This package contains AASM, a library for adding finite state machines to Ruby classes.

AASM started as the acts_as_state_machine plugin but has evolved into a more generic library that no longer targets only ActiveRecord models.

AASM has the following features:

• States

• Machines

• Events

• Transitions

The latest AASM can currently be pulled from the git repository on github.

• github.com/rubyist/aasm/tree/master

A release and a gem are forthcoming.

% sudo gem sources -a http://gems.github.com # (you only need to do this once)
% sudo gem install rubyist-aasm

% rake gem
% sudo gem install pkg/aasm-2.0.1.gem

Here’s a quick example highlighting some of the features.

class Conversation
  include AASM

  aasm_initial_state :unread

  aasm_state :unread
  aasm_state :read
  aasm_state :closed

  aasm_event :view do
    transitions :to => :read, :from => [:unread]
  end

  aasm_event :close do
    transitions :to => :closed, :from => [:read, :unread]
  end
end

Author

Scott Barron <scott at elitists dot net>

License

Copyright 2006, 2007, 2008 by Scott Barron. Released under an MIT-style license. See the LICENSE file included in the distribution.

Bugs

rubyist.lighthouseapp.com/projects/13207-aasm/

GitHub

github.com/rubyist/aasm/tree/master

This software is provided “as is” and without any express or implied warranties, including, without limitation, the implied warranties of merchantibility and fitness for a particular purpose.