Which file does Prestashop handles stock reduction after purchase?

[octagonal elf]

Hi. I believe Prestashop reduces the stock quantity after every purchases, I wonder which file does Prestashop handles that? I would like to modify in a way that Prestashop reduces quantities for all combinations after every purchases instead of only reduces stock for the selected combinations. Any idea?

 

 

Update:

I found that perhaps I could make changes on OrderDetail.php, whereby the updateQuantity( ) function is used. Now the problem is it involves "id_product_attribute" for the quantity to be updated. How do I make changes so that it updates stock quantity based on "id_product" and ignore "id_product_attribute"? Thanks...

 

$update_quantity = StockAvailable::updateQuantity($product['id_product'], $product['id_product_attribute'], -(int)$product['cart_quantity']);

Edited July 22, 2017 by octagonal elf (see edit history)