inviter.rb

module Invite
  module Inviter

    def self.included(base)
      base.extend(ClassMethods)
    end

    module ClassMethods

      attr_accessor :invite_block

      def acts_as_inviter(&block)
        @@invite_block = block
      end

    end
    
    def approve!(user)
      @@invite_block.call user
    end
    
  end
end