strprfcrm/app/Models/PricingCode.php

<?php

namespace App\Models;

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

class PricingCode extends Model
{
    const TYPE_TSN_NUMBER = 'tsn_number';
    const TYPE_PRICING_CODE = 'pricing_code';

    protected $fillable = [
        'type',
        'code',
        'description',
    ];

    public function spareParts(): BelongsToMany
    {
        return $this->belongsToMany(SparePart::class, 'spare_part_pricing_code')
            ->withTimestamps();
    }

    /**
     * Получить расшифровку для № по ТСН
     */
    public static function getTsnDescription(?string $code): ?string
    {
        if (!$code) {
            return null;
        }

        return self::where('type', self::TYPE_TSN_NUMBER)
            ->where('code', $code)
            ->value('description');
    }

    /**
     * Получить расшифровку для шифра расценки
     */
    public static function getPricingCodeDescription(?string $code): ?string
    {
        if (!$code) {
            return null;
        }

        return self::where('type', self::TYPE_PRICING_CODE)
            ->where('code', $code)
            ->value('description');
    }

    /**
     * Создать или обновить запись справочника
     */
    public static function createOrUpdate(string $type, string $code, string $description): void
    {
        self::updateOrCreate(
            ['type' => $type, 'code' => $code],
            ['description' => $description]
        );
    }
}