state_machine

https://github.com/pluginaweek/state_machine

Ruby

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

StateMachine::Integrations::ActiveModel#notify

Notifies observers on the given object that a callback occurred
involving the given transition.  This will attempt to call the
following methods on observers:
* <tt>#{type}_#{qualified_event}_from_#{from}_to_#{to}</tt>
* <tt>#{type}_#{qualified_event}_from_#{from}</tt>
* <tt>#{type}_#{qualified_event}_to_#{to}</tt>
* <tt>#{type}_#{qualified_event}</tt>
* <tt>#{type}_transition_#{machine_name}_from_#{from}_to_#{to}</tt>
* <tt>#{type}_transition_#{machine_name}_from_#{from}</tt>
* <tt>#{type}_transition_#{machine_name}_to_#{to}</tt>
* <tt>#{type}_transition_#{machine_name}</tt>
* <tt>#{type}_transition</tt>

This will always return true regardless of the results of the
callbacks.

Source | Google | Stack overflow

Edit

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

cd state_machine

open lib/state_machine/integrations/active_model.rb

Contribute

# Make a new branch

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

# Commit to git

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

# 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-notify-for-pr

hub pull-request

# Celebrate!