Authorization states in a Proc

customer.rb

class Customer < AR::Base
  authorization_states = Proc.new do
    event :start_authorizing do
      transition all => :authorizing
    end

    event :finish_authorizing do
      transition :authorizing => :authorized
    end

    event :fail_to_authorize do
      transition [:authorizing, :unauthorized] => :auth_failure
    end

    event :deauthorize do
      transition all => :unauthorized
    end
  end


  state_machine :facebook_auth_state, {
                  :initial => :unauthorized,
                  :namespace => 'facebook'
                }, &authorization_states

  state_machine :twitter_auth_state, {
                  :initial => :unauthorized,
                  :namespace => 'twitter'
                }, &authorization_states

end