strprfcrm/app/Models/Ttn.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Support\Facades\DB;

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

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

    public static function getNextTtnNumber(): int
    {
        return Setting::getInt(Setting::KEY_TTN_NEXT_NUMBER, static::detectNextTtnNumber()) ?? 1;
    }

    public static function reserveNextTtnNumber(): int
    {
        return DB::transaction(static function (): int {
            $setting = Setting::query()
                ->lockForUpdate()
                ->firstOrNew(['key' => Setting::KEY_TTN_NEXT_NUMBER]);

            $nextNumber = (int) ($setting->value ?: static::detectNextTtnNumber());

            $setting->value = (string) ($nextNumber + 1);
            $setting->save();

            return $nextNumber;
        });
    }

    private static function detectNextTtnNumber(): int
    {
        return (int) static::query()
            ->where('year', now()->year)
            ->max('ttn_number') + 1;
    }
}