Magento 1.9 – Identify the Right Collection in catalog_product_collection_load_after

event-observermagento-1.9product-collectionproduct-list

I want to do some processing on the products list (the products shown when browsing categories etc) before they are rendered.

I tried using the catalog_product_collection_load_after event, but its called on any products collection used, which include things like recently viewed items, related items, etc. and I only want to react on the time its called for the actual main products list.

I tried to filter the events by checking things like block type/name, controller name, page category etc, but they all proved to be insufficient to distinguish between the event on the main product list and other spam.

so my question:

how can I edit the products list before they are shown via events (eg without editing Magento core code / temlates)?
if your answer is "observe the catalog_product_collection_load_after event": how do I know which of the many product collections loaded is the main products grid?

thanks!

Best Answer

You can use the event catalog_block_product_list_collection.
This one is dispatched in the product list block.

Related Solutions

Magento – On Search Result: Group Products by Category

I've used the Display Products Grouped By Subcategories extension on category list pages before with success.

Another solution before we found this extension was to get the collection in the block and use a special attribute to order the collection. The code was as follows (only works under PHP 5.3)

class Class_Name
{
    [...]
    protected function _getProductCollection()
    {
        [...]

        $collection = $this->_productCollection;

        $collection->addAttributeToSelect('category_sort_value');


        // Do some fancy sorting
        $collectionReflection = new ReflectionObject($collection);
        $itemsPropertyReflection = $collectionReflection->getProperty('_items');
        $itemsPropertyReflection->setAccessible(true); // Make it accessible

        $collectionItems = $itemsPropertyReflection->getValue($collection);

        usort($collectionItems, array("Class_Name", "cmp"));

        $itemsPropertyReflection->setValue($collectionReflection, $collectionItems);

        $itemsPropertyReflection->setAccessible(false); // Return restriction back
        // End them fancyness

        $this->_productCollection = $collection;

        return $this->_productCollection;
    }

    public function cmp($a, $b) 
    {
        $a_sort = (int)$a->getData('category_sort_value');
        $b_sort = (int)$b->getData('category_sort_value');

        if ($a_sort == $b_sort) return 0;
        return ($a_sort < $b_sort) ? -1 : 1;
    }
}

You can use this class example to extend the Block class for the product list in search and sort the results like that. I hope this will help you in the right direction.

Magento – Observer (event hook) for media or images

Try the event catalog_product_gallery_upload_image_after this should be fired on the upload action of the controller Mage_Adminhtml_Catalog_Product_GalleryController from your question I think this is the right event for you.

Best Answer

Related Solutions

Magento – On Search Result: Group Products by Category

Magento – Observer (event hook) for media or images

Related Topic