When looking at the cart from code (for example in the checkout_cart_save_after event), how do I tell which items are part of bundles and which are not?
For example, lets say I have a bundle which is a pack of 4 shirts together with a discount, and those same shirts can also be purchased separately, as simple products.
Now a user added this bundle to cart + 2 of those shirts without any bundle. If I look at the products in cart, by using something like this:
I will get a total of 7 items - the bundle product, and 6 shirts.
How can I tell which of the shirts are part of the bundle and which were bought separately?