Change the design for the whole site form designs index

app/controllers/admin/sites_controller.rb

@@ -57,6 +57,24 @@ class Admin::SitesController < ApplicationController
     
   end
 
+  def change_design
+    design = Design.find(params[:site_id]) rescue nil
+    update_design(design) if design
+    render :nothing => true
+  end
+
+  protected
+
+  def update_design(design)
+    @site.design = design
+    if @site.save
+      theme_id = design.themes.first.id
+      Page.all.each do |page|
+        page.update_attributes({design_id: design.id, theme_id: (theme_id unless page.root?)})
+      end
+    end
+  end
+
   private
 
   def get_site