discord js，让提到的用户耳聋

Question

I'm probably misunderstanding exactly what's being returned by the members object here, but I'm attempting to test a deafen command within my bot - the documentation for discord.js states that the Message object contains a Mentions property that holds all the valid mentions within a sent message, from there, I can drill down a bit further and get to the Members property from within Mentions - which returns a collection of GuildMembers that have been mentioned in the message - which is what I want. The problems arises when I attempt to grab those GuildMember objects from within the collection that I get back - I'm not quite sure what I'm doing wrong, but I get back errors. The code I have is as follows:

module.exports = {
    name: 'deafen',
    cooldown: 5,
    description: 'Deafens mentioned user or users.',
    args: true,
    execute(message) {
        const taggedMembers = message.mentions.members;

        for(const member of taggedMembers) {
            member.setDeaf(true)
                .then(() => console.log(`Deafened ${member.displayName}`))
                .catch(console.error);
        }
    },
};

and I get back this error in my terminal window:

TypeError: member.setDeaf is not a function 
    at Object.execute (/home/tai/dev/FutabaBot/commands/admin/deafen.js:10:20)
    at Client.<anonymous> (/home/tai/dev/FutabaBot/FutabaBot.js:80:17)
    at Client.emit (events.js:210:5)
    at MessageCreateHandler.handle (/home/tai/dev/FutabaBot/node_modules/discord.js/src/client/websocket/packets/handlers/MessageCreate.js:9:34)     
    at WebSocketPacketManager.handle (/home/tai/dev/FutabaBot/node_modules/discord.js/src/client/websocket/packets/WebSocketPacketManager.js:105:65) 
    at WebSocketConnection.onPacket (/home/tai/dev/FutabaBot/node_modules/discord.js/src/client/websocket/WebSocketConnection.js:333:35)
    at WebSocketConnection.onMessage (/home/tai/dev/FutabaBot/node_modules/discord.js/src/client/websocket/WebSocketConnection.js:296:17)
    at WebSocket.onMessage (/home/tai/dev/FutabaBot/node_modules/ws/lib/event-target.js:120:16)
    at WebSocket.emit (events.js:210:5)
    at Receiver.receiverOnMessage (/home/tai/dev/FutabaBot/node_modules/ws/lib/websocket.js:789:20)

I'm not sure if it's necessary, but I can post the other pieces of code that relate to this - and the documentation for discord.js can be found here

Answer 1

The message.mentions.members returns a Collection of GuildMembers and a Snowflake (some unique identifier . A Collection is an extension of the Map class , where a map is an array with each item having a key and a value attribute.

When looping over a map, like you're doing with for(const member of taggedMembers) , each item (or member in your case) is a key and a value pair. Then you're trying to call the setDeaf method on that pair, which as you've seen doesn't work.

What you want is to only loop over the values in the collection. This can easily be done with a .forEach . I'll add some example code down below:

taggedMembers.forEach((member) => {
    member.setDeaf(true)
        .then(() => console.log(`Deafened ${member.displayName}`))
        .catch(console.error);
});

Give it a go and let me know if you run into any more issues.

EDIT: As slothiful pointed out in the comments, using a .forEach won't catch any Promise rejections even after attaching a .catch() . To fix this you can use the for... of loop but destructuring the pair. This can be seen in the example below:

for (let [, member] of taggedMembers) {
    member.setDeaf(true)
        .then(() => console.log(`Deafened ${member.displayName}`))
        .catch(console.error);
}