[Voucher] Solution for a unique voucher code generation

[albertmueller]

Q	A
Bug report?	no
Feature request?	yes
BC Break report?	no
RFC?	yes/no

As discussed, try to generate a code until it is unique, currently i got a exception that the code already exists.

My current solution:

        $uniqueCode = false;
        while (!$uniqueCode) {
            $codes = $this->cartPriceRuleVoucherCodeGenerator->generateCodes($voucherCodeConfiguration);
            $code = reset($codes);

            $existingCode = $this->cartPriceRuleVoucherRepository->findByCode($code->getCode());
            if (!$existingCode) {
                $uniqueCode = true;
            }
        }

[dlhck]

Great solution. Maybe we can also implement a user feedback in the backend to show those codes which would have been duplicates.

[dpfaffenbauer]

@davidhoeck ?