state_machine

https://github.com/pluginaweek/state_machine

Ruby

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

StateMachine::Callback#call

Runs the callback as long as the transition context matches the branch
requirements configured for this callback.  If a block is provided, it
will be called when the last method has run.

If a terminator has been configured and it matches the result from the
evaluated method, then the callback chain should be halted.

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-call-for-pr

# Commit to git

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

# 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-call-for-pr

hub pull-request

# Celebrate!