Question 263560 in PHP Question posted in
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Php – SYMFONY DESERIALIZER ERROR: The type of the attribute for class must be one of "Object[]" but ("array" given)

I have a Tags model (not an entity) with a child Tag model array property.

class Tags
{
    private array $tags;

    public function addTag(Tag $tag): bool{}

    public function removeTag(Tag $tag): bool{}

    public function setTags(array $tags): self{}

    public function getTags(): array{}

And it was correctly serialized.

{
    "tags": [
        {
            "slug": "a_tag",
            "name": "A Tag",
            "description": "This is a nice tag!"
        }
    ]
}

To deserialize I do:

use SymfonyComponentPropertyInfoExtractorReflectionExtractor;
use SymfonyComponentSerializerEncoderJsonEncode;
use SymfonyComponentSerializerEncoderJsonEncoder;
use SymfonyComponentSerializerNormalizerObjectNormalizer;
use SymfonyComponentSerializerSerializer;


        $json = file_get_contents($this->fileName);
        $encoders = [new JsonEncoder()];
        $normalizers = [new ObjectNormalizer(null, null, null, new ReflectionExtractor())];
        $serializer = new Serializer($normalizers, $encoders);

        return $serializer->deserialize($json, Tags::class, 'json');

But when I try to deserialize, I get an error:

The type of the "tags" attribute for class "AppModelTags" must be
one of "AppModelTag[]" ("array" given).

This doesn’t even make sense. It’s not possible to type an array in PHP, so why it’s giving this error?

I think this is somewhat related to Recursive Denormalization and Type Safety, but I don’t get how to fix it.

Thanks in advance

Tags:

2

Answers


  1. Chosen as BEST ANSWER
    0

    You need to use use an ArrayDenormalizer.

    use SymfonyComponentSerializerNormalizerArrayDenormalizer;

        $json = file_get_contents($this->fileName);

        $encoders = [new JsonEncoder()];
        $normalizers = [
            new ArrayDenormalizer(),
            new ObjectNormalizer(null, null, null, new ReflectionExtractor())
        ];
        $serializer = new Serializer($normalizers, $encoders);

        return $serializer->deserialize($json, Tags::class, 'json');

  2. 0

    Try this configuration in Symfony yaml config.

    services:
  property_normalizer:
    class: SymfonyComponentSerializerNormalizerPropertyNormalizer
    tags: [ serializer.normalizer ]
    arguments:
      $propertyTypeExtractor: '@SymfonyComponentPropertyInfoPropertyDescriptionExtractorInterface'
  object_normalizer:
    class: SymfonyComponentSerializerNormalizerObjectNormalizer
    tags: [ serializer.normalizer ]
  get_set_method_normalizer:
    class: SymfonyComponentSerializerNormalizerGetSetMethodNormalizer
    tags: [ serializer.normalizer ]
  array_denormalizer:
    class: SymfonyComponentSerializerNormalizerArrayDenormalizer
    tags: [ serializer.denormalizer ]

    It works good with collections.

        /**
     * @var Tag[] Tags
     */
    #[OAProperty(type: 'array', items: new OAItems(ref: '#/components/schemas/Tag'))]
    #[AssertValid(traverse: true)]
    protected array $tags;
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