Songs on Rap Genius have paths like /lyrics/The-notorious-b-i-g-ft-mase-and-puff-daddy/Mo-money-mo-problems which are defined in routes.rb as:

map.song '/lyrics/:artist_slug/:title_slug', :controller => 'songs', :action => 'show'

When I want to generate such a path, I use song_url(:title_slug => song.title_slug, :artist_slug => song.artist_slug). However, I'd much prefer to be able to type song_url(some_song). Is there a way I can make this happen besides defining a helper like:

  def x_song_path(song)
    song_path(:title_slug => song.title_slug, :artist_slug => song.artist_slug)
  end