scope_key_by_partial fix for Ruby 1.9 when there's virtual_path

[#4202 state:committed]

Signed-off-by: Jeremy Kemper <jeremy@bitsweat.net>

actionpack/lib/action_view/helpers/translation_helper.rb

@@ -29,8 +29,9 @@ def localize(*args)
 
       private
         def scope_key_by_partial(key)
-          if (key.respond_to?(:join) ? key.join : key.to_s).first == "."
-            template.path_without_format_and_extension.gsub(%r{/_?}, ".") + key.to_s
+          strkey = key.respond_to?(:join) ? key.join : key.to_s
+          if strkey.first == "."
+            template.path_without_format_and_extension.gsub(%r{/_?}, ".") + strkey
           else
             key
           end

actionpack/test/fixtures/test/scoped_array_translation.erb

@@ -0,0 +1 @@
+<%= t(['.foo', '.bar']) %>

actionpack/test/template/translation_helper_test.rb

@@ -41,4 +41,10 @@ def test_scoping_by_partial
     I18n.expects(:translate).with("people.index.foo", :locale => 'en', :raise => true).returns("")
     translate ".foo", :locale => 'en'
   end
+
+  def test_scoping_by_partial_of_an_array
+    I18n.expects(:translate).with("test.scoped_array_translation.foo.bar", :raise => true).returns(["foo", "bar"])
+    @view = ActionView::Base.new(ActionController::Base.view_paths, {})
+    assert_equal "foobar", @view.render(:file => "test/scoped_array_translation")
+  end
 end