Magento automatically removes product items from shopping cart page which is out of stock. You may need this feature when the situation arises where the product goes out of stock and that particular product is already there in other customer’s cart who have not yet checked it out. With this script, Magento will auto-check if all the items in the cart are available and in-stock before proceeding for checkout page.

In config.xml file:

1
2
3
4
5
6
7
8
9
10
11
<events>
  <controller_action_predispatch_checkout_cart_index>
    <observers>
      <namespace_module_autoremove_outofstock>
        <type>singleton</type>
        <class>namespace_module/observer</class>
        <method>autoRemoveOutOfStockItems</method>
      </namespace_module_autoremove_outofstock>
    </observers>
  </controller_action_predispatch_checkout_cart_index>
</events>

In Observer.php file:

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
public function autoRemoveOutOfStockItems($observer) {
    $quote = Mage::getModel('checkout/session')->getQuote();
    $cartItems = $quote->getAllItems();
    foreach ($cartItems as $item)
    {
        //$productType = $item->getProduct()->getTypeId();
        //if($productType!='configurable') {
        $productId = $item->getProductId();
        $product = Mage::getModel('catalog/product')->load($productId);
        $stockItem = $product->getStockItem();
        if(!$stockItem->getIsInStock())
        {
                Mage::helper('checkout/cart')->getCart()->removeItem($item->getId())->save();
        }
        //}
    }

}