Rails - Feb 2012 - Implementing a history feature for a basic wiki app maybe papertrails ?

I have been trying a lot for the last two days to implement a history
feature for my basic wiki rails app. I am using papertrails for that.
But according to my below code, whenever i click undo. it reverts back
to the first edit instead of the last edit. does that means its not
storing the last edit ? Any help please ?

pages_helper

    module PagesHelper

    def undo_link

       link_to("undo",
revert_version_path(@page.versions.last.reify ), :method => :post)
      end
    end

pages_controller

      def revert
        @version = Version.find(params[:id])
        if @version.reify
          @version.reify.save!
        else
          @version.item.destroy
        end

        link_name = params[:redo] == "true" ? "undo" :
"redo"
      link = view_context.link_to(link_name,
revert_version_path(@version.next, :redo => !params[:redo]), :method
=> :post)
      redirect_to :back, :notice => "Undid #{@version.event}.
#{link}"
      end

pages show.html.erb


    <tbody>
                                <% @page.versions.reverse.each do |
version|  %>
                                <tr class="odd">
                                  <td><input type="checkbox"
/></td>
                                  <td><%=  %></td>
                                  <td><%=
version.created_at%></td>
                                  <td><%= undo_link %></td>
                                  <td><%version.update_attributes
:summary => ''version'' %></td>
                                </tr>


                          </div>
                      <% end %>

routes

    match "wikis/:wiki_id/pages/:id/revert" =>
''pages#revert'', :as =>
"revert_version"

Also, the route generated with this breaks when a new page is created
under a wiki.

if there is some other tool. then i would like to know that which
would make this task easy :)


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