How do I filter out products from certain categories from Magento search? -


i tried adding following on mage/catalog/block/product/list.php, _getproductcollection()

 $this->_productcollection ->addattributetofilter('category_id', array('nin' => array('36,37'),));

but came with:

fatal error: call member function getbackend() on non-object in c:\app\code\core\mage\eav\model\entity\abstract.php on line 816

i suspected because looking attribute product doesn't have "category_id" , tried adding: 

 $this->_productcollection ->joinfield('category_id', 'catalog/category_product', 'category_id', 'product_id = entity_id', null, 'left')     ->addattributetofilter('category_id', array('nin' => array('36,37'),));

but brings error: 

joined field alias declared"

what doing wrong?
mage/catalog/block/product/list.php correct file apply overwrite?
want apply search results i.e catalogsearch/result/

try using ** ->addcategoriesfilter($category);** instead of ->addattributetofilter(

it works me :)


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