为用户 [Discord.js] 使用提及和 ID 命令

Question

Can someone help? I wanted my commands to be able to be used with @olios or 49556804 *** 0471817. I don't know what I'm doing wrong but my code isn't working.

 let userLevel = mentions.users.first () || msg.guild.members.cache.get (args [0]) || msg.author
 const userLevelID = userLevel.id
 const userLevelName = userLevel.user.username

And I get something like this from the console:

TypeError: Cannot read property 'username' of undefined

Can it be done at all, or it worked on mentions and ID?

Answer 1

While both msg.mentions.users.first() and msg.author return a User , msg.guild.members.cache.get(args[0]) returns a GuildMember . Both User and GuildMember have an id property, but only GuildMember has a user .

If you try to get the user from a GuildMember , you will be fine, but you will always receive a TypeError if you try to get it from a User .

You can update your code to get the user from message.guild.members.cache.get(args[0]) only. I used optional chaining ( ? ) to ignore it if there is no args[0] and fall back to msg.author .

The following will work with all three cases:

let userLevel =
  msg.mentions.users.first() ||
  msg.guild.members.cache.get(args[0])?.user ||
  msg.author;
const userLevelID = userLevel.id;
const userLevelName = userLevel.username;

console.log({ userLevelID, userLevelName });

Optional chaining requires Node.js v14+. If you have an older version you can use a simple AND operator:

let userLevel =
  message.mentions.users.first() ||
  (message.guild.members.cache.get(args[0]) &&
    message.guild.members.cache.get(args[0]).user) ||
  message.author;