Every time that I use rails.vim I wonder why there is no :Rroutes command. Is there a reason that it does not exist?
:Rinitializer goes there if the argument is omitted.
Hmmm, that's odd.
I'll grant you "odd", it makes sense when you think of config/routes.rb as the penultimate initializer. I don't want a one-off navigation command.
Also, you can create custom navigation commands. Rnavcommand routes config -glob= -default=routes.rb -suffix= would do the trick.
Rnavcommand routes config -glob= -default=routes.rb -suffix=
Here's a simpler implementation:
command Rroutes Rinitializer