更新mongodb文档，如果文档存在，否则创建

Question

So I am trying to make a discord bot for me and my friends for tracking stats in CS GO 10 mans, and I am using cheerio for webscraping from the site that provides us the stats, and then pass them into mongodb. The scrapping functionality works fine, but im trying to figure out how to avoid creating duplicate documents for each user. If I enter *userid 857575 it pulls the stats for that user, and puts in the DB, but if i call that multiple times, its making multiple documents in the DB. My question is, how would I get mongodb to update the document based on if the message author in discord matches the username in the db? So if username bob sends *userid3939 and bob already exists in the db, update the document. If bob doesnt exist, create document. code below, appreciate any tips.

    module.exports.run = async (bot, message, args) => {


    console.log(args);
    var userUrl = 'https://popflash.site/user/' +args;
    console.log(userUrl);
    console.log(message.member.user.tag);


     rp(userUrl)
         .then(function (html) {
             const arr = [];
             var i = 0;

             $('.stat-container', html).each(function (key, value) {
                 arr[i++] = $(this).find(".stat").text();

             });



             const stats = new Stats({
                 _id: mongoose.Types.ObjectId(),
                 userName: message.member.user.tag,
                 userId: args,
                 HLTV: arr[0],
                 ADR: arr[1],
                 HS: arr[2],
                 W: arr[3],
                 L: arr[4],
                 T: arr[5],
                 win_percent: arr[6]
             });



             stats.save()
                 .then(function (result) {                   
                    let botembed = new Discord.RichEmbed()
                        .setDescription(message.member.user + "'s 10 Man stats")
                        .setColor("#15f153")
                        .addField("stats", result)                        

                         return message.channel.send(botembed);


                 })

         })

}

module.exports.help = {
    name: "userid"
}

Answer 1

Through db.collection.update , you can specify the upsert: true option to get the behavior I think you're desiring. It will update an existing record if matched, otherwise it will create a new record.