ruby - How do I generate RDOC for (all of) Rails?

Question

I can do

sudo gem rdoc activerecord --no-ri

and

sudo gem rdoc actionpack --no-ri

both of which give me good docs.

But

sudo gem rdoc rails --no-ri

gives me pretty much nothing, as the Rails gem itself is really just a holder for the others. How can I generate the equivalent of http://api.rubyonrails.org/?

Answer 1

sudo gem rdoc --all --overwrite