rails - redirect back unless previous page was artist page

I'd like to redirect b开发者_JS百科ack to the previous page, UNLESS the previous page was my 'artist' controller's 'show' action.

So I guess it would look something like:

if *previous page was artist show*
  redirect_to [track.artist, track]
else
  redirect_to :back
end

My question is - how do I test if the previous page was my artist controller's show action..?

---

Perhaps request.referer is what you're looking for? Then you can say something like:

if request.referer == artist_url(track.artist)
  redirect_to [track.artist, track]
else
  redirect_to :back
end