Tidy up framework initialization code to ensure that it doesn't add folders to the load path that it doesn't intend to require.

Work around mongrel swallowing LoadErrors to ensure that users get more helpful errors if active_resource is required but not missing.  [mislav] Closes #9743


git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@7738 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

railties/lib/initializer.rb

@@ -152,6 +152,9 @@ module Rails
     # ActionPack, ActionMailer, and ActiveResource) are loaded.
     def require_frameworks
       configuration.frameworks.each { |framework| require(framework.to_s) }
+    rescue LoadError => e
+      # re-raise because Mongrel would swallow it
+      raise e.to_s
     end
 
     # Add the load paths used by support functions such as the info controller
@@ -545,16 +548,14 @@ module Rails
     end
 
     def framework_paths
-      # TODO: Don't include dirs for frameworks that are not used
-      %w(
-        railties
-        railties/lib
-        actionpack/lib
-        activesupport/lib
-        activerecord/lib
-        activeresource/lib
-        actionmailer/lib
-      ).map { |dir| "#{framework_root_path}/#{dir}" }.select { |dir| File.directory?(dir) }
+      paths = %w(railties railties/lib activesupport/lib)
+      paths << 'actionpack/lib' if frameworks.include? :action_controller or frameworks.include? :action_view
+      
+      [:active_record, :action_mailer, :active_resource, :action_web_service].each do |framework|
+        paths << "#{framework.to_s.gsub('_', '')}/lib" if frameworks.include? framework
+      end
+      
+      paths.map { |dir| "#{framework_root_path}/#{dir}" }.select { |dir| File.directory?(dir) }
     end
 
     private

railties/test/initializer_test.rb

@@ -82,3 +82,56 @@ class Initializer_after_initialize_with_no_block_environment_Test < Test::Unit::
   end
 
 end
+
+uses_mocha 'framework paths' do
+  class ConfigurationFrameworkPathsTests < Test::Unit::TestCase
+    def setup
+      @config = Rails::Configuration.new
+      @config.frameworks.clear
+      
+      File.stubs(:directory?).returns(true)
+      @config.stubs(:framework_root_path).returns('')
+    end
+
+    def test_minimal
+      expected = %w(
+        /railties
+        /railties/lib
+        /activesupport/lib
+      )
+      assert_equal expected, @config.framework_paths
+    end
+
+    def test_actioncontroller_or_actionview_add_actionpack
+      @config.frameworks << :action_controller
+      assert_framework_path '/actionpack/lib'
+      
+      @config.frameworks = [:action_view]
+      assert_framework_path '/actionpack/lib'
+    end
+
+    def test_paths_for_ar_ares_and_mailer
+      [:active_record, :action_mailer, :active_resource, :action_web_service].each do |framework|
+        @config.frameworks = [framework]
+        assert_framework_path "/#{framework.to_s.gsub('_', '')}/lib"
+      end
+    end
+
+    def test_unknown_framework_raises_error
+      @config.frameworks << :action_foo
+      initializer = Rails::Initializer.new @config
+      initializer.expects(:require).raises(LoadError)
+
+      assert_raise RuntimeError do
+        initializer.send :require_frameworks
+      end
+    end
+
+    protected
+
+      def assert_framework_path(path)
+        assert @config.framework_paths.include?(path),
+          "<#{path.inspect}> not found among <#{@config.framework_paths.inspect}>"
+      end
+  end
+end