Added the ability to easily rollback to a previous version of a wiki page.

git-svn-id: http://redmine.rubyforge.org/svn/trunk@424 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/controllers/wiki_controller.rb

@@ -27,7 +27,7 @@ class WikiController < ApplicationController
       edit
       render :action => 'edit' and return
     end
-    @content = (params[:version] ? @page.content.versions.find_by_version(params[:version]) : @page.content)
+    @content = @page.content_for_version(params[:version])
     if params[:export] == 'html'
       export = render_to_string :action => 'export', :layout => false
       send_data(export, :type => 'text/html', :filename => "#{@page.title}.html")
@@ -43,7 +43,8 @@ class WikiController < ApplicationController
   def edit
     @page = @wiki.find_or_new_page(params[:page])    
     @page.content = WikiContent.new(:page => @page) if @page.new_record?
-    @content = @page.content
+    
+    @content = @page.content_for_version(params[:version])
     @content.text = "h1. #{@page.pretty_title}" if @content.text.blank?
     # don't keep previous comment
     @content.comment = nil

app/models/wiki_page.rb

@@ -32,6 +32,12 @@ class WikiPage < ActiveRecord::Base
     WikiPage.pretty_title(title)
   end
   
+  def content_for_version(version=nil)
+    result = content.versions.find_by_version(version.to_i) if version
+    result ||= content
+    result
+  end
+  
   def self.pretty_title(str)
     (str && str.is_a?(String)) ? str.tr('_', ' ') : str
   end

app/views/wiki/show.rhtml

@@ -1,5 +1,6 @@
 <div class="contextual">
 <%= link_to(l(:button_edit), {:action => 'edit', :page => @page.title}, :class => 'icon icon-edit') if @content.version == @page.content.version %>
+<%= link_to(l(:button_rollback), {:action => 'edit', :page => @page.title, :version => @content.version }, :class => 'icon icon-cancel') if @content.version < @page.content.version %>
 <%= link_to(l(:label_history), {:action => 'history', :page => @page.title}, :class => 'icon icon-history') %>
 <%= link_to(l(:label_page_index), {:action => 'special', :page => 'Page_index'}, :class => 'icon icon-index') %>
 </div>