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 :

$_collection_selected=$_productCollection->addAttributeToFilter('manufacturer', array('eq' => 111));
    foreach ($_collection_selected as $_product_selected):

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

  • What is Block instance i.e. your $this, but most likely your collection is already been loaded.
    – Sergei Guk
    Commented Feb 28, 2014 at 19:15
  • What I meant it's already been loaded from magento and you can't filter it like that (not tested). And yes you need to use Code
    – Sergei Guk
    Commented Feb 28, 2014 at 19:22
  • yeah I got it mostly by magento.stackexchange.com/questions/9791/… it seems I am close to solution
    – Nickool
    Commented Feb 28, 2014 at 19:24
  • I think this might help stackoverflow.com/questions/5280392/…
    – Sergei Guk
    Commented Feb 28, 2014 at 19:26
  • what should i use for type_id?
    – Nickool
    Commented Feb 28, 2014 at 19:28

1 Answer 1


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
    Commented Feb 28, 2014 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
    Commented Feb 28, 2014 at 21:38
  • you don't know how much I should thank you! brilliant!
    – Nickool
    Commented Feb 28, 2014 at 21:48
  • Sounds like you made some progress :). Good luck with the rest!
    – Tim Hofman
    Commented Feb 28, 2014 at 21:54
  • yeah I learned a big tip from you,you solved my problem that i am struggling from the morning
    – Nickool
    Commented Feb 28, 2014 at 22:02

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