I'm using Observer.php

public function updateProductPrice(Varien_Event_Observer $observer){
    $quote = Mage::getModel('checkout/cart')->getQuote();
    $allItems = $quote ->getAllItems();

    foreach($allItems as $itemE){
         if($v == $count_itms){
            $itemE->setSku($itemE->getSku(). '_' .$this->hash());
            Mage::log('** THIS PRICE FROM '.$price);

public function hash(){
    generated_hash_code = '34drfedE';
    return generated_hash_code;

Firs time I get the price, for the current sku I changed the sku appending some hash at the end. I save the cart also the session (checkout/session), (checkout/cart) is working. BUT the second time when I'm trying to insert a new product(the same product) with the same sku but with different price the session and the cart are not changed.


  1. the information on cart that are displayed from where are toked. (to now where i should save);

  2. difference between: getModel('checkout/cart') and helper('checkout/cart') ?

  3. where is calculated the price in cartcontroller ?

  4. To find another solution ... I can create a new product (custom product with this price, different sku, different id ).

  5. How can I overwrite cartcontroller? ...some xml? Thx.

1 Answer 1


I found the solution: I override the getItemByProduct() method in Mage_Sales_Model_Quote.

public function getItemByProduct($product){

    if($product->getData('showconfigurator') == 1){
        return false;
        foreach ($this->getAllItems() as $item) {
            if ($item->representProduct($product)) {
                return $item;
        return false;

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