cart_estimatePost
    – sIiiS
    Apr 9, 2014 at 10:31

I'm no expert but think it would be something like this - anyway hopefully gets you on the right track:

Mage_Checkout_CartController_New extends Mage_Checkout_CartController { /** * Initialize shipping information */ public function estimatePostAction() { $country = (string) $this->getRequest()->getParam('country_id'); $postcode = (string) $this->getRequest()->getParam('estimate_postcode'); $city = (string) $this->getRequest()->getParam('estimate_city'); $regionId = (string) $this->getRequest()->getParam('region_id'); $region = (string) $this->getRequest()->getParam('region'); $cityDiff = $this->getRequest()->getParam('city'); Mage::getSingleton('core/session')->setEstimatedCity($cityDiff); $this->_getQuote()->getShippingAddress() ->setCountryId($country) ->setCity($city) ->setPostcode($postcode) ->setRegionId($regionId) ->setRegion($region) ->setCollectShippingRates(true); $this->_getQuote()->save(); $this->_goBack(); } }

Sometimes config XML also needs to be told about the new overriding class? http://www.magentocommerce.com/boards/viewthread/14103/

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