updated to rails 3.1.3

script/upgrade_schema.rb

@@ -0,0 +1,11 @@
+#!/usr/bin/env ruby
+
+require File.expand_path(File.join(File.dirname(__FILE__), '..', 'config', 'environment'))
+
+PoolVersion.find_each do |version|
+  version.update_column(:post_ids, version.post_ids.scan(/\d+/).in_groups_of(2).map {|x| x.first}.join(" "))
+end
+
+TagImplication.find_each do |impl|
+  impl.update_descendant_names!
+end