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I want to select ids of a specific brand when I have the name and the Id of a product for example 111

I found out the ID of manufacturer by using getManufacturer()

I used this code in template/catalog/product/list.phtml :

$_productCollection=$this->getLoadedProductCollection();
$_collection_selected=$_productCollection->addAttributeToFilter('manufacturer', array('eq' => 111));
    foreach ($_collection_selected as $_product_selected):
                $product_selected_ids[]=$_product_selected->getId();
                 print_r($product_selected_ids);
            endforeach;

but it shows me all the products I don't know what is wrong?

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Your problem probably lies in the fact that the collection you try to adjust is already loaded. When a collection is loaded, the query is already executed and the data is ready for usage in the collection.

The only way to adjust the collection after loading is by calling a $collection->clear(). If you want mor detailed technical information you can check the Mage_Catalog_Model_Resource_Product_Collection in which the clear() method can be found.

  • I didn't write $this->getLoadedProductCollection() it was there before and it doesn't have problem and I don't change it so no need to call it – Nickool Feb 28 '14 at 21:30
  • Yes, correct. The call was already there and you did not made a change it. But afterwards, the 2nd line in your snippet, you try to append a attribute filter to that very collection. This new attribute filter will be ignored by Magento, since the collection you try to adjust is already in a 'loaded' state. Hence the result is still all the products. You can only apply attribute filters before the collection is loaded. Hence the loaded state must be cleared as I tried to explain in my answer. – Tim Hofman Feb 28 '14 at 21:38
  • you don't know how much I should thank you! brilliant! – Nickool Feb 28 '14 at 21:48
  • Sounds like you made some progress :). Good luck with the rest! – Tim Hofman Feb 28 '14 at 21:54
  • yeah I learned a big tip from you,you solved my problem that i am struggling from the morning – Nickool Feb 28 '14 at 22:02

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