mp分页+批量 查询

@Override
public PageDTO pageCoupons(UserCouponQuery query) {
    Long userId = UserContext.getUser();
    userId = 2L;
    LambdaQueryWrapper<UserCoupon> queryWrapper = new LambdaQueryWrapper<UserCoupon>().eq(UserCoupon::getUserId, userId);
    List<UserCoupon> userCouponList = this.list(queryWrapper);
    List<Long> couponIds = userCouponList.stream().map(UserCoupon::getCouponId).distinct().collect(Collectors.toList());
    Page<Coupon> couponPage = new Page<>(query.getPageNo(), query.getPageSize());
    LambdaQueryWrapper<Coupon> wrapper = new LambdaQueryWrapper<>();
    if (CollUtil.isNotEmpty(couponIds)) {
        wrapper.in(Coupon::getId, couponIds);
    }
    Page<Coupon> resultPage = couponMapper.selectPage(couponPage, wrapper);
    List<Coupon> records = resultPage.getRecords();
    return PageDTO.of(resultPage, records);

}