How to read rdoc in Emacs

Question

I'm now using to read RDoc gem server command. But I want to read document in Emacs.

I found a emacs lisp for it called [yari][1], but it doesn't worked in my environment. I called a function yari and typed in the minibuffer yari: Array, but result was yari: Array[not matched].

I don't insist to use yari, it is ok if I can read rdoc in Emacs. Is there any way that is commonly used?

Answer 1

The most common reason for yari not working is that you probably installed your ruby and its gems without their docs. If you're using RVM you should do this:

rvm docs generate

Answer 2

This worked for me:

gem install rdoc-data
rdoc-data --install