public async Task <DTOs.Invitation> Handle(DTOs.HandleInvitation request) { var invitation = await invitationRepository.Get(request.Invitation.Id); if (invitation == null) { throw new NotFoundException("Invitation", request.Invitation.Id); } await invitationRepository.Remove(invitation.Id); if (!request.Accept) { return(invitation.ToDto()); } var bandMember = BandMember.From(invitation.Guest, invitation.Band); await bandRepository.AddMember(bandMember); return(invitation.ToDto()); }