audio.rb

class Audio < ActiveRecord::Base
  def self.sync!
    [Audio::ProgramAudio, Audio::DirectAudio, Audio::EncoAudio].each do |klass|
      klass.sync!
    end
  end

  class EncoAudio < Audio
    def self.sync!
      sync_awaiting_audio_if_file_exists!
    end
  end

  class ProgramAudio < Audio
    def self.sync!
      # do other stuff
    end
  end

  class DirectAudio < Audio
    def self.sync!
      sync_awaiting_audio_if_file_exists!
    end
  end
  
  class UploadedAudio < Audio
    # no sync method
  end


    class << self
      private
      def sync_awaiting_audio_if_file_exists!
        # check if file exists and set audio
      end
    end
  #
end