出现错误：“TypeError：无法读取未定义的属性‘通道’”答案

【问题标题】：Getting Error: "TypeError: Cannot read property 'channels' of undefined"出现错误：“TypeError：无法读取未定义的属性‘通道’”
【发布时间】：2021-11-17 05:23:39
【问题描述】：

这是我的代码：

module.exports = {
    name: 'suggestions',
    aliases: ['suggest'],
    execute(message, args, cmd, client, discord) {
        let channel = message.guild.channel.cache.find(ch=>ch.id==='890313569260937247')
        if(!channel) return message.channel.send({ content: 'There is no suggestion channel on this Server!' });

        let messageArgs = args.join(' ')
        const embed = new Discord.MessageEmbed()
        .setColor('#008000')
        .setAuthor(message.author.tag)
        .setDescription(messageArgs)
        .setTitle(`${message.author.tag} has a suggestion!!`)

        message.channel.send({ embeds: [embed] })
    }
}

我基本上是用我的命令处理程序创建一个命令，执行一个建议命令，用户的参数将在 MessageEmbed 中发送。

如果我运行实际的命令，就会出现这个错误：

TypeError: Cannot read property 'channel' of undefined
    at Object.execute (D:\Programming\Workspaces\Discord Bots\Mita Bot v1\commands\suggestions.js:5:37)
    at module.exports (D:\Programming\Workspaces\Discord Bots\Mita Bot v1\events\guild\message.js:11:25)
    at Client.emit (node:events:394:28)
    at MessageCreateAction.handle (D:\Programming\Workspaces\Discord Bots\Mita Bot v1\node_modules\discord.js\src\client\actions\MessageCreate.js:31:18)
    at Object.module.exports [as MESSAGE_CREATE] (D:\Programming\Workspaces\Discord Bots\Mita Bot v1\node_modules\discord.js\src\client\websocket\handlers\MESSAGE_CREATE.js:4:32)
    at WebSocketManager.handlePacket (D:\Programming\Workspaces\Discord Bots\Mita Bot v1\node_modules\discord.js\src\client\websocket\WebSocketManager.js:345:31)
    at WebSocketShard.onPacket (D:\Programming\Workspaces\Discord Bots\Mita Bot v1\node_modules\discord.js\src\client\websocket\WebSocketShard.js:443:22)
    at WebSocketShard.onMessage (D:\Programming\Workspaces\Discord Bots\Mita Bot v1\node_modules\discord.js\src\client\websocket\WebSocketShard.js:300:10)
    at WebSocket.onMessage (D:\Programming\Workspaces\Discord Bots\Mita Bot v1\node_modules\discord.js\node_modules\ws\lib\event-target.js:132:16)
    at WebSocket.emit (node:events:394:28)

【问题讨论】：

guild 是Message 的可选属性：The guild the message was sent in (if in a guild channel) 所以这表明您正在登录的消息不是在公会频道中发送的。

标签： javascript node.js discord.js

【解决方案1】：

作为t.niese said in their comment，Message#guild 可以是null。如果是message.guild === null，则表示该消息是在 DM 中发送的。

首先检查消息是否在公会中发送：

if (!message.guild)
  return message.channel.send('This command can only be used in a server!')

const channel = message.guild.channels.get('890313569260937247')
if (!channel)
  return message.channel.send('There is no suggestion channel on this Server!')

其他几点：

Guild 上没有 channel 属性；请改用channels。
您可以使用Collection#get通过其ID获取频道（无需使用.find(c => c.id === someId)。
您可以直接在send 中使用字符串：channel.send('the message') 而不是channel.send({ content: 'the message' })。

【讨论】：

【解决方案2】：

'channel' 不是 Guild 类的属性，您可能指的是 Guild#channels，它返回 GuildChannelManager 的必要类型。

【讨论】：