app.rb

class Kalifornium < Padrino::Application
def load_something
    @a = 1; @b = 2
  end
end

gistfile3.txt

NameError at /rooms/new
undefined local variable or method `load_something' for #<Kalifornium:0x00000004fe8c68>

rooms.rb

Kalifornium.controllers :rooms do

get :new do
      load_something
      [@a.inspect, @b.inspect].join(" - ")

      @room = Room.new
      @title = "ADMIN: Inserisci una nuova stanza"
      #render "rooms/new"
    end

end