state_machine

https://github.com/pluginaweek/state_machine

Ruby

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

StateMachine::Integrations::ActiveModel::ObserverUpdate#class

The class of the object being transitioned.  Normally the object
getting passed into observer methods is the actual instance of the
ActiveModel class.  ActiveModel uses that instance's class to check
for enabled / disabled observers.

Since state_machine is passing an ObserverUpdate instance into observer
methods, +class+ needs to be overridden so that ActiveModel can still
get access to the enabled / disabled observers.

Source | Google | Stack overflow

Edit

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

cd state_machine

open lib/state_machine/integrations/active_model/observer_update.rb

Contribute

# Make a new branch

git checkout -b -your-name--update-docs-StateMachine--Integrations--ActiveModel--ObserverUpdate-class-for-pr

# Commit to git

git add lib/state_machine/integrations/active_model/observer_update.rbgit commit -m "better docs for StateMachine::Integrations::ActiveModel::ObserverUpdate#class"

# 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--Integrations--ActiveModel--ObserverUpdate-class-for-pr

hub pull-request

# Celebrate!