Stevebauman\Inventory\Traits\AssemblyTrait::validatePartAgainstList PHP Метод

    protected function validatePartAgainstList($value, $key)
    {
        if ((string) $key === (string) $this->getKeyName()) {
            if ((int) $value === (int) $this->getKey()) {
                $message = 'The inserted part exists inside the assembly tree. An item cannot be an assembly of itself.';
                throw new InvalidPartException($message);
            }
        }
    }