If you want to learn RoR, it's important having a solid base for easy understanding. Michael Hartl (the creator of the famous Rails Tutorial book) is writing a new series of book for complete beginners. In his words this byte size books will give you the foundation you need to start programming and understand better his Rails book. I read the first one: **Learn Enough Command Line to Be Dangerous** and its really good, I recommend to everyone (even intermediate and advanced programmers).
You can find the second book and the roadmap for the next ones [here](http://www.learnenough.com).