From ad049bcc4b8f6a30f244a0410e6cdd28eab003c5 Mon Sep 17 00:00:00 2001
From: Jacques Distler <distler@golem.ph.utexas.edu>
Date: Thu, 18 Dec 2008 09:21:26 -0600
Subject: [PATCH] Drop hostname from cache key

By default, Rails will cache

    example.com/mywiki/show/SomePage
and
    www.example.com/mywiki/show/SomePage

In Instiki, this just leads to stale cached pages and frustration.
Fix that behaviour.
---
 config/environment.rb |  1 +
 lib/caching_stuff.rb  | 20 ++++++++++++++++++++
 2 files changed, 21 insertions(+)
 create mode 100644 lib/caching_stuff.rb

diff --git a/config/environment.rb b/config/environment.rb
index 05bd8afc..4a3c41e0 100644
--- a/config/environment.rb
+++ b/config/environment.rb
@@ -58,3 +58,4 @@ end
 require_dependency 'instiki_errors'
 
 #require 'jcode'
+require 'caching_stuff'
diff --git a/lib/caching_stuff.rb b/lib/caching_stuff.rb
new file mode 100644
index 00000000..54634a47
--- /dev/null
+++ b/lib/caching_stuff.rb
@@ -0,0 +1,20 @@
+# based on http://pastie.org/49840
+# override the fragment_cache_key method in actionpack/lib/action_controller/caching/fragments.rb
+# to remove hostname in fragment caching
+# so instead of caching different fragments for "example.com/posts/list" and 
+# "www.example.com/posts/list", instead it will just use "posts/list"
+module CachingStuff
+  module ActionController
+    module Caching
+      module Fragments
+        def fragment_cache_key(key)
+          ActiveSupport::Cache.expand_cache_key(key.is_a?(Hash) ? url_for(key.merge(:host=>"")).split(":///").last : key.split('/')[1..-1].join('/'), :views)
+        end
+      end
+    end
+  end
+end
+
+ActionController::Base.class_eval do
+  include CachingStuff::ActionController::Caching::Fragments
+end