Untested Code Part 3: Refactoring 1

Now that we have tests, we can finally refactor! We'll do some minor cleaning on the structure of the controller action, and then extract some model logic into a new model method. During the process, we'll disentangle the book-finding logic from the book-adding logic. This will allow us to extract the book finding logic in part 4, reducing the controller to very little code.

<% unless Rails.env.test? %> <% end %>