Problem running Mongrel with Rails3 and Ruby 1.9.2

Question

I am new to programming (previously only did html/css/design) trying to start learning RoR via the book Simply Rails 2. However I want to start with the most recent versions of Ruby(1.9.2) and Rails (3) so I am forced to get everything configured without the book. I have looked a lot via google and on stackoverflow. When I run rails server it automatically uses Webrick, but I want to be using Mongrel. I installed the prerelease Mongrel via gem install mongrel --pre and removed the previous version. I read that in order to get Mongrel to work with rails server I had to add gem 'mongrel' to the Gemfile, but I do not know which one I should be adding it to (I tried several but nothing changed). So I decided to look at mongrel documentation via git and learned about mongrel_rails start when I run that I get this:

C:\Ruby192\shovell>mongrel_rails start
** Starting Mongrel listening at 0.0.0.0:3000
** Starting Rails with development environment...
C:/Ruby192/lib/ruby/gems/1.9.1/gems/bundler-1.0.0.rc.6/lib/bundler/runtime.rb:27:in 'block in setup': You have already activated mongrel 1.2. 0.pre2, but your Gemfile requires mongrel 1.1.5. Consider using bundle exec. (Gem::LoadError)
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/bundler-1.0.0.rc.6/lib/bundler/spec_set.rb:12:in 'block in each'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/bundler-1.0.0.rc.6/lib/bundler/spec_set.rb:12:in 'each'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/bundler-1.0.0.rc.6/lib/bundler/spec_set.rb:12:in 'each'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/bundler-1.0.0.rc.6/lib/bundler/runtime.rb:17:in 'setup'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/bundler-1.0.0.rc.6/lib/bundler.rb:100:in 'setup'
from C:/Ruby192/shovell/config/boot.rb:8:in '<top (required)>'
from <internal:lib/rubygems/custom_require>:29:in 'require'
from <internal:lib/rubygems/custom_require>:29:in 'require'
from C:/Ruby192/shovell/config/application.rb:1:in '<top (required)>'
from <internal:lib/rubygems/custom_require>:29:in 'require'
from <internal:lib/rubygems/custom_require>:29:in 'require'
from C:/Ruby192/shovell/config/environment.rb:2:in '<top (required)>'
from <internal:lib/rubygems/custom_require>:29:in 'require'
from <internal:lib/rubygems/custom_require>:29:in 'require'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/mongrel-1.2.0.pre2-x86-mingw32/lib/mongrel/rails.rb:147:in 'rails'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/mongrel-1.2.0.pre2-x86-mingw32/bin/mongrel_rails:116:in 'block (2 levels) in run'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/mongrel-1.2.0.pre2-x86-mingw32/lib/mongrel/configurator.rb:149:in 'call'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/mongrel-1.2.0.pre2-x86-mingw32/lib/mongrel/configurator.rb:149:in 'listener'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/mongrel-1.2.0.pre2-x86-mingw32/bin/mongrel_rails:102:in 'block in run'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/mongrel-1.2.0.pre2-x86-mingw32/lib/mongrel/configurator.rb:50:in 'call'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/mongrel-1.2.0.pre2-x86-mingw32/lib/mongrel/configurator.rb:50:in 'initialize'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/mongrel-1.2.0.pre2-x86-mingw32/bin/mongrel_rails:86:in 'new'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/mongrel-1.2.0.pre2-x86-mingw32/bin/mongrel_rails:86:in 'run'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/mongrel-1.2.0.pre2-x86-mingw32/lib/mongrel/command.rb:210:in 'run'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/mongrel-1.2.0.pre2-x86-mingw32/bin/mongrel_rails:282:in '<top (required)>'
from C:/Ruby192/bin/mongrel_rails:19:in 'load'
from C:/Ruby192/bin/mongrel_rails:19:in '<main>'

My best guess is that C:/Ruby192/lib/ruby/gems/1.9.1/gems/bundler-1.0.0.rc.6/lib/bundler/runtime.rb:27:in 'block in setup': You have already activated mongrel 1.2. 0.pre2, but your Gemfile requires mongrel 1.1.5. Consider using bundle exec. is the key but I have not been able to solve it.

I would appreciate any help so that I can get on to actually learning the language!

EDIT: I was able to get past the abov issue thanks to @duddle but now I have another issue...I am getting this error:

C:\Ruby192\shovell>mongrel_rails start
** Starting Mongrel listening at 0.0.0.0:3000
** Starting Rails with development environment...
C:/Ruby192/lib/ruby/gems/1.9.1/gems/activesupport-3.0.0.rc2/lib/active_support/dependencies.rb:239:in 'req uire': no such file to load -- dispatcher (LoadError)
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/activesupport-3.0.0.rc2/lib/active_support/dependencies.r b:239:in 'block in require'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/activesupport-3.0.0.rc2/lib/active_support/dependencies.r b:225:in 'block in load_dependency'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/activesupport-3.0.0.rc2/lib/active_support/dependencies.r b:591:in 'new_constants_in'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/activesupport-3.0.0.rc2/lib/active_support/dependencies.r b:225:in 'load_dependency'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/activesupport-3.0.0.rc2/lib/active_support/dependencies.r b:239:in 'require'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/mongrel-1.2.0.pre2-x86-mingw32/lib/mongrel/rails.rb:148:i n 'rails'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/mongrel-1.2.0.pre2-x86-mingw32/bin/mongrel_rails:116:in ' block (2 levels) in run'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/mongrel-1.2.0.pre2-x86-mingw32/lib/mongrel/configurator.r b:149:in 'call'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/mongrel-1.2.0.pre2-x86-mingw32/lib/mongrel/configurator.r b:149:in 'listener'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/mongrel-1.2.0.pre2-x86-mingw32/bin/mongrel_rails:102:in ' block in run'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/mongrel-1.2.0.pre2-x86-mingw32/lib/mongrel/configurator.r b:50:in 'call'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/mongrel-1.2.0.pre2-x86-mingw32/lib/mongrel/configurator.r b:50:in 'initialize'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/mongrel-1.2.0.pre2-x86-mingw32/bin/mongrel_rails:86:in 'n ew'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/mongrel-1.2.0.pre2-x86-mingw32/bin/mongrel_rails:86:in 'r un'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/mongrel-1.2.0.pre2-x86-mingw32/lib/mongrel/command.rb:210 :in 'run'
from C:/Ruby192/lib/ruby/gems/1.9.1/gems/mongrel-1.2.0.pre2-x86-mingw32/bin/mongrel_rails:282:in ' <top (required)>'
from C:/Ruby192/bin/mongrel_rails:19:in 'load'
from C:/Ruby192/bin/mongrel_rails:19:in '<main>'

My best guess at this point (1am...very tired) is that I am missing a file or something is not named as it should be..maybe i need to use the :require action in my Gemfile..maybe I just need to sleep on it. Ha.

Again, thanks a ton @duddle for getting me past the first error! Any more help is greatly appreciated!

Answer 1

You have already activated mongrel 1.2. 0.pre2, but your Gemfile requires mongrel 1.1.5. Consider using bundle exec. is the key but I have not been able to solve it.

You were almost there!

gem 'mongrel', '>= 1.2.0.pre2'

The second parameter tells bundler to require a version equal to or greater than 1.2.0.pre2, which you have to use when using Ruby 1.9.2.

The Bundler page provides a nice reference on how to use the Gemfile: http://gembundler.com/gemfile.html