Ruby on Rails

So this whole many-to-many thing has me really confused. I get how to set it up but I can't seem to find anywhere that really explains the best way to use it in your controller.

What I have:

Products, Orders, Orders_Products

The Products and Orders table has the standard stuff (Id, name, timestamps, etc)

The Orders_Products table has the two id columns (order_id, product_id) and a quantity column.

What I need to do:

Now when I save my "cart" how do you save a new order and each product with its quantity?

This is my first app in rails so the more explanation the better.

Thanks in advance for all the help!

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