code: def do_imports(self):
          
          self.do_import('worker_class', Worker)
          self.do_import('queue_model', self.options.worker_class.queue_model)
          self.do_import('error_model', self.options.worker_class.error_model)
          self.do_import('callback', self.options.worker_class.callback)
docs: Import all importable options