state_machine

https://github.com/pluginaweek/state_machine

Ruby

Adds support for creating state machines for attributes on any Ruby class

ActiveRecord::ConnectionAdapters::TableDefinition#datetime_with_timezone

Adds specified column with appropriate timestamp type

It is used in table creation like:
create_table 'users' do |t|
  t.datetime_with_timezone :did_something_at
end

Source | Google | Stack overflow

Edit

git clone [email protected]:pluginaweek/state_machine.git

cd state_machine

open

Contribute

# Make a new branch

git checkout -b -your-name--update-docs-ActiveRecord--ConnectionAdapters--TableDefinition-datetime_with_timezone-for-pr

# Commit to git

git add git commit -m "better docs for ActiveRecord::ConnectionAdapters::TableDefinition#datetime_with_timezone"

# Open pull request

gem install hub # on a mac you can `brew install hub`

hub fork

git push <your name> -your-name--update-docs-ActiveRecord--ConnectionAdapters--TableDefinition-datetime_with_timezone-for-pr

hub pull-request

# Celebrate!