aasm 0

AASM - State machines for Ruby classes

6 years after

= 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

== New Callbacks

The callback chain & order on a successful event looks like:

oldstate:exit event:before find transition, if possible transition:on_transition oldstate:before_exit newstate:before_enter newstate:enter update state event:success oldstate:after_exit newstate:after_enter event:after obj:aasm_event_fired*

(*) marks old callbacks

== Download

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

== Installation

=== From gemcutter

% sudo gem install gemcutter % sudo gem tumble % sudo gem install aasm

=== From GitHub hosted gems (only older releases are available)

% 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 gemspec % rake build % sudo gem install pkg/aasm-2.1.gem

== Simple Example

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

class Conversation include AASM

aasm_column :current_state # defaults to aasm_state

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

== A Slightly More Complex Example

This example uses a few of the more complex features available.

class Relationship include AASM

aasm_column :status

aasm_initial_state Proc.new { |relationship| relationship.strictly_for_fun? ? :intimate : :dating }

aasm_state :dating,   :enter => :make_happy,        :exit => :make_depressed
aasm_state :intimate, :enter => :make_very_happy,   :exit => :never_speak_again
aasm_state :married,  :enter => :give_up_intimacy,  :exit => :buy_exotic_car_and_wear_a_combover

aasm_event :get_intimate do
  transitions :to => :intimate, :from => [:dating], :guard => :drunk?
end

aasm_event :get_married do
  transitions :to => :married, :from => [:dating, :intimate], :guard => :willing_to_give_up_manhood?
end

def strictly_for_fun?; end
def drunk?; end
def willing_to_give_up_manhood?; end
def make_happy; end
def make_depressed; end
def make_very_happy; end
def never_speak_again; end
def give_up_intimacy; end
def buy_exotic_car_and_wear_a_combover; end

end

= Other Stuff

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

== 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.