How to show roles of user discord.js / userinfo command

问题

I'm trying to make a 'userinfo' command, and I'm currently stuck on showing roles of the user.

Here's my code:

const Discord = module.require('discord.js');
const moment = require('moment');

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

    let user = message.mentions.users.first() || message.author;
    const joinDiscord = moment(user.createdAt).format('llll');
    const joinServer = moment(user.joinedAt).format('llll');
    let embed = new Discord.RichEmbed()
        .setAuthor(user.username + '#' + user.discriminator, user.displayAvatarURL)
        .setDescription(`${user}`)
        .setColor(`RANDOM`)
        .setThumbnail(`${user.displayAvatarURL}`)
        .addField('Joined at:', `${moment.utc(user.joinedAt).format('dddd, MMMM Do YYYY, HH:mm:ss')}`, true)
        .addField('Status:', user.presence.status, true)
        .addField('Roles:', user.roles.map(r => `${r}`).join(' | '), true)
        .setFooter(`ID: ${user.id}`)
        .setTimestamp();

    message.channel.send({ embed: embed });
    return;
}

module.exports.help = {
    name: 'userinfo'
}

I'm getting error TypeError: Cannot read property 'map' of undefined and I don't know how to fix it. Thanks for help. <3

回答1:

User.roles is undefined because that property doesn't exist: try using GuildMember.roles instead:

let member = message.mentions.members.first() || message.member,
  user = member.user;

let embed = new Discord.RichEmbed()
  // ... all the other stuff ...
  .addField('Roles:', member.roles.map(r => `${r}`).join(' | '), true)

The other properties will still use user, but .roles will be related to the GuildMember.

回答2:

try adding this .addField("Roles:", member.roles.map(roles =>${roles}).join(', '), true)

My whole code for this is

let user;
if (message.mentions.users.first()) {
    user = message.mentions.users.first();
} else {
    user = message.`enter code here`author;
}

const member = message.guild.member(user);

const embed = new Discord.RichEmbed()
    .setColor("RANDOM")
    .setThumbnail(message.author.avatarURL)
    .addField(`${user.tag}`, `${user}`, true)
    .addField("ID:", `${user.id}`, true)
    .addField("Nickname:", `${member.nickname !== null ? `${member.nickname}` : 'None'}`, true)
    .addField("Status:", `${user.presence.status}`, true)
    .addField("In Server", message.guild.name, true)
    .addField("Game:", `${user.presence.game ? user.presence.game.name : 'None'}`, true)
    .addField("Bot:", `${user.bot}`, true)
    .addField("Joined The Server On:", `${moment.utc(member.joinedAt).format("dddd, MMMM Do YYYY")}`, true)
    .addField("Account Created On:", `${moment.utc(user.createdAt).format("dddd, MMMM Do YYYY")}`, true) 
    .addField("Roles:", member.roles.map(roles => `${roles}`).join(', '), true)
    .setFooter(`Replying to ${message.author.username}#${message.author.discriminator}`)
message.channel.send({embed});

回答3:

TypeError: Cannot read property 'map' of undefined - this means that somewhere in your code happening a situation of execution .map function of undefined variable.

You have only one map. Here:

   .addField('Roles:', user.roles.map(r => `${r}`).join(' | '), true)
                               // ^^^

This line trows this error, so this means that user.roles is undefined.

Try to:

let user = message.mentions.users.first() || message.author;
console.log(user.roles); // it is undefined

回答4:

Propably user.roles is undefined.

If it's ok that user has no roles, you can replace:

.addField('Roles:', user.roles.map(r => `${r}`).join(' | '), true)

with:

.addField('Roles:', user.roles ? user.roles.map(r => `${r}`).join(' | ') : "", true)

This will set empty string in case when there's no roles property in user object.

Another option is to set user.roles to empty array if it doesn't exist (or do something else in this if, i.e. throw error):

let user = /* get user*/
if (!user.roles){
    user.roles = [];
}

来源：https://stackoverflow.com/questions/53253350/how-to-show-roles-of-user-discord-js-userinfo-command