1 files changed, 48 insertions, 0 deletions
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