Send custom join or leave group messages

Documentation
1

Hello There,
I want to send a custom message when a user join group.
But my code is not working, i guess it’s because channel id,
how can I find channel id of group?
this is my server code:

main.ts

    initializer.registerAfterJoinGroup(afterJoinGroup);

hooks.ts

function afterJoinGroup(ctx: nkruntime.Context, logger: nkruntime.Logger, nk: nkruntime.Nakama, data: void, request: nkruntime.JoinGroupRequest) {
    patchMetadata(nk, ctx.userId, {guildJoinDate: new Date()});

    if (request.groupId == undefined)
        return;
    let user = nk.usersGetId([ctx.userId])[0];
    nk.channelMessageSend(request,{
        messageType:3,
        displayName: user.displayName,
        mainMessage:"",
        reportedList:[],
        isDeleted: false,
        createdTime: new Date(),
        channelId:"",
        messageId:"",
        isSelfMessage:false
    } , ctx.userId, ctx.username, true);
}
function getChannelIdOfTeam(groupId: string) {
    return "3." + groupId + "..";
}
2

Hello @Ahmadrezadl,

You should use the channelIdBuild function to build the channelId.

Best.