Your add_item subroutine adds the item to cart_ref using the item_id as a key, which means your cart can never contain more than one entry for any one item_id. I would probably use an arrayref rather than a hashref for cart_ref, so you can just push new items into the cart allowing more than one of a given item_id.

In reply to Re: Need duplicate item entries in shopping cart by jasonk
in thread Need duplicate item entries in shopping cart by b310

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