在 guild.roles 中获取未定义

Posted 2023-03-14

【中文标题】在 guild.roles 中获取未定义

【英文标题】：fetch undefined in guild.roles

【发布时间】：2021-02-23 23:16:32

【问题描述】：

您好，我正在尝试编写一个 discordbot，将公会 A 中成员的角色 A 同步到 guildB 这些角色由 ID 定义 我遇到的问题是var users1 = guild1.roles.fetch(args[2]).members; //guild1role 抛出

(node:54852) UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'fetch' of undefined
at SyncRole.run (D:\git\purgebot\Commands\General\syncrole.js:49:37)
at Message.run (D:\git\purgebot\Events\message.js:49:13)
at Luna.<anonymous> (D:\git\purgebot\Luna.js:92:83)
at Luna.emit (events.js:314:20)
at MessageCreateAction.handle (D:\git\purgebot\node_modules\discord.js\src\client\actions\MessageCreate.js:31:14)
at Object.module.exports [as MESSAGE_CREATE] (D:\git\purgebot\node_modules\discord.js\src\client\websocket\handlers\MESSAGE_CREATE.js:4:32)
at WebSocketManager.handlePacket (D:\git\purgebot\node_modules\discord.js\src\client\websocket\WebSocketManager.js:384:31)
at WebSocketShard.onPacket (D:\git\purgebot\node_modules\discord.js\src\client\websocket\WebSocketShard.js:444:22)
at WebSocketShard.onMessage (D:\git\purgebot\node_modules\discord.js\src\client\websocket\WebSocketShard.js:301:10)
at WebSocket.onMessage (D:\git\purgebot\node_modules\ws\lib\event-target.js:132:16)

这里是同步角色部分的源代码（第 1 行 = 第 37 行）

const client = this.client;

if(message.member.guild.me.hasPermission('ADMINISTRATOR')) 

    var guild1 = client.guilds.fetch(args[0]); //guildid1
    var guild2 = client.guilds.fetch(args[1]); //guildid1

    var users1 = guild1.roles.fetch(args[2]).members; //guild1role
    var users2 = guild2.roles.fetch(args[3]).members; //guild2role

    users2.members.forEach(user => 
        user.remove(args[3]).catch(console.error);
        message.channel.send("removed role " + args[3] + " for " + user.id);
    )

    users1.members.forEach(user =>
        guild2.members.forEach(user2 => 
            if(user.id == user2.id) 
                user2.addRole(args[3]);
                message.channel.send("added role " + args[3] + " for " + user.id);
            
        )
    )

    message.channel.send("roles synced");
 else 
    message.channel.send("https://i.imgur.com/6cpffM4.jpg");

【参考方案1】：

GuildManager.fetch() 返回一个Promise，必须先解决它才能使用Guild 对象。 RoleManager.fetch()也是如此

// using `Promise.prototype.then()`

client.guilds.fetch(args[0]).then((guildid1) => 
 client.guilds.fetch(args[1]).then((guildid2) => 
  let users1, users2;
  guild1.roles.fetch(args[2]).then((role) => (users1 = role.members));
  guild2.roles.fetch(args[3]).then((role) => (users2 = role.members));
  // code...
 );
);

// using `async/await`
// **make sure your function is `async`**

const guild1 = await client.guilds.fetch(args[0]);
const guild2 = await client.guilds.fetch(args[1]);

const users1 = (await guild1.roles.fetch(args[2])).members;
const users2 = (await guild2.roles.fetch(args[3])).members;