state_machine

https://github.com/pluginaweek/state_machine

Ruby

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

StateMachine::StateCollection#by_priority

Gets the order in which states should be displayed based on where they
were first referenced.  This will order states in the following priority:

1. Initial state
2. Event transitions (:from, :except_from, :to, :except_to options)
3. States with behaviors
4. States referenced via +state+ or +other_states+
5. States referenced in callbacks

This order will determine how the GraphViz visualizations are rendered.

Source | Google | Stack overflow

Edit

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

cd state_machine

open lib/state_machine/state_collection.rb

Contribute

# Make a new branch

git checkout -b -your-name--update-docs-StateMachine--StateCollection-by_priority-for-pr

# Commit to git

git add lib/state_machine/state_collection.rbgit commit -m "better docs for StateMachine::StateCollection#by_priority"

# 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--StateCollection-by_priority-for-pr

hub pull-request

# Celebrate!