[Radiant] Running Radiant without config.gem in the environment.rb file

[Wes Gamble]

All,

This is really bundler stuff, but if you want to use bundler to manage 
gem dependencies (a la Rails 3) instead of using config.gem commands in 
environment.rb, here's how you do it:

1) Generate your Gemfile in Rails.root as normal and use bundle install 
and bundle update to manage your gems
2) Add a file named "preinitializer.rb" to Rails.root/config with the 
following content:

begin
  require "rubygems"
  require "bundler"
rescue LoadError
  raise "Could not load the bundler gem. Install it with `gem install 
bundler`."
end

if Gem::Version.new(Bundler::VERSION) <= Gem::Version.new("0.9.24")
  raise RuntimeError, "Your bundler version is too old for Rails 2.3." +
   "Run `gem install bundler` to upgrade."
end

begin
  # Set up load paths for all bundled gems
  ENV["BUNDLE_GEMFILE"] = File.expand_path("../../Gemfile", __FILE__)
  Bundler.setup
rescue Bundler::GemNotFound
  raise RuntimeError, "Bundler couldn't find some gems." +
    "Did you run `bundle install`?"
end

This will allow you to remove all of the config.gem entries from 
environment.rb and make it slightly easier to upgrade to Rails 3 someday.

Thanks,
Wes