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True/False fields have a great simplicity about them, and many times they're perfect for the job! But, it's not uncommon end up in a place where you'd really love to keep some degree of simplicity with a little more detail about when the value was changed. Sometimes you'll want to display that information to the user and other times you'll keep it for auditing or debugging purposes. Either way, boolean_timestamp makes the job easy from the beginning and adds very little code to your app.


Add this line to your application's Gemfile:

gem "boolean_timestamp"

And then execute:

$ bundle

Or install it yourself as:

$ gem install boolean_timestamp


In any ActiveRecord model, you can define a boolean field based on a timestamp column by including the BooleanTimestmap module and calling a single method.

class Article < ActiveRecord::Base
  include BooleanTimestamp
  boolean_timestamp :published # works with an existing column named `published_at`

The gem doesn't provide any code for setting up the database column. You'll need to use Rails migrations (or any other means you choose) to create the tables and columns you need.


After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to


Bug reports and pull requests are welcome on GitHub at This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.


The gem is available as open source under the terms of the MIT License.

Code of Conduct

Everyone interacting in the BooleanTimestamp project’s codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.