huiting/cloudfunctions/listSearches/index.js

// 云函数入口文件
const cloud = require('wx-server-sdk')

cloud.init()
const db = cloud.database()
const _ = db.command
const $ = db.command.aggregate

// 云函数入口函数
exports.main = async (event, context) => {
  const {
    OPENID
  } = cloud.getWXContext()

  const searches = await db.collection('search')
    .aggregate()
    .match(_.expr($.lt([$.subtract([new Date(), '$search_time']), 1000 * 60 * 60 * 24])))
    .group({
      _id: '$keyword',
      total: $.sum(1)
    })
    .sort({
      total: -1
    })
    .limit(8)
    .end()

  return {
    list: searches.list,
    status: 'OK'
  }
}