ActionDispatch::Routing::RouteSet::Generator#initialize_with_baby_unicorn_killer

route_set.rb

# this is a hack to get the subdomain part of routing working
# I added it in for Rails 3.0.1
module ActionDispatch
  module Routing
    class RouteSet
      class Generator
        alias_method :initialize_before, :initialize
        def initialize(options, recall, set, extras = false)
          initialize_before(options, recall, set, extras)
          @recall.delete(:subdomain)
        end
      end
    end
  end
end