design code suggestions?

parser_worker.rb

class ToolParserWorker
  include Sidekiq::Worker

  def perform(scan)

    ## On a near futute NessusParser will die an become a ParserFactory based on scan tool type
    report = NessusParser.execute(self.file.current_path) # execute returns a Report object

    scan.update_parsed_report(report.to_json) # scan is mongo document
  end
end

Não tinha entendido que haveriam vários parsers, neste caso fico com a solução do @pellegrino, reescrita pelo @caike