Layered Navigation On product Page Not Working because of URL [closed]

Question

i'm using layered navigation in product view page.

On click on any filter, it's simply appending those filter at the end of current url

Example,

This is my current product page url,

http://host.com/mento17/index.php/category/product1.html

On same product page if i filter by price, i'm redirecing to

http://host.com/mento17/lovablenew/index.php/category/product1.html&price=100-500

I should go to category listing page,

http://host.com/mento17/index.php/category.html&price=100-500

getUrl() is the function which is generating url from /app/code/core/Mage/Catalog/Model/Layer/Filter/Item.php

It's mentioned like below,

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));
    }

Above function simply appending filter at the end of current url. This works fine in category page but not in product page.

Is there any way to make it work in product page by altering url ?

Answer 1

The question already contains half of the answer.

Rewrite the mentioned class app/code/core/Mage/Catalog/Model/Layer/Filter/Item.php and determine if we at the product page. For example like if(Mage::registry('current_product')) then get the first category of the current product and its URL as a base.