fix(symfony): keep error serialization mapping when enable_attributes is disabled#8231
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soyuka merged 1 commit intoJun 3, 2026
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… is disabled When `framework.serializer.enable_attributes: false`, Symfony registers its built-in attribute loader with `allowAnyClass: false` and no mapped classes, so it returns early for every class. As a result, api-platform's `Error` and `ValidationException` lose their `#[Groups]`, `#[SerializedName]`, and `#[Ignore]` metadata, and the problem/hydra/json:api error normalizers emit an empty payload. Register a dedicated `AttributeLoader` in `serializer.mapping.chain_loader` (and the cache warmer) that hard-codes the api-platform error classes via the `mappedClasses` argument. The loader runs regardless of the global `enable_attributes` flag, so error responses keep their structure without re-enabling attribute discovery for user classes. Fixes api-platform#8174
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Summary
When
framework.serializer.enable_attributes: false, Symfony's attribute loader is configured with no mapped classes and returns early for every class, so api-platform's Error and ValidationException lose the#[Groups]/#[SerializedName]/#[Ignore]metadata that the error normalizers rely on, leaving error responses empty.Reproduction
Set
framework.serializer.enable_attributes: falseon the demo project and trigger a validation error — the response body is empty instead of the structured error payload.Test plan
Fixes #8174