strprfcrm/app/Models/Ttn.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;

class Ttn extends Model
{
    protected $fillable = [
        'year',
        'ttn_number',
        'ttn_number_suffix',
        'order_number',
        'order_date',
        'order_sum',
        'skus',
        'file_id',
    ];

    public function file(): BelongsTo
    {
        return $this->belongsTo(File::class);
    }

    public static function getTtnNumber(): int
    {
        return Ttn::query()->where('year', now()->year)->orderBy('ttn_number', 'desc')->first()?->ttn_number ?? 0;
    }
}