Ensure that CDN path is emitted with built assets

app/helpers/requirejs_helper.rb

@@ -54,7 +54,10 @@ def requirejs_include_tag(name=nil, &block)
           paths = {}
           modules.each { |m| paths[m] = _javascript_path(m).sub /\.js$/,'' }
 
-          # Override uesr paths, whose mappings are only relevant in dev mode
+          # Add paths for assets specified by full URL (on a CDN)
+          run_config['paths'].each { |k,v| paths[k] = v if v =~ /^https?:/ }
+
+          # Override user paths, whose mappings are only relevant in dev mode
           # and in the build_config.
           run_config['paths'] = paths
         end

lib/requirejs/rails/config.rb

@@ -114,7 +114,7 @@ def build_config
     end
 
     def run_config
-      unless self.has_key(:run_config)
+      unless self.has_key?(:run_config)
         self[:run_config] = { "baseUrl" => "/assets" }
         self[:run_config].merge!(self.user_config).slice!(*self.run_config_whitelist)
       end

test/requirejs-rails_test.rb

@@ -51,7 +51,7 @@ def setup
 
   test "user_config should reject baseUrl" do
     exc = assert_raises Requirejs::ConfigError do
-      @cfg.user_config = { "baseUrl" => "/frobnitz" }
+      @cfg.user_config = { 'baseUrl' => '/frobnitz' }
     end
     assert_match /baseUrl is not needed/, exc.message
   end
@@ -63,6 +63,11 @@ def setup
     assert_equal 'lib/jquery-1.7.2.min', @cfg.run_config['paths']['jquery']
   end
 
+  test "run_config should allow settings to be overridden" do
+    @cfg.run_config['baseUrl'] = 'http://cdn.example.com/assets'
+    assert_equal 'http://cdn.example.com/assets', @cfg.run_config['baseUrl']
+  end
+
   test "build_config should inherit user_config settings" do
     @cfg.user_config = { 'paths' => { 'jquery' => 'lib/jquery-1.7.2.min' } }
     refute_nil @cfg.build_config['paths']
@@ -121,6 +126,10 @@ class RequirejsHelperTest < ActionView::TestCase
 
   def setup
     controller.requirejs_included = false
+    Rails.application.config.requirejs.user_config = { 'paths' => 
+      { 'jquery' => 'http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js' }
+    }
+
   end
 
   def wrap(tag)
@@ -153,4 +162,20 @@ def wrap(tag)
       render :text => "#{requirejs_include_tag}\n#{requirejs_include_tag}"
     end
   end
+
+  test "requirejs_include_tag with CDN asset in paths" do
+    render :text => wrap(requirejs_include_tag)
+    assert_select "script:first-of-type", :text => %r{var require =.*paths.*http://ajax}
+  end
+
+  test "requirejs_include_tag with CDN asset and digested asset paths" do
+    begin
+      saved_digest = Rails.application.config.assets.digest
+      Rails.application.config.assets.digest = true
+      render :text => wrap(requirejs_include_tag)
+      assert_select "script:first-of-type", :text => %r{var require =.*paths.*http://ajax}
+    ensure
+      Rails.application.config.assets.digest = saved_digest
+    end
+  end
 end