“错误”：{“ok”：0，“code”：5107201，“codeName”：“Location5107201”，“$clusterTime”：{“clusterTime”：{“$timestamp”：“7292060947630260235”}，“signature”：{“hash”：“HQW2T+0z31Kf8q6iLViqdu0uYtQ="，“keyId”：{“low”：2，“high”：1683641553，“unsigned”：© 2019 www.szb.com版权所有并保留所有权利

let page = 1;
let limit = 10;
let sort = {};
let skip =(page-1)*limit
//req.query.sort is coming as 'name' or '-name'
  if (req.query.sort) {
     const key = req.query.sort;
     if (req.query.sort[0] === "-") {
        sort[`${key.substring(1)}`] = -1;
        sort["_id"] = 1;
     } else {
        sort[`${key}`] = 1;
        sort["_id"] = 1;
     }
  } else {
     sort.dateCreated = 1;
  }

const reviewsList = await Review.aggregate([
     { $match: filter },
     {
        $lookup: {
           from: "users",
           localField: "user",
           foreignField: "_id",
           as: "user",
        },
     },
     {
        $unwind: "$user",
     },
     {
        $lookup: {
           from: "products",
           localField: "product",
           foreignField: "_id",
           as: "product",
        },
     },
     {
        $unwind: "$product",
     },
     {
        $sort: sort,
     },
     { $skip: skip },
     { $limit: limit },
  ]);

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