include url_helpers

call_from_url_helpers.rb

class Foo
  def do_something
    ...
    Rails.application.routes.url_helpers.my_awesome_routing_path
    Rails.application.routes.url_helpers.my_awesome_routing_url(:host => 'http://your-domain.com')
    ...
  end
end

include_url_helpers.rb

class Foo
  include Rails.application.routes.url_helpers

  def do_something
    ...
    my_awesome_routing_path
    my_awesome_routing_url(:host => 'http://your-domain.com')
    ...
  end
end