state_machine

https://github.com/pluginaweek/state_machine

Ruby

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

StateMachine::Transition#loopback?

Does this transition represent a loopback (i.e. the from and to state
are the same)

== Example

  machine = StateMachine.new(Vehicle)
  StateMachine::Transition.new(Vehicle.new, machine, :park, :parked, :parked).loopback?   # => true
  StateMachine::Transition.new(Vehicle.new, machine, :park, :idling, :parked).loopback?   # => false

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-loopback--for-pr

# Commit to git

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

# 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-loopback--for-pr

hub pull-request

# Celebrate!