I'm developing a bundle product module for magento 1.7

The module is working as expected with bundle products, however, issue appears with standard Magento configurable products - once I select size (simple product) and add it to cart, it automatically doubles product quantity.

For example:

  • if we have an Item 'X' in Size 'S' Qty = 1 : we will not be able to add it to the cart and there will be "The requested quantity for Item 'X' is not available"
  • Although if we change Item 'X' in Size 'S' Qty = 2, but still adding Item 'X' in Size 'S' Qty = 1 to cart, then we are able to cart and checkout this item (note!! at this step magento will create an invoice with correct qty = 1 and prices, but once order is placed, Magento back-end will remove qty=2 from db row)

I have extended Mage_Checkout_Model_Cart with following:

 * Get request for product add to cart procedure
 * @param   mixed $requestInfo
 * @return  Varien_Object
protected function _getProductRequest($requestInfo)
    if ($requestInfo instanceof Varien_Object) {
        $request = $requestInfo;
    elseif (is_numeric($requestInfo)) {
        $request = new Varien_Object(array('qty' => $requestInfo));

    else {

                foreach($requestInfo['bundle_simple_custom_options'] as $id => $opt){
                    foreach($opt['options'] as $key => $o){
                        $opt['options'][$key] = $requestInfo['options'][$key];
                        $requestInfo['bundle_simple_custom_options'][$id] = $opt;
        $request = new Varien_Object($requestInfo);

    if (!$request->hasQty()) {

    return $request;


Could it be that qty double comes because the system is adding qty=1 from extended bundle cart function and qty=1 from standard configurable cart function?

If any further info required, please let me know.

1 Answer 1


Is difficult to say without knowing what your bundle product module does or whether it handles with Qty. Do you have some observer checking for such in any add_to_cart events?

I have seen that for bundles even when the Qty of the whole bundle is 0 in the product detail view, this get increased to 1 when you add it in cart.

You can debug this file to start with something: app/design/frontend/base/default/template/catalog/product/view/addtocart.phtml check output here: echo $this->getProductDefaultQty() * 1

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