When you say a product can link to more than one order, then I assume you use an array to store the orders. Why not just creating an array of dictionaries, where in each dictionary you set the order, the number of products, and possibly other information. This way when you want to know how many products are in an order, just go serch for your order in the array of dictionaries and get it. This is just to clarify that you haven't to search for strange things. This is not performant - it's just to help you figure it out. -- Luca C. _______________________________________________
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