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I was successful in reaching page 184 in the book "Agile Web Development with Rails" 3rd edition and while running the website with PostGreSQL as the backend, the power went down. The PostGreSQL database contents look OK and so do the source code files I was editing. But whenever I click on any "Add To Cart" button in the catalog, I get the following information in the

I''ve completed the chapter on Internationalization successfully, but found out just recently that the "Who Bought" function produces an error page that looks very ugly when someone enters a product ID that does not exist. My preference would be to design the app to have a list of hyperlinks presented when you visit the URL, http://localhost:3000/info/ that describes the list of