使ってるのEdge Railsというわけではない(r4573)ので微妙だけどメモ． --- vendor/rails/activerecord/lib/active_record/acts/list.rb.orig 2006-08-18 14:40:37.302625000 +0900 +++ vendor/rails/activerecord/lib/active_record/acts/list.rb 2006-08-18…