使用调用Amazon API的方法进行动态更新

I am a beginner in Rails, but I have done a lot of searching on this and can't seem to find something to help me since I am having difficulty breaking down the problem. I have built a working method that requests information about a book given the ISBN from Amazon and would now like to use it to autofill information about the book after a user enters in the ISBN into a form. Here is my method (which is in my listing.rb model file):I am a beginner in Rails, but I have done a lot