Fix Category Url Filter in Magento Layered Navigation

www.yoursite.com/electronics.html?cat=12->www.yoursite.com/electronics/cameras.html

This can be fixed quite easily by overriding the getUrl() method in the Mage_Catalog_Model_Layer_Filter_Item class (Accessible at: /app/code/core/Mage/Catalog/Model/Layer/Filter/Item.php)

The code

Right, down to the fun part! Locate the function at line 57, it should look like this:

public function getUrl()

{

    $query = array(

        $this->getFilter()->getRequestVar()=>$this->getValue(),

        Mage::getBlockSingleton('page/html_pager')->getPageVarName() => null // exclude current page from urls

    );

    return Mage::getUrl('*/*/*', array('_current'=>true, '_use_rewrite'=>true, '_query'=>$query));

}




Now you need to edit this code and put in a condition to check for the presence of the category filter (“cat” request variable). With this we first load the category object using its ID, and then retrieve the correct category URL.
The next section below (lines 7-12) checks if the current request includes any other query string parameters, and builds a new query string accordingly.
Finally, this query string is added to the category URL and returned.

public function getUrl()

{

    if($this->getFilter()->getRequestVar() == "cat"){

        $category_url = Mage::getModel('catalog/category')->load($this->getValue())->getUrl();

        $return = $category_url;

        $request = Mage::getUrl('*/*/*', array('_current'=>true, '_use_rewrite'=>true));

        if(strpos($request,'?') !== false ){

            $query_string = substr($request,strpos($request,'?'));

        }

        else{

            $query_string = '';

        }

        if(!empty($query_string)){

            $return .= $query_string;

        }

        return $return;

    }

    else{

        $query = array(

            $this->getFilter()->getRequestVar()=>$this->getValue(),

            Mage::getBlockSingleton('page/html_pager')->getPageVarName() => null // exclude current page from urls

        );

         

        return Mage::getUrl('*/*/*', array('_current'=>true, '_use_rewrite'=>true, '_query'=>$query));

    }

}