public JsonResult Editer(int? id, ReservationView resaview)
        {
            if (ModelState.IsValid)
            {
                reservation resa;
                object retour;
                var resas = cnx.reservation.Where(r => r.id_materiel == resaview.id_matos && r.date_fin > resaview.debut && r.date_debut < resaview.fin && r.employe.z_actif == true);
                if (id.HasValue)
                {
                    resas = resas.Where(r => r.id_reservation != id);
                }
                if (resas.Any()) return Json(new { succes = 0, message = "La ressource n'est pas disponible." });
                if (!id.HasValue)
                {
                    resa = new reservation();
                    resa.UpdateFromModelView(resaview);

                    cnx.AddToreservation(resa);
                    cnx.SaveChanges();
                    retour = new { succes = 1, creation=1, resa = resa.PourJson() };
                } else {
                    resa=cnx.reservation.Where(r=>r.id_reservation==id).Single();
                    resa.UpdateFromModelView(resaview);
                    cnx.ObjectStateManager.ChangeObjectState(resa, EntityState.Modified);
                    cnx.SaveChanges();
                    retour = new { succes = 1, creation = 0 };
                }

                return Json(retour);
            }
            else
            {
                return Json(new { succes = 0, message = "Une erreur s'est produite" });
            }
        }