Well, I'm having a category filled only with grouped products and I want these ones to be filtered by their associated ( and simple ) products's attributes.

Until now I've used a dirty workaround : I've left only one simple product to be visible to catalog but hidden by html & css.
That way the attributes were appearing and I could use them for the grouped products also, but I've noticed that layered navigation dissapears if that hidden simple product is not appearing when I filter by price.

Any ideas or workarounds?


1 Answer 1


You need to rewrite how Mage_Catalog_Model_Layer builds the attribute collection using the current product collection's attribute sets:

protected function _getSetIds()
    $key = $this->getStateKey().'_SET_IDS';
    $setIds = $this->getAggregator()->getCacheData($key);

    if ($setIds === null) {
        $setIds = $this->getProductCollection()->getSetIds();
        $this->getAggregator()->saveCacheData($setIds, $key, $this->getStateTags());

    return $setIds;

For this context, you'll want to check the product collection for grouped products and return the attribute set IDs of grouped children. These are then evaluated in getFilterableAttributes():

public function getFilterableAttributes()
    $setIds = $this->_getSetIds();
    if (!$setIds) {
        return array();
    /** @var $collection Mage_Catalog_Model_Resource_Product_Attribute_Collection */
    $collection = Mage::getResourceModel('catalog/product_attribute_collection');
        ->setOrder('position', 'ASC');
    $collection = $this->_prepareAttributeCollection($collection);

    return $collection;

You will likely need to deal with the cache key. I would develop with block caching off and then test extensively with it on.

  • Thanks for answering my question. I will try your workaround in a couple of days and I'll get back to you with some news. Commented Sep 21, 2013 at 21:38
  • Thanks a lot. I've made a simple check with Mage::registry('current_category'); and then I've just edited the getSetIds variable. But how could I automate the process and apply the same method for all categories and search page also? I can't loop through all getProductCollection() because there are lots of products, simple and grouped, from different categories. Any advices? Commented Oct 18, 2013 at 5:19

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