class Message < ActiveRecord::Base
  belongs_to :from, :class_name => "User"
  belongs_to :to, :class_name => "User"
 
  acts_as_tree :order => "updated_at DESC"
 
  state_machine :sent_state, :initial => :none do
    event :sent do
      transition [:none, :draft] => :sent
    end
    event :draft do
      transition :none => :draft
    end
    event :remove do
      transition all => :deleted
    end
  end
 
  state_machine :received_state, :initial => :none, :namespace => 'message' do
    event :sent do
      transition :none => :unread
    end
    event :read do
      transition :unread => :read
    end
    event :unread do
      transition :read => :unread
    end
    event :archive do
      transition all - [:deleted] => :archived
    end
    event :remove do
      transition all => :deleted
    end
  end
end
 
# == Schema Information
# Schema version: 20090604140050
#
# Table name: messages
#
#  id             :integer         not null, primary key
#  from_id        :integer         not null
#  to_id          :integer         not null
#  parent_id      :integer
#  subject        :string(255)     not null
#  body           :text            not null
#  received_state :string(255)     default("unread"), not null
#  sent_state     :string(255)     default("draft"), not null
#  created_at     :datetime
#  updated_at     :datetime
#