diff --git a/actionpack/lib/action_controller/record_identifier.rb b/actionpack/lib/action_controller/record_identifier.rb
index 77fe5cbe2a8c6..f69c3d6163e7f 100644
--- a/actionpack/lib/action_controller/record_identifier.rb
+++ b/actionpack/lib/action_controller/record_identifier.rb
@@ -1,19 +1,3 @@
-class Class
-  def model_name
-    @model_name ||= ModelName.new(name)
-  end
-
-  class ModelName
-    attr_reader :singular, :plural, :path
-
-    def initialize(name)
-      @singular = name.underscore.tr('/', '_').freeze
-      @plural = @singular.pluralize.freeze
-      @path = "#{name.tableize}/#{name.demodulize.underscore}".freeze
-    end
-  end
-end
-
 module ActionController  
   # The record identifier encapsulates a number of naming conventions for dealing with records, like Active Records or 
   # Active Resources or pretty much any other model type that has an id. These patterns are then used to try elevate
@@ -59,9 +43,9 @@ def partial_path(record_or_class, controller_path = nil)
       name = model_name_from_record_or_class(record_or_class)
 
       if controller_path && controller_path.include?("/")
-        "#{File.dirname(controller_path)}/#{name.path}"
+        "#{File.dirname(controller_path)}/#{name.partial_path}"
       else
-        name.path
+        name.partial_path
       end
     end
 
diff --git a/activesupport/lib/active_support/core_ext/module.rb b/activesupport/lib/active_support/core_ext/module.rb
index da8d5b376291c..34fcbd124bb54 100644
--- a/activesupport/lib/active_support/core_ext/module.rb
+++ b/activesupport/lib/active_support/core_ext/module.rb
@@ -6,3 +6,8 @@
 require 'active_support/core_ext/module/introspection'
 require 'active_support/core_ext/module/loading'
 require 'active_support/core_ext/module/aliasing'
+require 'active_support/core_ext/module/model_naming'
+
+class Module
+  include ActiveSupport::CoreExt::Module::ModelNaming
+end
diff --git a/activesupport/lib/active_support/core_ext/module/model_naming.rb b/activesupport/lib/active_support/core_ext/module/model_naming.rb
new file mode 100644
index 0000000000000..26e76ab556755
--- /dev/null
+++ b/activesupport/lib/active_support/core_ext/module/model_naming.rb
@@ -0,0 +1,22 @@
+module ActiveSupport
+  class ModelName < String
+    attr_reader :singular, :plural, :partial_path
+
+    def initialize(name)
+      super
+      @singular = underscore.tr('/', '_').freeze
+      @plural = @singular.pluralize.freeze
+      @partial_path = "#{tableize}/#{demodulize.underscore}".freeze
+    end
+  end
+
+  module CoreExt
+    module Module
+      module ModelNaming
+        def model_name
+          @model_name ||= ModelName.new(name)
+        end
+      end
+    end
+  end
+end
diff --git a/activesupport/test/core_ext/module/model_naming_test.rb b/activesupport/test/core_ext/module/model_naming_test.rb
new file mode 100644
index 0000000000000..fc73fa5c36ddc
--- /dev/null
+++ b/activesupport/test/core_ext/module/model_naming_test.rb
@@ -0,0 +1,19 @@
+require 'abstract_unit'
+
+class ModelNamingTest < Test::Unit::TestCase
+  def setup
+    @name = ActiveSupport::ModelName.new('Post::TrackBack')
+  end
+
+  def test_singular
+    assert_equal 'post_track_back', @name.singular
+  end
+
+  def test_plural
+    assert_equal 'post_track_backs', @name.plural
+  end
+
+  def test_partial_path
+    assert_equal 'post/track_backs/track_back', @name.partial_path
+  end
+end