如何在嵌入 [discord.js] 中发布排行榜

Question

I have a discord.js leveling system that stores peoples levels in a json file database.json like this: {"626916199783071750":{"xp":54,"level":14} I am sorting everyone's levels using this code:

members.sort(function(a, b) {
  const keyA = a[Object.keys(a)[0]].level,
        keyB = b[Object.keys(a)[0]].level;
  // Compare
  // (swap -1 and 1 to change sort order)
  if(keyA < keyB) return -1;
  if(keyA > keyB) return 1;
  return 0;
});
console.log(members);

(members is being defined with const members = [require("./database.json")]; ) I am able to log it fine and it is in the correct order but I was wondering how I would send that in an embed as this code was not working:

      let embed = new Discord.RichEmbed()
      .setColor(0x4286f4)
      .addField('Level:', members)
      member.channel.send(embed);

This was giving me an embed with just undefined as a field. For reference i am using discord.js v12+

Answer 1

After editing multiple times and talking with you below, I allow myself to make some changes to your bot's way of functioning.

Data storage

First of all, the way you store data is kind of bad. JSON is a bad choice and is very annoying to use as a DB, but it remains an option. You should check out Quick.db , which is excellent for beginners, On the other hand, you always , always, want to store documents in an array. Arrays are literally made for that. Here's some code to switch your current data to the new model. Don't forget to also update the other parts of your bot that store data so it matches the new shape. I don't want to make too many changes, but I'd like to add that storing the level is a bad idea, since it depends on xp . You should write a function that converts xp into level and use it, instead of storing level .

 // const fs = require("fs") // const oldDb = JSON.parse(fs.readFileSync("database.json")) const oldDb = { "626916199783071750": { "xp": 69, "level": 14 }, "579776588732956674": { "xp": 2, "level": 13 }, "784566696244674621": { "xp": 99, "level": 1 }, "495304082769051660": { "xp": 6, "level": 1 }, "752987763573391411": { "xp": 1, "level": 0 } } let newDb = Object.keys(oldDb).map((id) => ({ id, xp: oldDb[id].xp, level: oldDb[id].level }) ) console.log(newDb) // fs.writeFile("database.json", JSON.stringify(newDb), 'utf8')

Sorting by level

From that point, you'll be able to work in a much more efficient way. Since we've changed the bot's data model, I'll help you convert the sorting method into one that actually works.

 // const users = require("./database.json"), with the new data model this time const users = [{ id: "626916199783071750", level: 14, xp: 69 }, { id: "579776588732956674", level: 13, xp: 2 }, { id: "784566696244674621", level: 1, xp: 99 }, { id: "495304082769051660", level: 1, xp: 6 }, { id: "752987763573391411", level: 0, xp: 1 }] const sortedUsers = users.sort((a, b) => (a.level > b.level)? 1: -1) // ternary operation, it's basically just a 'if' console.log(sortedUsers)

Post leaderboard

Ah, you did it, Now. here's my original answer... how to send all that data. You'd need to add a field for each member. MessageEmbed#addFields() is perfect here. The code below isn't tested.

const maxNumberOfUsersToDisplay = 10;

const embed = new Discord.MessageEmbed().setColor(0x4286f4).addFields(
  sortedUsers.flatMap((userDoc, i) => {
    // flatMap will map and delete all the [] of the array
    if (!(i < maxNumberOfUsersToDisplay && i < 25)) return [];

    return {
      name: user.id, // Feel free to mess with the code and replace this with a mention/tag
      value: `Level ${user.level}`,
      inline: false, // default value, just to show you you can adjust this param to change the embed layout
    };
  })
);

message.channel.send(embed);

Array#flatMap() acts like a .map() and a .flat() , it's an obscure method that should be used more often: it can also be used as a .map() and a .filter() , as shown above.