Ask HN: How to use garb gem (Google Analytics with Ruby on Rails)?

I'm a RoR newbie and like to fetch some data from the google analytics api (https://developers.google.com/analytics/devguides/config/mgmt/v3/) with ruby on rails and the garb gem. You can find the garb gem here: https://github.com/Sija/garb

I struggle at the very beginning, because I don't know things like this:

- should I make a ressource for "authentication", "user", "report"? - what should I fill inside the controller and what comes inside the model?

The description of this gem on Github is not so detailed for a beginner. Most advanced programmers may use this easy but for me it (the description) says nothing...

Does anyone has a little sample app with this gem? Or does anyone can help me the get some basic data from the google analytics api with RoR?

KR, Fabian