For those wondering what the alternatives to Rails are these days, I highly recommend checking out Elixir and the Phoenix framework.
Pros: websocket support is good, the developers are friendly and answer questions, the app is faster than what I'm used to with Rails.
Neutral: Elixir looks like Ruby but it's very different. Be prepared to learn everything from scratch. You need also to know a little Erlang and the OTP framework to be able to use some useful library functions. OTP is a world on its own.
Cons: the tooling is very immature, probably like the one for Rails at the time of the 1.x releases. Be prepared to write many things by hand instead of requiring gem_x and automagically get functionality for free. This is going to slow down developement, increase costs and possibly get you outbid from competitors. Nevertheless it could be OK for internal projects used to get familiar with the framework.