I have a product with a custom attribute, which works fine almost everywhere I use it.

However, when I try to get this attribute's value during the catalog_product_get_final_price event, I get null returned. Also, when I print the product's data, this attribute is not shown.

Is there a logical reason for this? How can I retrieve the value of this attribute?

I suspect that because this event is fired during the create/update of a quote item, not the original product data is used, but a (partial) snapshot of it's data. If that is the case; how might I make my attribute available in this snapshot as well?


<?xml version="1.0"?>


class My_Module_Model_Observer
     * @param  Varien_Event_Observer $observer
     * @return void
    public function calculateItemPrice( Varien_Event_Observer $observer )
        $event   = $observer->getEvent();
        $product = $event->getProduct();

        // folowing returns NULL


When I debug the $observer object in the event observer, I get the following data;

Varien_Event_Observer (
    [_data:protected] => Array
            [event] => Varien_Event(...)
            [product] => Mage_Catalog_Model_Product(...)
            [qty] => 1
    [_hasDataChanges:protected] => TRUE
    [_origData:protected] => NULL
    [_idFieldName:protected] => NULL
    [_underscoreCache:static:protected] => Array(...)
    [_isDeleted:protected] => FALSE
    [_oldFieldsMap:protected] => Array()
    [_syncFieldsMap:protected] => Array()
  • Do you want the value of the quote item? Because there are no products in the cart... Commented May 27, 2014 at 13:17
  • Can you add your code to the question?
    – Marius
    Commented May 27, 2014 at 13:43
  • update; added some code
    – Maurice
    Commented May 27, 2014 at 14:01

1 Answer 1


Not sure about this but I thought to throw it in here, maybe I'm right, or maybe it gives you a nudge in the right direction.
I think your suspicions are right. Because this call is made on a product that comes from a quote item, not all the attributes are loaded.

The quote item loads only the attributes specified in the config node global/sales/quote/item/product_attributes.
Try adding your attribute code between those attributes.
For this create a custom module (or use one that you have) and add this inside the config.xml file inside the <config> tag

                    <my_custrom_attribute /> <!-- your attribute code goes here -->

Clear the cache and give it a go.

  • That was exactly it! Cheers!
    – Maurice
    Commented May 27, 2014 at 14:14
  • in magento2 it would be catalog_attributes.xml but with lot less code.
    – R T
    Commented Oct 7, 2022 at 15:40

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