Add support for bare ActiveSupport via config.active_support.bare

railties/lib/rails.rb

 require "pathname"
 
+require 'active_support'
+require 'active_support/core_ext/kernel/reporting'
+require 'active_support/core_ext/logger'
+
 require 'rails/initializable'
 require 'rails/application'
 require 'rails/railties_path'

railties/lib/rails/application.rb

@@ -93,18 +93,8 @@ def call(env)
     # list. By default, all frameworks (Active Record, Active Support,
     # Action Pack, Action Mailer, and Active Resource) are loaded.
     initializer :require_frameworks do
-      begin
-        require 'active_support'
-        require 'active_support/core_ext/kernel/reporting'
-        require 'active_support/core_ext/logger'
-
-        # TODO: This is here to make Sam Ruby's tests pass. Needs discussion.
-        require 'active_support/core_ext/numeric/bytes'
-        config.frameworks.each { |framework| require(framework.to_s) }
-      rescue LoadError => e
-        # Re-raise as RuntimeError because Mongrel would swallow LoadError.
-        raise e.to_s
-      end
+      require 'active_support/all' unless config.active_support.bare
+      config.frameworks.each { |framework| require(framework.to_s) }
     end
 
     # Set the paths from which Rails will automatically load source files, and
@@ -308,9 +298,6 @@ def call(env)
           base_class.send("#{setting}=", value)
         end
       end
-      config.active_support.each do |setting, value|
-        ActiveSupport.send("#{setting}=", value)
-      end
     end
 
     # Sets +ActionController::Base#view_paths+ and +ActionMailer::Base#template_root+

railties/test/application/configuration_test.rb

@@ -44,5 +44,14 @@ def setup
         assert_equal Pathname.new("#{app_path}/app"), Rails.application.root
       end
     end
+
+    test "config.active_support.bare does not require all of ActiveSupport" do
+      add_to_config "config.frameworks = []; config.active_support.bare = true"
+
+      Dir.chdir("#{app_path}/app") do
+        require "#{app_path}/config/environment"
+        assert_raises(NoMethodError, /day/) { 1.day }
+      end
+    end
   end
 end
\ No newline at end of file

railties/test/application/initializer_test.rb

@@ -25,7 +25,9 @@ def setup
         config.frameworks << :action_foo
       end
 
-      assert_raises RuntimeError do
+      require "active_support/core_ext/load_error"
+
+      assert_raises MissingSourceFile do
         Rails.initialize!
       end
     end