How to require Rake >= 0.9 with Ruby >= 1.9

Very simple problem, judging by this title.

• I have Ruby 1.9.2
• I installed Rake 0.9.2.2 with RubyGems (gem install rake)
• I want to use Rake 0.9.2.2 in my Ruby environment (Rake 0.9.2.2 defines Rake::DSL module). How can I do ?

Simple answer (the one everyone is expecting to work):

require 'rake' # => true
Rake::DSL      # => NameError: uninitialized constant Rake::DSL

=> Wrong

The problem here is that Ruby 1.9 comes already with Rake 0.8.7 in its standard library, and require will always give priority to standard library over installed gems. So whatever Rake version you may install on your system, require 'rake' will always come up with version 0.8.7.

So basically, 2 solutions:

1. Force Rake version using RubyGems:

   gem 'rake', '0.9.2.2' # => true
   require 'rake'        # => true
   Rake::DSL             # => Rake::DSL
   

2. Include a rb file present in Rake 0.9.2.2 and unknown to 0.8.7, before requiring rake:

   require 'rake/dsl_definition' # => true
   require 'rake'                # => true
   Rake::DSL                     # => Rake::DSL
   

Hope this helps !