rag/app/Models/Chat.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Concerns\HasUuids;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\HasMany;

class Chat extends Model
{
    use HasUuids;

    protected $fillable = ['text'];

    public function messages(): HasMany
    {
        return $this->hasMany(Message::class)->orderBy('created_at');
    }
}