state_machine

https://github.com/pluginaweek/state_machine

Ruby

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

StateMachine::Event#transition_for

Finds and builds the next transition that can be performed on the given
object.  If no transitions can be made, then this will return nil.

Valid requirement options:
* <tt>:from</tt> - One or more states being transitioned from.  If none
  are specified, then this will be the object's current state.
* <tt>:to</tt> - One or more states being transitioned to.  If none are
  specified, then this will match any to state.
* <tt>:guard</tt> - Whether to guard transitions with the if/unless
  conditionals defined for each one.  Default is true.

Source | Google | Stack overflow

Edit

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

cd state_machine

open lib/state_machine/event.rb

Contribute

# Make a new branch

git checkout -b -your-name--update-docs-StateMachine--Event-transition_for-for-pr

# Commit to git

git add lib/state_machine/event.rbgit commit -m "better docs for StateMachine::Event#transition_for"

# 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--Event-transition_for-for-pr

hub pull-request

# Celebrate!