对象转对象

public void repetition(Long id) {
    // 查询当前用户id
    Long userId = BaseContext.getCurrentId();

    // 根据订单id查询当前订单详情
    List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(id);

    // 将订单详情对象转换为购物车对象
    List<ShoppingCart> shoppingCartList = orderDetailList.stream().map(x -> {
        ShoppingCart shoppingCart = new ShoppingCart();

        // 将原订单详情里面的菜品信息重新复制到购物车对象中
        BeanUtils.copyProperties(x, shoppingCart, "id");
        shoppingCart.setUserId(userId);
        shoppingCart.setCreateTime(LocalDateTime.now());

        return shoppingCart;
    }).collect(Collectors.toList());

    // 将购物车对象批量添加到数据库
    shoppingCartMapper.insertBatch(shoppingCartList);
}