Why does my Ruby 'ri' tool not return results in command prompt?
rdoc, ri, ruby
Solution
Although this question is old, nobody has yet provided a proper solution. I just ran into the same issue, and found the solution:
If you are using RVM:
rvm docs generate-ri # <- Just the ri docs, much faster
rvm docs generate # <- Everything (rdoc + ri)
More info on managing RVM docs here: https://rvm.io/rubies/docs
If not using RVM:
gem install rdoc-data
# Regenerate system docs
rdoc-data --install
# Regenerate all gem docs (rdoc + ri)
gem rdoc --all --overwrite
# Regenerate all gem docs (ri only)
gem rdoc --all --overwrite --ri --no-rdoc
# Regenerate specific gem doc with specific version
gem rdoc gemname -v 1.2.3 --overwrite
Problem
Possible Duplicate: ruby 1.9 ri problem When I try to use Ruby's `ri` tool in a command prompt window to get help about classes, methods, etc. it seems to always fail. For example if I type: ``` ri Array ``` I get a message saying: ``` Updating class cache with 0 classes... Nothing known about Array ``` I am using Vista 64 with Ruby 1.9.1p243 (2009-07-16 revision 24175) [i386-mingw32] installed. What should I do to configure `ri` to work?