user.rb

class User < ActiveRecord::Base
  
  # ...
  attr_accessor             :password, :password_confirmation
  attr_accessible           :login, :email, :password, :password_confirmation

  state_machine :state_email, :initial => 'fresh' do
    
    before_transition :to => 'unverified', :do => :make_email_verification_code
    before_transition :to => 'verified', :do => :set_email_verified_attributes
    
    event :unverify do
      transition :to => 'unverified', :from => %w(unverified verified fresh)
    end

    event :verify do
      transition :to => 'verified', :from => %w(unverified verified fresh)
    end
  end
  
  # ...
  
end