Adding a property to a collection query response

[PaulCombal]

Hello,

I would like to add the total number of entities, regardless of the filters, to the reponse of a collection query (ex: GET /products).

This documentation walks us through the steps to add a new key to an entity result, but how about a collection?

Using the same code than the above documentation (slightly updated for Symfony 7), I tried:

  App\Serializer\ApiCollectionNormalizer:
    decorates: 'api_platform.hydra.normalizer.collection'

But it gives me:

Typed property ApiPlatform\\Serializer\\AbstractCollectionNormalizer::$normalizer must not be accessed before initialization

As soon as I use ->normalize on the decorated Normalizer.

I must admit I don't exactly know what I'm doing.

Is there any way to achieve this properly?

Thank you