Magento checkout_cart_product_add_before and get number of products added

Question

I created the event checkout_cart_product_add_before: http://markshust.com/2012/08/27/create-checkout_cart_product_add_before-observer-magento

Hoever when I do this the getQuoteItem() seems to be unavailable, so I cannot get to the number of products added to cart. When I use the _after method I can use:

public function checkStock2($observer) {
  Mage::log("Check stock before");
  $request = $observer->getQuoteItem();
  Mage::log("q in order = " .$request['qty'] ."");
}

However when I am before I cannot reach the getQuoteItem as it is not there yet. Is there a way I could get the number of products the user is trying to add to the cart?

Thanks!

Answer 1

If you implemented the linked observer, you're missing the information you need. You have to add the request in your dispatchEvent, in order to check what the user chose :

public function addProduct($productInfo, $requestInfo=null)
    {
        $product = $this->_getProduct($productInfo);
        $request = $this->_getProductRequest($requestInfo);
        Mage::dispatchEvent('checkout_cart_product_add_before', array(
             'product' => $product,
              'request' => $request
        ));

        return parent::addProduct($productInfo, $requestInfo);
    }

Then you'll be able to retrieve the user quantity in your observer with :

$observer->getEvent()->getRequest()->getQty();

the ->getRequest() method refers to a magic getter for the "request" parameter of your dispatchEvent.