The chances you will become a Jr. ROR developer are really high. The question is, what do you want to do with it?

ROR is a great entry into coding, and building applications, however Rails is really abstracted away from Ruby. You will eventually (likely) need to dig into Ruby, but that's completely fine. You can build a lot with Rails, and it's a lot of fun. I sometimes recommend ROR before digging into JS or a different language but that might just be me.

Best of luck.