我有两个
objects
,并且具有 Parent
-Child
关系。对于每个 object
,我都有一个自定义 normalizer
,如下所示:
use Symfony\Component\Serializer\Normalizer\scalar;
class ChildNormalizer
{
public function normalize($object, $format = null, array $context = array())
{
return [
"name" => $object->getName(),
"age" => $object->getAge(),
...
];
}
public function supportsNormalization($data, $format = null)
{
return ($data instanceof Child) && is_object($data);
}
}
use Symfony\Component\Serializer\Encoder\NormalizationAwareInterface;
use Symfony\Component\Serializer\Normalizer\NormalizerAwareTrait;
use Symfony\Component\Serializer\Normalizer\NormalizerInterface;
use Symfony\Component\Serializer\Normalizer\scalar;
class ParentNormalizer implements NormalizerInterface, NormalizationAwareInterface
{
use NormalizerAwareTrait;
public function normalize($object, $format = null, array $context = array())
{
return [
...
"children" => array_map(
function ($child) use ($format, $context) {
return $this->normalizer->normalize($child);
}, $object->getChildren()
),
...
];
}
public function supportsNormalization($data, $format = null)
{
return ($data instanceof Parent) && is_object($data);
}
}
当我尝试序列化
Parent
object
进而标准化 Child
object
时,我得到以下异常:
在 null 上调用成员函数 normalize()
我是否错过了配置步骤,或者我到底做错了什么?
解决了问题,我实施了错误的
*AwareInterface
。
如果
ParentNormalizer
实现 NormalizerAwareInterface
而不是 NormalizationAwareInterface
,则代码可以完美运行。
use Symfony\Component\Serializer\Encoder\NormalizerAwareInterface;
use Symfony\Component\Serializer\Normalizer\NormalizerAwareTrait;
use Symfony\Component\Serializer\Normalizer\NormalizerInterface;
use Symfony\Component\Serializer\Normalizer\scalar;
class ParentNormalizer implements NormalizerInterface, NormalizerAwareInterface
{
...
}