diff --git a/actionmailer/lib/action_mailer/base.rb b/actionmailer/lib/action_mailer/base.rb
index d647069fc7..48d6bbc8d9 100644
--- a/actionmailer/lib/action_mailer/base.rb
+++ b/actionmailer/lib/action_mailer/base.rb
@@ -267,7 +267,7 @@ module ActionMailer #:nodoc:
 
     include AbstractController::Logger
     include AbstractController::Rendering
-    include AbstractController::LocalizedCache
+    include AbstractController::DetailsCache
     include AbstractController::Layouts
     include AbstractController::Helpers
     include AbstractController::Translation
diff --git a/actionpack/lib/abstract_controller.rb b/actionpack/lib/abstract_controller.rb
index 1e15ab090c..1944e42ef1 100644
--- a/actionpack/lib/abstract_controller.rb
+++ b/actionpack/lib/abstract_controller.rb
@@ -13,9 +13,9 @@ module AbstractController
   autoload :Callbacks
   autoload :Collector
   autoload :Compatibility
+  autoload :DetailsCache
   autoload :Helpers
   autoload :Layouts
-  autoload :LocalizedCache
   autoload :Logger
   autoload :Rendering
   autoload :Translation
diff --git a/actionpack/lib/abstract_controller/details_cache.rb b/actionpack/lib/abstract_controller/details_cache.rb
new file mode 100644
index 0000000000..5b87b41e7d
--- /dev/null
+++ b/actionpack/lib/abstract_controller/details_cache.rb
@@ -0,0 +1,48 @@
+module AbstractController
+  class HashKey
+    @hash_keys = Hash.new {|h,k| h[k] = {} }
+
+    def self.get(klass, details)
+      @hash_keys[klass][details] ||= new(klass, details)
+    end
+
+    attr_reader :hash
+    alias_method :eql?, :equal?
+
+    def initialize(klass, details)
+      @details, @hash = details, details.hash
+    end
+
+    def inspect
+      "#<HashKey -- details: #{@details.inspect}>"
+    end
+  end
+
+  module DetailsCache
+    extend ActiveSupport::Concern
+
+    module ClassMethods
+      def clear_template_caches!
+        ActionView::Partials::PartialRenderer::TEMPLATES.clear
+        template_cache.clear
+        super
+      end
+
+      def template_cache
+        @template_cache ||= Hash.new {|h,k| h[k] = {} }
+      end
+    end
+
+    def render_to_body(*args)
+      Thread.current[:format_locale_key] = HashKey.get(self.class, _details_defaults)
+      super
+    end
+
+    private
+
+      def with_template_cache(name, details)
+        self.class.template_cache[HashKey.get(self.class, details)][name] ||= super
+      end
+
+  end
+end
diff --git a/actionpack/lib/abstract_controller/localized_cache.rb b/actionpack/lib/abstract_controller/localized_cache.rb
deleted file mode 100644
index 5e3efa002c..0000000000
--- a/actionpack/lib/abstract_controller/localized_cache.rb
+++ /dev/null
@@ -1,49 +0,0 @@
-module AbstractController
-  class HashKey
-    @hash_keys = Hash.new {|h,k| h[k] = Hash.new {|sh,sk| sh[sk] = {} } }
-
-    def self.get(klass, formats, locale)
-      @hash_keys[klass][formats][locale] ||= new(klass, formats, locale)
-    end
-
-    attr_accessor :hash
-    def initialize(klass, formats, locale)
-      @formats, @locale = formats, locale
-      @hash = [formats, locale].hash
-    end
-
-    alias_method :eql?, :equal?
-
-    def inspect
-      "#<HashKey -- formats: #{@formats.inspect} locale: #{@locale.inspect}>"
-    end
-  end
-
-  module LocalizedCache
-    extend ActiveSupport::Concern
-
-    module ClassMethods
-      def clear_template_caches!
-        ActionView::Partials::PartialRenderer::TEMPLATES.clear
-        template_cache.clear
-        super
-      end
-
-      def template_cache
-        @template_cache ||= Hash.new {|h,k| h[k] = {} }
-      end
-    end
-
-    def render(*args)
-      Thread.current[:format_locale_key] = HashKey.get(self.class, formats, I18n.locale)
-      super
-    end
-
-    private
-
-      def with_template_cache(name)
-        self.class.template_cache[Thread.current[:format_locale_key]][name] ||= super
-      end
-
-  end
-end
diff --git a/actionpack/lib/abstract_controller/rendering.rb b/actionpack/lib/abstract_controller/rendering.rb
index f5c20e8013..14f51ae1bf 100644
--- a/actionpack/lib/abstract_controller/rendering.rb
+++ b/actionpack/lib/abstract_controller/rendering.rb
@@ -165,13 +165,17 @@ module AbstractController
 
       details = _normalize_details(options)
 
-      options[:_template] ||= with_template_cache(name) do
+      options[:_template] ||= with_template_cache(name, details) do
         find_template(name, details, options)
       end
     end
 
+    def _details_defaults
+      { :formats => formats, :locale => [I18n.locale] }
+    end
+
     def _normalize_details(options)
-      details = { :formats => formats }
+      details = _details_defaults
       details[:formats] = Array(options[:format]) if options[:format]
       details[:locale]  = Array(options[:locale]) if options[:locale]
       details
@@ -185,7 +189,7 @@ module AbstractController
       view_paths.exists?(name, details, options[:_prefix], options[:_partial])
     end
 
-    def with_template_cache(name)
+    def with_template_cache(name, details)
       yield
     end
 
diff --git a/actionpack/lib/action_controller/metal/rendering.rb b/actionpack/lib/action_controller/metal/rendering.rb
index b90c054e98..a026289ee5 100644
--- a/actionpack/lib/action_controller/metal/rendering.rb
+++ b/actionpack/lib/action_controller/metal/rendering.rb
@@ -4,7 +4,7 @@ module ActionController
 
     include ActionController::RackDelegation
     include AbstractController::Rendering
-    include AbstractController::LocalizedCache
+    include AbstractController::DetailsCache
 
     def process_action(*)
       self.formats = request.formats.map {|x| x.to_sym }
diff --git a/actionpack/lib/action_view/base.rb b/actionpack/lib/action_view/base.rb
index 44e5870131..a61017ae11 100644
--- a/actionpack/lib/action_view/base.rb
+++ b/actionpack/lib/action_view/base.rb
@@ -196,7 +196,7 @@ module ActionView #:nodoc:
         # This is expensive, but we need to reset this when the format is updated,
         # which currently only happens
         Thread.current[:format_locale_key] =
-          AbstractController::HashKey.get(self.class, formats, I18n.locale)
+          AbstractController::HashKey.get(self.class, :formats => formats, :locale => [I18n.locale])
       end
     end
 
diff --git a/actionpack/test/abstract/localized_cache_test.rb b/actionpack/test/abstract/details_cache_test.rb
similarity index 96%
rename from actionpack/test/abstract/localized_cache_test.rb
rename to actionpack/test/abstract/details_cache_test.rb
index 8b0b0fff03..ee746c1bb0 100644
--- a/actionpack/test/abstract/localized_cache_test.rb
+++ b/actionpack/test/abstract/details_cache_test.rb
@@ -5,7 +5,7 @@ module AbstractController
   
     class CachedController < AbstractController::Base
       include AbstractController::Rendering
-      include AbstractController::LocalizedCache
+      include AbstractController::DetailsCache
 
       self.view_paths = [ActionView::FixtureResolver.new(
         "default.erb" => "With Default",