AASM - Ruby state machines

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

Download

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.

Installation

From GitHub hosted gems

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

Building your own gems

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

Simple Example

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

Other Stuff

Warranty

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.