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How do I filter out products from certain categories from Magento search? 
Jr. Member
Total Posts:  1
Joined:  2011-07-26

I tried adding the following on Mage/Catalog/Block/Product/List.php, _getProductCollection()

->addAttributeToFilter('category_id', array('nin' => array('36,37'),));
But it came up with:

Fatal error: Call to a member function getBackend() on a non-object in C:\app\code\core\Mage\Eav\Model\Entity\Abstract.php on line 816
I suspected it was because it was looking for an attribute that product doesn’t have “category_id” and I tried adding:

->joinField('category_id''catalog/category_product''category_id''product_id = entity_id'null'left')
addAttributeToFilter('category_id', array('nin' => array('36,37'),));
But that brings up another error:

Joined field with this alias is already declared”
What am I doing wrong?
Is Mage/Catalog/Block/Product/List.php the correct file to apply this overwrite?
I just want it to apply to the search results i.e catalogsearch/result/

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