active_record_inline_schema 0.5.7
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:
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install:
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Runtime Dependencies (2):
activerecord
>= 3
activesupport
>= 0