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首页 > 解决方案 > 为什么 `msg.mentions.users.first` 会导致 TypeError `member.roles.map is not a function`？

javascript - 为什么 `msg.mentions.users.first` 会导致 TypeError `member.roles.map is not a function`？

问题描述

我想做一个列出用户当前角色的命令。

但是当我尝试member.roles.map(roles => `${roles}`).join(', ') or时message.member.roles.map(role => role.name).slice(1).join(", ")，它会抛出这个错误：

TypeError: member.roles.map is not a function
    at Object.exports.run (c:\Users\Flo\Desktop\Discord_Bot\commands\test.js:18:42)
    at Client.<anonymous> (c:\Users\Flo\Desktop\Discord_Bot\index.js:32:14)
    at Client.emit (c:\Users\Flo\Desktop\Discord_Bot\lib\events.js:388:22)
    at MessageCreateAction.handle (c:\Users\Flo\Desktop\Discord_Bot\node_modules\discord.js\src\client\actions\MessageCreate.js:31:14)
    at Object.module.exports [as MESSAGE_CREATE] (c:\Users\Flo\Desktop\Discord_Bot\node_modules\discord.js\src\client\websocket\handlers\MESSAGE_CREATE.js:4:32)
    at WebSocketManager.handlePacket (c:\Users\Flo\Desktop\Discord_Bot\node_modules\discord.js\src\client\websocket\WebSocketManager.js:384:31)
    at WebSocketShard.onPacket (c:\Users\Flo\Desktop\Discord_Bot\node_modules\discord.js\src\client\websocket\WebSocketShard.js:444:22)
    at WebSocketShard.onMessage (c:\Users\Flo\Desktop\Discord_Bot\node_modules\discord.js\src\client\websocket\WebSocketShard.js:301:10)
    at WebSocket.onMessage (c:\Users\Flo\Desktop\Discord_Bot\node_modules\ws\lib\event-target.js:132:16)
    at WebSocket.emit (node:events:376:20) {stack: 'TypeError: member.roles.map is not a function…6)
    at WebSocket.emit (node:events:376:20)', message: 'member.roles.map is not a function'}

这是创建此错误的代码：

let user;

if (msg.mentions.users.first()) {
  user = msg.mentions.users.first();
} else {
  user = msg.author;
}

标签： javascriptdiscord.js

解决方案

从 v12 开始，您需要在 guild#members.cache 和 client#users.cache 等管理器之前添加 .cache。您所要做的就是在 .map 之前添加 .cache 就可以了！

在此处阅读更多信息： https ://discordjs.guide/additional-info/changes-in-v12.html

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