php - Symfony 2 使用自定义反规范化器对嵌套对象进行反规范化

Question

Here我正在为 REST API 构建 Symfony SDK。大多数数据是嵌套有其他 JSON 对象的 JSON 对象。就像这里

{
    "id": "eng_pl",
    "name": "Premier League",
    "_links": {
        "self": {
            "href": "/tournaments/eng_pl"
        },
        "seasons": {
            "href": "/tournaments/eng_pl/seasons/"
        }
    },
    "coverage": {
        "id": "eng",
        "name": "England",
        "_links": {
            "self": {
                "href": "/territories/eng"
            }
        }
    }
}

反序列化必须生成一个与下面列出的代码生成的对象相同的对象:

$tournament = new Tournament();
$tournament->setId('eng_pl');
$tournament->setName('Premier League');

$coverage = new Territory();
$coverage->setId('eng');
$coverage->setName('England');

$tournament->setCoverage($coverage);

我正在使用自己的自定义反规范化器，位于锦标赛对象的反规范化器代码片段下方:

class TournamentDenormalizer implements DenormalizerInterface
{

    /**
     * @inheritdoc
     */
    public function supportsDenormalization($object, $type, $format = null)
    {

        if ($type != Tournament::class) {
            return false;
        }
        return true;
    }

    /**
     * @inheritdoc
     * @return Tournament
     */
    public function denormalize($object, $class, $format = null, array $context = array())
    {
        $tournament = new Tournament();
        $tournament->setId($object->id);
        $tournament->setName($object->name);

        if (isset($object->coverage)) {
            /** @var Territory $coverage */
            $coverage = ???; //HOWTO how to implement Territory denormalization here???
            $tournament->setCoverage(
                $coverage
            );
        }
            return $tournament;
    }
}

问题是我应该如何访问 TournamentDenormalizer 中的 TerritoryDe​​normalizer？我看到两个选项:

第一个(我现在正在使用)是将implements DenormalizerAwareInterface添加到denormalizer类的签名中，并依赖于Symfony\Component\Serializer\Serializer类:

$serializer = new Symfony\Component\Serializer\Serializer(
    [
        new TournamentDenormalizer(),
        new TerritoryDenormalizer()
    ], [
        new Symfony\Component\Serializer\Encoder\JsonDecode()
    ]
);
$serializer->deserialize($json, Tournament::class, 'json');

所以在 TournamentDeserializer 中它会像这样:

if (isset($object->coverage)) {
        /** @var Territory $coverage */
        $coverage = $this->denormalizer->denormalize(
            $object->coverage,
            Territory::class,
            $format,
            $context
        );
        $tournament->setCoverage(
            $coverage
        );
    }
}

第二种方法是显式注入(inject)必要的反规范化器

$tournamentDenormalizer = new TournamentDenormalizer();
$tournamentDenormalizer->setTerritoryDenormalizer(new TerritoryDenormalizer());

所以在 TournamentDeserializer 中它会像这样:

if (isset($object->coverage)) {
        /** @var Territory $coverage */
        $coverage = $this->territoryDenormalizer->denormalize(
            $object->coverage,
            Territory::class,
            $format,
            $context
        );
        $tournament->setCoverage(
            $coverage
        );
    }
}

哪种方法最好？有哪些可能的替代方法？

Answer 1

让规范化器实现 NormalizerAwareInterface (并最终使用 NormalizerAwareTrait)是正确的方法，此接口(interface)是针对此特定用例引入的。