I'd recommend to get some confidence with Ruby before moving to Rails. It's better to spend 2-3 months learning Ruby and then focus on learning Rails, than struggle with both right from the start.

When people say that you can learn only basics of Ruby in few days and then move to Rails, they are right, you can, but this way you will learn two things in parallel, and it's pretty exhausting. So this doubtfully will save you any time.