使用自定义非规范化器对嵌套对象进行Symfony 2非规范化

Question

在这里，我正在为REST API构建Symfony SDK。 大多数数据都是具有嵌套的其他JSON对象的JSON对象。 像这儿

{
    "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等的对象：

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

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

$tournament->setCoverage($coverage);

我正在使用我自己的自定义Denormalizers，在Tournament对象的denormalizer代码片段下面：

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;
    }
}

问题是如何在TournamentDenormalizer中访问TerritoryDe​​normalizer？ 我看到两个选择：

第一个 （我现在正在使用）是将implements DenormalizerAwareInterface添加到denormalizer类的签名并依赖于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它会像这里：

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

第二种方法是明确地注入必要的非规范化器

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

所以在TournamentDeserializer它会像这里：

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？ 有哪些替代方法可行？

Answer 1

使你的规范化器实现NormalizerAwareInterface （并最终使用NormalizerAwareTrait ）是要走的路，这个接口已经为这个特定的用例引入。