public async Task <int> insert(maintenance_repair_order_model model)
        {
            model.db.repair_status = 1;
            //model.db.maintenance_period = _context.maintenance_systems.Where(m=>m.id == model.db.id_maintenance_system).Select(m=> m.maintenance_period).SingleOrDefault();
            await _context.maintenance_repair_orders.AddAsync(model.db);

            _context.SaveChanges();
            return(1);
        }
        public int update(maintenance_repair_order_model model)
        {
            var db = _context.maintenance_repair_orders.Where(d => d.id == model.db.id).FirstOrDefault();

            db.name                         = model.db.name;
            db.status_del                   = model.db.status_del;
            db.id_factory                   = model.db.id_factory;
            db.id_factory_line              = model.db.id_factory_line;
            db.id_maintenance_system        = model.db.id_maintenance_system;
            db.id_maintenance_system_device = model.db.id_maintenance_system_device;
            db.update_by                    = model.db.update_by;
            db.update_date                  = model.db.update_date;
            _context.SaveChanges();
            return(1);
        }