Hello,

I really like the ability to do sums right in the object model, for
example

@items.sum(:unit_price), etc!  works great!

However I wonder how you step down through an association to do a sum

current_user.carts.first.cart_items.items.sum(:unit_price)

Finding the users first cart works fine but the collection to collection
between cart_items to items doesn't.

TIA

GP
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