Editing out ruby from ruby-on-rails is basically equivalent to editing out c# (or vb.net) from asp.net questions (containing code in the relevant language).
In short... it's a stupid idea.
Please reject such edits as vandalism / non-improvement.
A question concerning RoR code can be reviewed by ruby people, whether they know RoR or not. It's just that RoR people may have better insight into the framework. In the end it's still ruby code and should be tagged accordingly