keep track of the user who revised a post

lib/post_revisor.rb

@@ -12,6 +12,7 @@ class PostRevisor
     return false if not should_revise?
 
     @post.acting_user = @user
+    @post.updated_by = @user
     revise_post
     update_category_description
     post_process_post

spec/components/post_revisor_spec.rb

@@ -197,6 +197,11 @@ describe PostRevisor do
       it "allows an admin to insert images into a new user's post" do
         post.errors.should be_blank
       end
+
+      it "marks the admin as the last updater" do
+        post.updated_by.should == changed_by
+      end
+
     end
 
     describe "new user editing their own post" do