public async Task <int> Handle(CreateVehicleCommand request, CancellationToken cancellationToken) { if (await VehicleHelper.IsVehicleNumberOccupied(request.Number, _context)) { throw new ConflictException("Vehicle number is occupied!"); } var vehicle = new Domain.Entities.Vehicle { OwnerUserId = request.OwnerUserId, Brand = request.Brand, Model = request.Model, Year = request.Year, Number = request.Number, Country = request.Country }; await _context.Vehicle.AddAsync(vehicle); await _context.SaveChangesAsync(cancellationToken); return(vehicle.VehicleId); }