column_timestamps 0.1.1
Works "automagically" like updated_at...just add a column named _updated_at, and when your column changes, the timestamp will be updated.
Gemfile:
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install:
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Runtime Dependencies (1):
activerecord
>= 2.1.0
Development Dependencies (2):
rspec
>= 1.2.9
sqlite3-ruby
>= 1.2.5