public ActionResult JoinEvent(
            [FromRoute, SwaggerParameter("The ID of the Code Event", Required = true)]
            long codeEventId
            )
        {
            var userCanRegister =
                _codeEventService.CanUserRegisterAsMember(codeEventId, HttpContext.User);

            if (!userCanRegister)
            {
                return(BadRequest());
            }

            _codeEventService.JoinCodeEvent(codeEventId, HttpContext.User);

            return(NoContent());
        }