There is code. It's used on BBC Programmes.
I think they open sourced it, but it's only released as a tarball, and I can't find it at the moment.
Code-wise it's a bit of a stretch to say it's Ruby on Rails in Perl. It was written by programmers who use and like (and I think pefer) Ruby and RoR, who had to use a very limited Perl environment. As such it's very much inspired by RoR but it's lacking a lot of features (no ActiveRecord for example).