code-metrics for ruby (on rails)

I'm searching for code analysing tools for Ruby (on Rails). I know
some tools for Java and DotNet but I can't seem to find much for Ruby.
Things I'm interested in are metrics like coupling (fan-in, fan-out),
complexity (McCabe), inheritance nesting levels etc.

The only tools I found so far are saikuro(only mccabe) and kwala
(seems like a frontend for saikuro)

If you know of any other tools please let me know,

Arjen

Yeah good luck with that.

If you find anything, post it back in here because I didn't see
anything.

Here's simple code statistics / metrics for Ruby (and some other common
languages JavaScript, C++, Java, ...)

Here's statistics of Rails modules
https://github.com/alexeypetrushin/code_stats/raw/master/docs/rails.png

The tool - CodeStats https://github.com/alexeypetrushin/code_stats

Attachments:
http://www.ruby-forum.com/attachment/6500/rails.png