How can I start my Ruby environment from scratch?

Question

I've been trying to upgrade my rails environment on my MacBook and I've messed something up, but I'm not sure what. Is it possible to completely remove RVM, Ruby and Rails and start from scratch? I'm quite confused at how this is all supposed to work.

I've currently got Ruby 1.8.7 and 1.9.2 installed via RVM. I had rails upgraded to 3.0.9 but it refuses to work now, citing some error with rake.

/Users/Moshe/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/site_ruby/1.9.1/rubygems/dependency.rb:247:in to_specs': Could not find rails (>= 0) amongst [rake-0.8.7, rake-0.8.7, rubygems-update-1.8.5] (Gem::LoadError) from /Users/Moshe/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/site_ruby/1.9.1/rubygems/dependency.rb:256:into_spec' from /Users/Moshe/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/site_ruby/1.9.1/rubygems.rb:1182:in gem' from /Users/Moshe/.rvm/rubies/ruby-1.9.2-p180/bin/rails:18:in'

What can I do to fix the situation? I'd like to revert to the version of ruby that came with my Mac.

(Edit: I'm on Snow Leopard 10.6.8)

Edit2:

I've now gotten rvm to run ruby 1.9.2 and rails 3.0.9 However, trying to boot the server using rails server returns the following:

AppMachineMobile:hello Moshe$ rails server

=> Booting WEBrick

=> Rails 3.0.9 application starting in development on http://0.0.0.0:3000

=> Call with -d to detach

=> Ctrl-C to shutdown server

Exiting

/Users/Moshe/Development/Ruby/hello/config/initializers/new_rails_defaults.rb:14: undefined method `generate_best_match=' for ActionDispatch::Routing:Module (NoMethodError)

from /Library/Ruby/Gems/1.8/gems/activesupport-3.0.9/lib/active_support/dependencies.rb:235:in `load'

from /Library/Ruby/Gems/1.8/gems/activesupport-3.0.9/lib/active_support/dependencies.rb:235:in `load'

from /Library/Ruby/Gems/1.8/gems/activesupport-3.0.9/lib/active_support/dependencies.rb:225:in `load_dependency'

from /Library/Ruby/Gems/1.8/gems/activesupport-3.0.9/lib/active_support/dependencies.rb:596:in `new_constants_in'

from /Library/Ruby/Gems/1.8/gems/activesupport-3.0.9/lib/active_support/dependencies.rb:225:in `load_dependency'

from /Library/Ruby/Gems/1.8/gems/activesupport-3.0.9/lib/active_support/dependencies.rb:235:in `load'

from /Library/Ruby/Gems/1.8/gems/railties-3.0.9/lib/rails/engine.rb:201

from /Library/Ruby/Gems/1.8/gems/railties-3.0.9/lib/rails/engine.rb:200:in `each'

from /Library/Ruby/Gems/1.8/gems/railties-3.0.9/lib/rails/engine.rb:200

from /Library/Ruby/Gems/1.8/gems/railties-3.0.9/lib/rails/initializable.rb:25:in `instance_exec'

from /Library/Ruby/Gems/1.8/gems/railties-3.0.9/lib/rails/initializable.rb:25:in `run'

from /Library/Ruby/Gems/1.8/gems/railties-3.0.9/lib/rails/initializable.rb:50:in `run_initializers'

from /Library/Ruby/Gems/1.8/gems/railties-3.0.9/lib/rails/initializable.rb:49:in `each'

from /Library/Ruby/Gems/1.8/gems/railties-3.0.9/lib/rails/initializable.rb:49:in `run_initializers'

from /Library/Ruby/Gems/1.8/gems/railties-3.0.9/lib/rails/application.rb:134:in `initialize!'

from /Library/Ruby/Gems/1.8/gems/railties-3.0.9/lib/rails/application.rb:77:in `send'

from /Library/Ruby/Gems/1.8/gems/railties-3.0.9/lib/rails/application.rb:77:in `method_missing'

from /Users/Moshe/Development/Ruby/hello/config/environment.rb:5

from /Users/Moshe/Development/Ruby/hello/config.ru:3:in `require'

from /Users/Moshe/Development/Ruby/hello/config.ru:3

from /Library/Ruby/Gems/1.8/gems/rack-1.2.3/lib/rack/builder.rb:46:in `instance_eval'

from /Library/Ruby/Gems/1.8/gems/rack-1.2.3/lib/rack/builder.rb:46:in `initialize'

from /Users/Moshe/Development/Ruby/hello/config.ru:1:in `new'

from /Users/Moshe/Development/Ruby/hello/config.ru:1

Answer 1

I would try to start from scratch. Check which rvms you have installed:

$rvm list

and you should get something like this:

rvm rubies

   jruby-1.5.5 [ x86_64-java ]
   ree-1.8.7-2010.02 [ x86_64 ]
   ruby-1.8.6-p399 [ x86_64 ]
   ruby-1.8.7-p299 [ x86_64 ]
=> ruby-1.8.7-p302 [ x86_64 ]
   ruby-1.9.2-p0 [ x86_64 ]

Do a rvm uninstall on each piece:

$rvm uninstall 1.8.7
$rvm uninstall 1.9.2

Install Ruby 1.8.7:

$ rvm install 1.8.7

Install latest Ruby 1.9.2:

$ rvm install 1.9.2

Set your default (or 1.8.7 if u want that):

$ rvm use 1.9.2 --default

Install PostgreSQL and SQLite gems (assume snow leopard):

$ env ARCHFLAGS="-arch x86_64" gem install pg sqlite3-ruby

Install Rails 3 (includes Bundler):

$ gem install rails

If you are in a rails 2x project:

$rvm use 1.8.7

If you are in a rails 3 project:

$rvm use 1.9.2

When you are in each rvm, load the gems associated to the project via 'bundle install' if you are using bundler, or 'rake gems:install' if you have everything dumped into your environment.rb