Ensure AssetUrlHelper can be mixed into AC::Base

actionpack/lib/action_view/helpers/asset_url_helper.rb

@@ -135,8 +135,7 @@ module ActionView
           source = compute_asset_path(source, options)
         end
 
-        current_request = controller.request if controller.respond_to?(:request)
+        if relative_url_root = config.relative_url_root || asset_request.try(:script_name)
-        if relative_url_root = config.relative_url_root || current_request.try(:script_name)
           source = "#{relative_url_root}#{source}" unless source.starts_with?("#{relative_url_root}/")
         end
 
@@ -180,10 +179,7 @@ module ActionView
       # or the value returned from invoking call on an object responding to call
       # (proc or otherwise).
       def compute_asset_host(source = "", options = {})
-        if controller.respond_to?(:request)
+        request = asset_request
-          request = controller.request
-        end
-
         host = config.asset_host
         host ||= request.base_url if request && options[:protocol] == :request
         return unless host
@@ -342,6 +338,17 @@ module ActionView
         url_to_asset(source, type: :font)
       end
       alias_method :url_to_font, :font_url # aliased to avoid conflicts with an font_url named route
+
+      private
+        # Get current request if self is a controller. If self is a
+        # view, check the parent controller's request.
+        def asset_request
+          if respond_to?(:request)
+            request
+          elsif respond_to?(:controller) && controller.respond_to?(:request)
+            controller.request
+          end
+        end
     end
   end
 end

actionpack/test/template/asset_tag_helper_test.rb

@@ -13,6 +13,8 @@ end
 class AssetTagHelperTest < ActionView::TestCase
   tests ActionView::Helpers::AssetTagHelper
 
+  attr_reader :request
+
   def setup
     super
     silence_warnings do
@@ -598,6 +600,8 @@ end
 class AssetTagHelperNonVhostTest < ActionView::TestCase
   tests ActionView::Helpers::AssetTagHelper
 
+  attr_reader :request
+
   def setup
     super
     @controller = BasicController.new
@@ -720,3 +724,32 @@ class AssetTagHelperNonVhostTest < ActionView::TestCase
     assert_dom_equal(%(/collaboration/hieraki/stylesheets/foo.css), stylesheet_path("foo"))
   end
 end
+
+class AssetUrlHelperControllerTest < ActionView::TestCase
+  tests ActionView::Helpers::AssetUrlHelper
+
+  def setup
+    super
+
+    @controller = BasicController.new
+    @controller.extend ActionView::Helpers::AssetUrlHelper
+
+    @request = Class.new do
+      attr_accessor :script_name
+      def protocol() 'http://' end
+      def ssl?() false end
+      def host_with_port() 'www.example.com' end
+      def base_url() 'http://www.example.com' end
+    end.new
+
+    @controller.request = @request
+  end
+
+  def test_asset_path
+    assert_equal "/foo", @controller.asset_path("foo")
+  end
+
+  def test_asset_url
+    assert_equal "http://www.example.com/foo", @controller.asset_url("foo")
+  end
+end