enumerated_state

Implement state patterns for your enumerated_attributes

Resources

Install

• sudo gem enumerated_state

Use

• require ‘enumerated_state’

Description

This gem falls under the family of gems ASPIUM, ie (Another State Pattern Implementation Using Mixology). However, this one adds much needed state pattern support for enumerated attributes (see github.com/jeffp/enumerated_attribute) and supports multiple states per objection since each attribute manages a state.

Basic implementation

So if you are using enumerated_attribute for an object tractor, you can replace the following code

case
when tractor.gear_is_first? then 'forwards'
when tractor.gear_is_reverse? then 'backwards'
else
  'stopped'
end

with the more maintainable version

tractor.direction

if you define

class Tractor
  enum_attr :gear, %w(reverse ^neutral first), allow_nil=>false
  acts_as_enumerated_state :gear

  module Reverse
    def direction; 'backwards'; end
  end
  module Neutral
    def direction; 'stopped'; end
  end
  module First
    def direction; 'forwards'; end
  end
end

Dependencies

• meta_programming

• mixology

• enumerated_attribute