rails/rails — comment on commit 0d3333257156544feba729ba28f6874d5a30d561
File:  line 0
By josevalim:

In general we keep the responder the same implementation as the scaffold. This allows us to say: replace respond_to by respond_with and everything will work exactly the same. If we want to change this on the responder, we should start a discussion on the mailing list or Campfire about changing scaffold to return the resource on update. Otherwise, you should be able to easily inherit from the the Rails responder and modify it to suit your application better.