<?php
use Illuminate\Support\Facades\Broadcast;
use App\Models\Conversation;

Broadcast::channel('App.Models.User.{id}', function ($user, $id) {
    return (int) $user->id === (int) $id;
});

Broadcast::channel('chat.{conversationId}', function ($user, $conversationId) {

    return Conversation::where('id', $conversationId)
        ->whereHas('users', function ($q) use ($user) {
            $q->where('user_id', $user->id);
        })
        ->exists();

});