first version of multi categories and tags

lib/tasks/migrate.rake

@@ -492,4 +492,24 @@ namespace :migrate do
       pp.save
     end
   end
+
+  task :convert_cate_tag_type => :environment do
+    [Page,PagePart].each do |obj|
+      obj.all.each do |pp|
+        if pp.category.blank?
+          pp.category = []
+        else
+          pp.category = [pp.category]
+        end
+
+        if pp.tag.blank?
+          pp.tag = []
+        else
+          pp.tag = [pp.tag]
+        end      
+        pp.save
+      end
+    end
+  end
+
 end