需要帮助将 Bot 更新到 Discord.js v12

Question

我正在尝试更新此代码以使用 Discord.js v12。我遇到了一个错误，我对如何修复这个错误有点困惑。我已经更新了一些代码以使用 Discord.js v12。

TypeError: client.channels.fetch(...).send 不是函数

在客户端。 (/home/runner/Log/index.js:44:40) 在 Client.emit (events.js:314:20) 在 Client.EventEmitter.emit (domain.js:483:12) 在 MessageCreateAction.handle (/home/runner/Log/node_modules/discord.js/src/client/actions/MessageCreate.js:31:14) 在 Object.module.exports [as MESSAGE_CREATE] (/home/runner/Log/node_modules/discord.js/src/client/websocket/handlers/MESSAGE_CREATE.js:4:32) 在 WebSocketManager.handlePacket (/home/runner/Log/node_modules/discord.js/src/client/websocket/WebSocketManager.js:384:31) 在 WebSocketShard.onPacket (/home/runner/Log/node_modules/discord.js/src/client/websocket/WebSocketShard.js:444:22) 在 WebSocketShard.onMessage (/home/runner/Log/node_modules/discord.js/src/client/websocket/WebSocketShard.js:301:10) 在 WebSocket.onMessage (/home/runner/Log/node_modules/ws/lib/event-target.js:132:16)

const Discord = require('discord.js');
const client = new Discord.Client();
const { prefix, token, logsChannel } = require('./config.json');

client.once('ready', () => {
    console.log('I am alive!');
});

// Messages log
client.on('message', message => {
    // Function
    function isEmpty(collection) {
        for(var arg in collection) {
            if(collection.hasOwnProperty(arg))
                return false;
        }
        return true;
    }
    // Logs
    if(message.author.bot) return;
    let username = message.author.tag;
    let channel = message.channel.name;
    let server = message.channel.guild;
    var serverAvatarURL = message.guild.iconURL;
    var attachment = (message.attachments).array();
    if(isEmpty(attachment)) {
        var img = "";
    } else {
        var img = attachment[0].url;
    }
    let embed_send = new Discord.MessageEmbed()
        .setAuthor(username, message.author.avatarURL)
        .setColor('23c115')
        .setTitle("Message sent!")
        .setDescription(message.content + " " + img)
        .setImage(img)
        .setFooter("#" + channel)
        .setTimestamp();
    client.channels.fetch(logsChannel).send(embed_send);
});

// Message edit log
client.on("messageUpdate", async(oldMessage, newMessage) => {
    // Function
    function isEmpty(collection) {
        for(var arg in collection) {
            if(collection.hasOwnProperty(arg))
                return false;
        }
        return true;
    }
    // Logs
    if (oldMessage.content === newMessage.content) {
        return;
    }

    var attachment = (oldMessage.attachments).array();
    if(isEmpty(attachment)) {
        var img = "";
    } else {
        var img = attachment[0].url;
    }

    let embed_edit = new Discord.MessageEmbed()
        .setAuthor(oldMessage.author.tag, oldMessage.author.avatarURL)
        .setColor('2615c1')
        .setTitle("Message edited!")
        .addField("Old", oldMessage.content + " " + img, true)
        .addField("New", newMessage.content + " " + img, true)
        .setFooter("#" + oldMessage.channel.name)
        .setTimestamp();
    client.channels.fetch(logsChannel).send(embed_edit);
});

// Message delete log
client.on("messageDelete", async message => {
    // Function
    function isEmpty(collection) {
        for(var arg in collection) {
            if(collection.hasOwnProperty(arg))
                return false;
        }
        return true;
    }
    // Logs
    var attachment = (message.attachments).array();
    if(isEmpty(attachment)) {
        var img = "";
    } else {
        var img = attachment[0].url;
    }

    let embed_delete = new Discord.MessageEmbed()
    .setAuthor(message.author.tag, message.author.avatarURL)
    .setColor('c11515')
    .setTitle("Message deleted!")
    .setDescription(message.content + " " + img)
    .setImage(img)
    .setFooter("#" + message.channel.name)
    .setTimestamp();    
    client.channels.fetch(logsChannel).send(embed_delete);
});

client.login(token);

原始代码：

const Discord = require('discord.js');
const client = new Discord.Client();
const { prefix, token, logsChannel } = require('./config.json');

client.once('ready', () => {
    console.log('I am alive!');
});

// Messages log
client.on('message', message => {
    // Function
    function isEmpty(collection) {
        for(var arg in collection) {
            if(collection.hasOwnProperty(arg))
                return false;
        }
        return true;
    }
    // Logs
    if(message.author.bot) return;
    let username = message.author.tag;
    let channel = message.channel.name;
    let server = message.channel.guild;
    var serverAvatarURL = message.guild.iconURL;
    var attachment = (message.attachments).array();
    if(isEmpty(attachment)) {
        var img = "";
    } else {
        var img = attachment[0].url;
    }
    let embed_send = new Discord.RichEmbed()
        .setAuthor(username, message.author.avatarURL)
        .setColor('23c115')
        .setTitle("Message sent!")
        .setDescription(message.content + " " + img)
        .setImage(img)
        .setFooter("#" + channel)
        .setTimestamp();
    client.channels.get(logsChannel).send(embed_send);
});

