ERROR: 'rake/rdoctask' is obsolete and no longer supported. Use 'rdoc/task' (available in RDoc 2.4.2+) instead

Question

Seems the last post for this problem was closed for one reason or another so I\'ll try my luck...

I\'m trying to run a simple \"rake db:migrate\" command. When I do,

Answer 1

I run into this whenever I have a Bundler-based project and I'm using Ruby 1.9.2. Eventually I figure out that Bundler isn't managing the rdoc gem, and all I have to do to fix the problem is include rdoc in the Gemfile (or the gemspec if Gemfile is already configured to use it) and run bundle install.

I never seem to run into this with 1.9.3 or 2.0.0, only 1.9.2.