docs(errors): warn that exception_to_status is not merged with defaults#2291
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soyuka merged 2 commits intoJun 11, 2026
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Declaring a custom exception_to_status mapping replaces the built-in one entirely rather than merging. Omitting the default handlers makes serializer exceptions (non-existing relation item, invalid backed enum) fall through to the 500 fallback instead of 400. Closes #6116
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Documentation
Closes api-platform/core#6116
When a custom
exception_to_statusmapping is declared, it replaces the built-in defaults entirely instead of merging with them. If a user omits the default handlers, exceptions previously mapped to400— notablySymfony\Component\Serializer\Exception\ExceptionInterfacethrown when denormalizing a relation to a non-existing item, or an invalid backed enum value — fall through to the500fallback.The example already carried inline "keep those lines" comments; this adds an explicit warning callout explaining why the default lines must be kept.