添加自定义属性以在magento中过滤产品集合

Question

I need to add custom attribute to filter for product collection

I tried below code but filter is not working

$_productCollections=$this->getLoadedProductCollection();
$_productCollection = $_productCollections->addAttributeToFilter('weight', array('lt' => 100));

below code is working

$collection = Mage::getModel('catalog/product')->getCollection();
$_productCollection = $collection->addAttributeToFilter('weight', array('lt' => 100));

I need proper way to add filter range for weight attribute like

->addAttributeToFilter('weight', array('lt' => 100));

in default product collection($this->getLoadedProductCollection();)

Answer 1

I have one solution for this question

Step1:

Duplicate block code for list

\app\code\core\Mage\Catalog\Block\Product\List.php to 
\app\code\local\Mage\Catalog\Block\Product\List.php

Step2:

Change below code from

$this->_productCollection = $layer->getProductCollection();

to

$this->_productCollection = $layer->getProductCollection()->addAttributeToFilter('weight', array('lt' => 100));

This is one simple solution to resolve your issue properly.