notifications.rb

module Devices
  module Common
    class Reports  < Devices::Common::Notifiers; end
    class Warnings < Devices::Common::Notifiers; end
    class Errors   < Devices::Common::Notifiers; end
  end
end

notifier.rb

module Devices
  module Common
    class Notifier
      attr_accessor :message, :sender, :level
      def initialize(*params)
        @message, @sender, @level = params
        @message = Rails.env == "development" ? "#{@sender} - #{@message}" : "#{@message}"
      end
    end
  end
end

notifiers.rb

module Devices
  module Common    
    class Notifiers     
      include Enumerable

      def initialize
        @notifications = []
      end

      def <<(val)
        @notifications << val
      end

      def each(&block)
        @notifications.each(&block)
      end

      def empty?
        @notifications.count == 0
      end

      def add(msg, level = 1)
        sender = "#{caller[0].to_s}"
        @notifications << Devices::Common::Notifier.new(msg, sender, level)
      end

      def concat(ary)
        ary.each do |notification|
          @notifications << notification
        end
      end

      def clear()
         @notifications = []
      end

    end
  end
end