Rewriting core/Mage/Catalog/controllers/Product/CompareController.php

Question

I'm trying to extend the "Mage_Catalog_Product_CompareController" class with my own class which is "Invent_Catalog_Product_CompareController" from the core.

But I can't seem to get the results that i am looking for. I suspect the problem on my config xml here is my config.xml

<config>
<frontend>
    <routers>
        <catalog>
            <args>
                <modules>
                    <invent_catalog before="Mage_Catalog">Invent_Catalog</invent_catalog>
                </modules>
            </args>
        </catalog>
    </routers>
</frontend>
</config>

and here is my CompareController.php

require_once(Mage::getModuleDir('controllers','Mage_Catalog').DS.'CompareController.php');
class Invent_Catalog_Product_CompareController extends Mage_Catalog_Product_CompareController

 public function addAction()
    {
      //My Code goes here
   }

Answer 1

I think the problem is your require_once statement. It does not include the correct file.

require_once(Mage::getModuleDir('controllers','Mage_Catalog').DS.'CompareController.php');

Will include the file Mage/Catalog/controllers/CompareController.php
What you want is Mage/Catalog/controllers/Product/CompareController.php
For this use:

require_once(Mage::getModuleDir('controllers','Mage_Catalog').DS.'Product'.DS.'CompareController.php');