def METHOD_NAME(self, rejection_message, show_redirect_url=True, **kwargs):
    self.validated = False
    self.rejected = True
    self.ready_for_validation = False
    if self.owner is None:
        self.save()
        return
    elif rejection_message:
        self.validation_message = rejection_message
    self.save()
    self.send_notification_email(
        subject=self.EMAIL_REJECTION_SUBJECT,
        email_template=self.EMAIL_REJECTION_TEMPLATE,
        show_redirect_url=show_redirect_url
    )