laravel-beginning/form-app-with-data/app/Models/Note.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Factories\HasFactory;

class Note extends Model
{
    use HasFactory;
    protected $fillable = ['body'];
    
    public function noteable() { return $this->morphTo(); }
}