Add Qty to Product before adding to cart

Question

I am looking for an event observer which is suitable for my requirements.

My requirement is I add to cart the product but qty I want to add to this cart will be decided by the product attribute.

I will be having a custom attribute called attribute1 which will have an integer number.

So when I add to cart the product, I will get the attribute and number which is defined in it and I set this number as a qty to the product which is getting added to cart.

So following are the observers I tried, but not getting any success checkout_cart_product_add_after and I am looking for event something like checkout_cart_product_add_before but it seems not their.

Please help me.

Answer 1

You could use the sales_quote_product_add_after event. You can access there the added quote items and change the quantity. Just be careful not to change the quantity for items that have a parent set (you can check if $item->getParentItem() is set).

Answer 2

I don't know the code you have used, but it works with checkout_cart_product_add_after and set quantity on $strockItem instead of $product:

public function checkoutCartProductAddAfter(Varien_Event_Observer $observer)
{
    $product = $observer->getProduct();
    $stockItem = $product->getStockItem();
    $stockItem->setQty($product->getData('attribute1'));
    $stockItem->save();
}

Answer 3

I would say that the best approach is using the min sale qty this way the quantity added to the cart will be the value that you have set.

Answer 4

You can rewrite Mage_Checkout_CartController or check if any third party module have rewrite Mage_Checkout_CartController class already then use that class to rewrite,

In AddAction function - get attribute1 value and setParam qty = attribute1 of getRequest. Then call - parent::AddAction(); - So that this wont break the original code of magento.

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