class Rails::Railtie

def method_missing(name, *args, &block)

to the Railtie instance.
If the class method does not have a method, then send the method call

def method_missing(name, *args, &block)
  if !abstract_railtie? && instance.respond_to?(name)
    instance.public_send(name, *args, &block)
  else
    super
  end
end