state_machine

https://github.com/pluginaweek/state_machine

Ruby

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

StateMachine::Callback#branch

The branch that determines whether or not this callback can be invoked
based on the context of the transition.  The event, from state, and
to state must all match in order for the branch to pass.

See StateMachine::Branch for more information.

Source | Google | Stack overflow

Edit

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

cd state_machine

open lib/state_machine/callback.rb

Contribute

# Make a new branch

git checkout -b -your-name--update-docs-StateMachine--Callback-branch-for-pr

# Commit to git

git add lib/state_machine/callback.rbgit commit -m "better docs for StateMachine::Callback#branch"

# 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--Callback-branch-for-pr

hub pull-request

# Celebrate!