ruby : dynamically bound values

gistfile1.rb

# evil Ruby dynamic variables

class DynamicValue
  attr_read :default_value
  
  def initialize(val)
    @default_value = val
  end

  def method_missing(name, *args)
    if tv=Thread.current['DynamicValue']
      tv.send( name, *args )
    else
      default_value.send( name, *args)
    end
  end

  def with_dynamic_value(value)
    tmp = Thread.current['DynamicValue']
    begin
      Thread.current['DynamicValue'] = value
      yield
    ensure
      Thread.current['DynamicValue'] = tmp
    end
  end

end

ActionController::Routing.const_set("Routes", DynamicValue.new(ActionController::Routing::Routes))

new_routes = blahblah
ActionController::Routing::Routes.with_dynamic_value( new_routes ) do
  load "other_routes_file.rb"
  do_some_other_shit
end