// Message edit log
client.on("messageUpdate", async(oldMessage, newMessage) => {
    // Function
    function isEmpty(collection) {
        for(var arg in collection) {
            if(collection.hasOwnProperty(arg))
                return false;
        }
        return true;
    }
    // Logs
    if (oldMessage.content === newMessage.content) {
        return;
    }

    var attachment = (oldMessage.attachments).array();
    if(isEmpty(attachment)) {
        var img = "";
    } else {
        var img = attachment[0].url;
    }

    let embed_edit = new Discord.RichEmbed()
        .setAuthor(oldMessage.author.tag, oldMessage.author.avatarURL)
        .setColor('2615c1')
        .setTitle("Message edited!")
        .addField("Old", oldMessage.content + " " + img, true)
        .addField("New", newMessage.content + " " + img, true)
        .setFooter("#" + oldMessage.channel.name)
        .setTimestamp();
    client.channels.get(logsChannel).send(embed_edit);
});

// Message delete log
client.on("messageDelete", async message => {
    // Function
    function isEmpty(collection) {
        for(var arg in collection) {
            if(collection.hasOwnProperty(arg))
                return false;
        }
        return true;
    }
    // Logs
    var attachment = (message.attachments).array();
    if(isEmpty(attachment)) {
        var img = "";
    } else {
        var img = attachment[0].url;
    }

    let embed_delete = new Discord.RichEmbed()
    .setAuthor(message.author.tag, message.author.avatarURL)
    .setColor('c11515')
    .setTitle("Message deleted!")
    .setDescription(message.content + " " + img)
    .setImage(img)
    .setFooter("#" + message.channel.name)
    .setTimestamp();    
    client.channels.get(logsChannel).send(embed_delete);
});

client.login(token);

Answer 1

.fetch() 返回一个Promise。
因此，您需要等待.then() 的结果。

在您的代码中（假设 logsChannel 是一个 ID）：

client.channels
    .fetch(logsChannel)
    .then(fetchedChannel => fetchedChannel.send(embed_delete));

目前，您需要更新所有.fetches

Answer 2

正如 NullDev 提到的，.fetch() 返回一个承诺，因此需要先解决它。您可以使用.then() 和.catch() 方法或async/await。

与.then().catch():

client.channels
  .fetch(logsChannel)
  .then((ch) => ch.send(embed_send))
  .catch(console.error);

async/await也一样：

try {
  (await client.channels.fetch(logsChannel)).send(embed);
} catch (error) {
  console.log(error);
}

如果您有一个在三个不同处理程序中使用的函数（如isEmpty），您可以将其移出并只定义一次。虽然你甚至不需要这个。 message.attachments 返回邮件中的附件集合。集合有一个 .size 访问器属性，它返回集合中元素的数量。

检查是否有附件就像检查其大小一样简单：message.attachments.size > 0。

集合还有一个.first() 方法，它可以获取此集合中的第一个值。这意味着您可以像这样获取第一个附件的 URL：message.attachments.first().url。

另一个错误是message.author.avatarURL 不起作用，因为.avatarURL() 是一个方法，所以你应该调用它。您可能可以改用displayAvatarURL()，因为如果用户没有任何头像，它会返回用户的默认头像。

您可以在下面找到所有这些更改的代码：

const Discord = require('discord.js');
const client = new Discord.Client();
const { prefix, token, logsChannel } = require('./config.json');

client.once('ready', () => {
  console.log('I am alive!');
});

client.on('message', async (message) => {
  if (message.author.bot) return;
  let username = message.author.tag;
  let channel = message.channel.name;
  let img = message.attachments.size > 0 ? message.attachments.first().url : '';

  let embed = new Discord.MessageEmbed()
    .setAuthor(username, message.author.displayAvatarURL())
    .setColor('23c115')
    .setTitle('Message sent!')
    .setDescription(message.content + ' ' + img)
    .setImage(img)
    .setFooter('#' + channel)
    .setTimestamp();

  try {
    let log = await client.channels.fetch(logsChannel);
    log.send(embed);
  } catch (error) {
    console.log(error);
  }
});

client.on('messageUpdate', async (oldMessage, newMessage) => {
  if (oldMessage.content === newMessage.content) return;

  let img =
    oldMessage.attachments.size > 0 ? oldMessage.attachments.first().url : '';

  let embed = new Discord.MessageEmbed()
    .setAuthor(oldMessage.author.tag, oldMessage.author.displayAvatarURL())
    .setColor('2615c1')
    .setTitle('Message edited!')
    .addField('Old', oldMessage.content + ' ' + img, true)
    .addField('New', newMessage.content + ' ' + img, true)
    .setFooter('#' + oldMessage.channel.name)
    .setTimestamp();

  try {
    let log = await client.channels.fetch(logsChannel);
    log.send(embed);
  } catch (error) {
    console.log(error);
  }
});

client.on('messageDelete', async (message) => {
  let img = message.attachments.size > 0 ? message.attachments.first().url : '';

  let embed = new Discord.MessageEmbed()
    .setAuthor(message.author.tag, message.author.displayAvatarURL())
    .setColor('c11515')
    .setTitle('Message deleted!')
    .setDescription(message.content + ' ' + img)
    .setImage(img)
    .setFooter('#' + message.channel.name)
    .setTimestamp();

  try {
    let log = await client.channels.fetch(logsChannel);
    log.send(embed);
  } catch (error) {
    console.log(error);
  }
});

client.login(token);