Rails - bundler error when using thin

Question

I started using bundler and have some problems getting it working. I have the following gemfile:

source "http://rubygems.org"
gem "rack", "~>1.1"
gem 'pg','>= 0.8.0'
gem 'rails','2.3.8'
gem 'authlogic','2.1.3'
gem 'ajaxful_rating','2.2.3'
gem 'will_paginate','2.3.12'
gem 'right_aws','1.10.0'
gem 'aws-s3','0.6.2'
gem 'declarative_authorization','0.4.1'
gem 'timeline_fu','0.3.0'
gem 'friendly_id','>= 3.1'

Notice that I specificy that I want to use rack 1.1 (1.1.0).

I get the following error when I run with thin (Webrick works fine):

thin start
>> Using rails adapter
/usr/lib/ruby/gems/1.8/gems/bundler-1.0.3/lib/bundler/runtime.rb:27:in `setup': You have already activated rack 1.2.1, but your Gemfile requires rack 1.1.0. Consider using bundle exec. (Gem::LoadError)
 from /usr/lib/ruby/gems/1.8/gems/bundler-1.0.3/lib/bundler/spec_set.rb:12:in `each'
 from /usr/lib/ruby/gems/1.8/gems/bundler-1.0.3/lib/bundler/spec_set.rb:12:in `each'
 from /usr/lib/ruby/gems/1.8/gems/bundler-1.0.3/lib/bundler/runtime.rb:17:in `setup'
 from /usr/lib/ruby/gems/1.8/gems/bundler-1.0.3/lib/bundler.rb:100:in `setup'
 from /home/vmplanet/Documents/maga/config/../config/preinitializer.rb:16
 from /home/vmplanet/Documents/maga/config/boot.rb:28:in `load'
 from /home/vmplanet/Documents/maga/config/boot.rb:28:in `preinitialize'
 from /home/vmplanet/Documents/maga/config/boot.rb:10:in `boot!'
 from /home/vmplanet/Documents/maga/config/boot.rb:126
 from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
 from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
 from /home/vmplanet/Documents/maga/config/environment.rb:7
 from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
 from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
 from /home/vmplanet/.gem/ruby/1.8/gems/thin-1.2.7/lib/rack/adapter/rails.rb:42:in `load_application'
 from /home/vmplanet/.gem/ruby/1.8/gems/thin-1.2.7/lib/rack/adapter/rails.rb:23:in `initialize'
 from /home/vmplanet/.gem/ruby/1.8/gems/thin-1.2.7/lib/rack/adapter/loader.rb:48:in `new'
 from /home/vmplanet/.gem/ruby/1.8/gems/thin-1.2.7/lib/rack/adapter/loader.rb:48:in `for'
 from /home/vmplanet/.gem/ruby/1.8/gems/thin-1.2.7/lib/thin/controllers/controller.rb:163:in `load_adapter'
 from /home/vmplanet/.gem/ruby/1.8/gems/thin-1.2.7/lib/thin/controllers/controller.rb:67:in `start'
 from /home/vmplanet/.gem/ruby/1.8/gems/thin-1.2.7/lib/thin/runner.rb:177:in `send'
 from /home/vmplanet/.gem/ruby/1.8/gems/thin-1.2.7/lib/thin/runner.rb:177:in `run_command'
 from /home/vmplanet/.gem/ruby/1.8/gems/thin-1.2.7/lib/thin/runner.rb:143:in `run!'

So basically it is complaining that I am using rack 1.2.1 (which is not the case, I can't think of anything using it).

Any thoughts?

Answer 1

Thin itself depends on Rack. And because Thin will load itself before it loads your application, the most recent version of Rack will already be loaded when bundler first enters the picture.

You have to force the correct version of Rack to Thin. In theory you could only have Rack 1.1.0 in your system gems, but that's hardly maintainable or portable. The error message already contains the answer; use bundle exec.

bundle exec thin start