public async Task Handle(DeleteActionItem command)
        {
            var retrospective = await _store.GetById <Retrospective>(command.RetrospectiveId);

            retrospective.DeleteActionItem(command.ActionItemId, command.ParticipantId);
            await _store.Save(retrospective, retrospective.Version);
        }
        public async Task <IActionResult> DeleteActionItem(Guid retrospectiveId, Guid actionItemId, string participantId)
        {
            var retro = await _aggRepo.GetById <Retrospective>(retrospectiveId);

            var cmd = new DeleteActionItem(retrospectiveId, actionItemId, participantId);
            await _cmdSender.Send(cmd);

            return(RedirectToAction("Get", new { retrospectiveId = retrospectiveId }));
        }