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

<?php

namespace App\Models;

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

class ContactMessage extends Model
{
    //
    use HasFactory;
    use SoftDeletes;

    protected $fillable = [
        'name',
        'email',
        'message',
        'category_id',
        'status_id',
    ];
    
    public function scopeNew(Builder $query): void
    {
        $query->whereHas('status', function ($q) {
            $q->where('name', 'Новое');
        });
    }

    public function category()
    {
        return $this->belongsTo(Category::class);
    }

    public function status()
    {
        return $this->belongsTo(Status::class);
    }

    public function notes()
    {
        return $this->morphMany(Note::class, 'noteable');
    }
}