Ruby Gem or Rails plugin -

I am writing a gem for which rail is needed as a dependency (red methods such as underscores, camisias and for other.

Is the gem still a gem or is it something else (Rail Plugins?) Because I have a rail dependency?

You do not have to rely solely on the tracks (in fact if this is actually a standalone gem , Then I would recommend that you do not do this) you can rely on portions of it that provide the necessary functionality for you, in this case you are talking.