active_record_inline_schema 0.5.9
Specify columns like you would with ActiveRecord migrations and then run .auto_upgrade! Based on the mini_record gem from Davide D'Agostino, it adds fewer aliases, doesn't create timestamps and relationship columns automatically.
Gemfile:
=
install:
=
Runtime Dependencies (2):
activerecord
>= 3
activesupport
>= 0