# File lib/paperclip/attachment.rb, line 257
    def fingerprint
      if instance_read(:fingerprint)
        instance_read(:fingerprint)
      elsif @instance.respond_to?("#{name}_fingerprint".to_sym)
        @queued_for_write[:original] && generate_fingerprint(@queued_for_write[:original])
      else
        nil
      end
    end