Expire pages that want file, when file is successfully uploaded

Reported by Andrew Stacey

app/controllers/file_controller.rb

@@ -18,6 +18,9 @@ class FileController < ApplicationController
       new_file = @web.wiki_files.create(params['file'])
       if new_file.valid?
         flash[:info] = "File '#{@file_name}' successfully uploaded"
+        WikiReference.pages_that_want_file(@web, @file_name).each do |page|
+          RevisionSweeper.expire_page(page)
+        end
         redirect_to(params['referring_page'])
       else
         # pass the file with errors back into the form

app/controllers/revision_sweeper.rb

@@ -25,6 +25,10 @@ class RevisionSweeper < ActionController::Caching::Sweeper
     end
   end
   
+  def self.expire_page(page)
+    new.expire_caches(page)
+  end
+
   private
   
   def expire_caches(page)