huiting/cloudfunctions/getFavorite/index.js

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

cloud.init()
const db = cloud.database()

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

  const favorite = await db.collection('favorite')
    .where({
      user_id: OPENID,
      msg_id: event.msg_id
    })
    .count()

  return {
    total: favorite.total,
    status: 'OK'
  }
}