Remove quantity of item in cart

Question

The Problem

I'm looking at removing a specific quantity of an item that I already know is within the cart. There are lots of guides explaining how to remove items completely from the cart but let's say I have an item in the cart with a quantity of 2 I just want to remove a quantity of 1 rather than the product itself.

Answer 1

Assuming you already have the item you want to change just do this:

$item->setQty(    $item->getQty() - $qtyToRemove);

if not you have to iterate throught the products in your cart, something like this should work:

foreach($cart->getQuote()->getAllVisibleItems() as $item)
{ 
     if $item->getProduct()->getId() == your_productid)
     {
        $item->setQty(    $item->getQty() - $qtyToRemove);
     }
}
$this->_cart->save();

let me knwo if you need any further assistance :)