rails4.1でmigration走らせたら、
% bundle exec rake db:migrate == 20140501144914 AddColumnsForHoge: migrating ========================== -- change_column(:foo, :bar, :integer, {:unsigned=>true, :limit=>8, :null=>true}) rake aborted! StandardError: An error has occurred, all later migrations canceled: undefined method `add_column_options!' for #<ActiveRecord::ConnectionAdapters::Mysql2Adapter:0x007ff86a23fdd8>/path/to/app/db/migrate/20140501144914_add_columns_for_hoge.rb:4:in `change' NoMethodError: undefined method `add_column_options!' for #<ActiveRecord::ConnectionAdapters::Mysql2Adapter:0x007ff86a23fdd8> /path/to/app/db/migrate/20140501144914_add_columns_for_hoge.rb:4:in `change' Tasks: TOP => db:migrate
こんな感じで怒られた。
--traceで調べてみたら、activerecord-mysql-unsignedが問題だったようなんだけど、 activerecord-mysql-unsigned のバージョンを0.1.0に上げたら解消しました。