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hi and welcome back in our last episode we created a database migration and added a price column to our purchases table and now were going to actually build that in so it shows up here on the site and actually is formatted properly so the very first thing that were going to do is come into the application and go into the controller so go out controller invoices because we have it nested and purchases now in purchases one of the things that we have to do is come all the way down the bottom and rails 4 has something thats new to the framework and its called strong parameters and what strong parameters mean is that we actually have to pass any parameters that get sent through the form through this strong parameter filter essentially and so what it does is it its a security measure and it means that nobody is allowed to pass any kind of form data in except what we permit right here so currently we have name category quantity and invoice ID so all we have to do is add price and now th