Implemented bundler. No more confusiong with gem versions!

config/boot.rb

@@ -106,5 +106,20 @@ module Rails
   end
 end
 
+# Bundler requirements
+class Rails::Boot
+  def run
+    load_initializer
+
+    Rails::Initializer.class_eval do
+      def load_gems
+        @bundler_loaded ||= Bundler.require :default, Rails.env
+      end
+    end
+
+    Rails::Initializer.run(:set_load_path)
+  end
+end
+
 # All that for this:
 Rails.boot!

config/environment.rb

@@ -55,13 +55,13 @@ Rails::Initializer.run do |config|
   # config.gem "sqlite3-ruby", :lib => "sqlite3"
   # config.gem "aws-s3", :lib => "aws/s3"
   #
-  # library for parsing/writing files from/to csv-file
-  config.gem "fastercsv"
-  config.gem "prawn", :version => '<=0.6.3'
-  config.gem "haml", :version => '>=2.0.6'
-  config.gem "routing-filter", :lib => "routing_filter"
+  #  config.gem "fastercsv"
+  #  config.gem "prawn", :version => '<=0.6.3'
+  #  config.gem "haml", :version => '>=2.0.6'
+  #  config.gem "routing-filter", :lib => "routing_filter"
 
   # The internationalization framework can be changed to have another default locale (standard is :en) or more load paths.
+  # library for parsing/writing files from/to csv-file
   # All files from config/locales/*.rb,yml are added automatically.
   # config.i18n.load_path << Dir[File.join(RAILS_ROOT, 'my', 'locales', '*.{rb,yml}')]
   config.i18n.default_locale = :de

config/preinitializer.rb

@@ -0,0 +1,20 @@
+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