订单分页查询

 /**
     * 订单分页查询
     * @param page
     * @param pageSize
     * @return
     */
    @GetMapping("/userPage")
    public R<Page<OrdersDto>> page(Integer page, Integer pageSize){
        //创建分页构造器
        Page<Orders> pageInfo = new Page<>(page, pageSize);
        LambdaQueryWrapper<Orders> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(Orders::getUserId, BaseContext.getCurrentId());
        queryWrapper.orderByDesc(Orders::getOrderTime);
        orderService.page(pageInfo, queryWrapper);

        Page<OrdersDto> page1 = new Page<>(page, pageSize);
        BeanUtils.copyProperties(pageInfo, page1, "records");
        //将每个order和对应的orderDetail封装成orderDto
        List<Orders> records = pageInfo.getRecords();
        List<OrdersDto> list =  records.stream().map((item) -> {
            OrdersDto ordersDto = new OrdersDto();
            BeanUtils.copyProperties(item, ordersDto);
            LambdaQueryWrapper<OrderDetail> wrapper = new LambdaQueryWrapper<>();
            wrapper.eq(OrderDetail::getOrderId, ordersDto.getId());
            List<OrderDetail> orderDetails = orderDetailService.list(wrapper);
            ordersDto.setOrderDetails(orderDetails);
            return ordersDto;
        }).collect(Collectors.toList());

        page1.setRecords(list);
        return R.success(page1);
    }