I've build a module for changing the price while adding the product to the cart. This with the observer checkout_cart_product_add_after

Price is changing right, but I also want to change the weight for right calculation of shipping costs.

My Code:


public function updatePrice(Varien_Event_Observer $observer) {
    $item = $observer->getQuoteItem();
    $item = ( $item->getParentItem() ? $item->getParentItem() : $item );


  • I can see you are setting weight already, is it not working? Commented Jul 14, 2016 at 0:03

1 Answer 1


Use event sales_quote_item_set_product. I tried your code and it worked perfectly fine then.

  • Forget to say taht I cahnge the weight on product view.. Commented Jul 18, 2016 at 12:38
  • How are you changing the weight on product view? Its not possible until the quote is generated for the customer.
    – Twinkal
    Commented Jul 18, 2016 at 12:41
  • So when I try to change the weight after add to quote it should work? Commented Jul 19, 2016 at 13:18

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