The general opinion in the Rails ecosystem seems to be that WebSockets don't solve any real problems and that they are a toy.
The only mentions of WebSockets I've seen from people invested in Rails are mostly made of people actually deriding them and passive-aggressively making fun of people that use them or want to (generally in a bunch with MongoDB, Hadoop, Cassandra or other modern big data tools that don't fall naturally in the Rails ecosystem).
But then again, it's not like they have an infinite amount of time to invest into everything and anything and they worked on SSE for Rails 4 on top of shitloads of additional goodies, patched a lot of security issues so overall I'm pretty happy as an end-user.
We don't do anything specific with WebSockets. ActionController::Live may be able to help you there, in theory, but I'm not incredibly educated on the subject, to be honest.
I think Rails is great, but this is one area where it's not a good choice.