state_machine

https://github.com/pluginaweek/state_machine

Ruby

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

StateMachine::Transition#transient?

Is this transition existing for a short period only?  If this is set, it
indicates that the transition (or the event backing it) should not be
written to the object if it fails.

Source | Google | Stack overflow

Edit

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

cd state_machine

open lib/state_machine/transition.rb

Contribute

# Make a new branch

git checkout -b -your-name--update-docs-StateMachine--Transition-transient--for-pr

# Commit to git

git add lib/state_machine/transition.rbgit commit -m "better docs for StateMachine::Transition#transient?"

# Open pull request

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

hub fork

git push <your name> -your-name--update-docs-StateMachine--Transition-transient--for-pr

hub pull-request

# Celebrate!