Question

this might be a silly question, but well. I have the following code that retrieves all the products on my shop.

$products = Mage::getModel('catalog/product')->getCollection();
$products->addAttributeToFilter('status', 1);
$products->addAttributeToFilter('visibility', 4);
$products->addAttributeToFilter('type_id', 'simple');
$products->addAttributeToSelect('*');
$products->addStoreFilter($storeId);
$prodIds = $products->getAllIds();

Im aware of the:

$category = Mage::getModel('catalog/category')->load(9);
$products->addCategoryFilter($category);

to filter by a category ID, but how to get all products except one specific category ID ? (Magento 1.6.2)

Answer 1

I think this should work, presuming you know what category ID you want to filter out, but I can’t test it right now

$catId = 9;

/* I'm almost positive 'e' is the alias used for catalog_product_entity, check your
   query with echo (string) $products->getSelect(); if it doesn't work */
$products->getSelect()->join(array('cats' => 'catalog_category_product'), 'cats.product_id = e.entity_id');
$products->getSelect()->where('cats.category_id', array('neq' => $catId));