Serializer return an error 500 (no supporting normalizer found)-CodePudding

I want transform an object to JSON in my Symfony project, I use the SerializerInterface in my method.

Here is my method:

     /**
     * @Route("{token}", name="list")
     */
    public function list(ProductList $productList, ProductRepository $productRepository, SerializerInterface $serializer): Response
    {
        $productListJSON = $serializer->serialize($productList, 'json');
        dd($productListJSON);

        return $this->json($productListJSON);
    }

This dd(); return me an error 500 :

Could not normalize object of type "App\Entity\ProductList", no supporting normalizer found.

I have add 'use' in my Controller, I have test to add Group in the entity 'ProductList' and test with this code, but same result : $productListJSON = $serializer->serialize($productList, 'json', ['groups' => 'list_json']);

I don't understand why I have this error.

Thanks for the help

CodePudding user response：

You forgot to initialize your serializer with the proper Normalizer.

Modify your code to add JsonEncoder as encoder and the recommended ObjectNormalizer as normalizer:

use Symfony\Component\Serializer\Encoder\JsonEncoder;
use Symfony\Component\Serializer\Normalizer\ObjectNormalizer;
use Symfony\Component\Serializer\Serializer;

 /**
 * @Route("{token}", name="list")
 */
public function list(ProductList $productList, ProductRepository $productRepository): Response
{
    $encoders = [new JsonEncoder()];
    $normalizers = [new ObjectNormalizer()];
    $serializer = new Serializer($normalizers, $encoders);

    $productListJSON = $serializer->serialize($productList, 'json');
    dd($productListJSON);

    return $this->json($productListJSON);
}

See more in the documentation.