Focus on your main application rather than configuring it. Lot of times Rails is an overkill for a simple application and Sinatra seems like a perfect choice.
Create a bare minimum modularized Sinatra application using
gem install modularize_sinatra
create an application named
myapp with controller name
modularize_sinatra myapp -C user
Source Code and more usage instructions https://github.com/goyalankit/modularize_sinatra
oh! there's this blog post showing its simplicity: