fix(serializer): allow nullable to-many relations to normalize as null#8254
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soyuka merged 1 commit intoJun 5, 2026
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A property typed as a nullable collection of resources (e.g. ?array<Foo> or Collection|null) raised UnexpectedValueException during normalization because getAttributeValue() rejected any non-iterable value, including null. The to-one branch already accepted null; mirror that behavior on the to-many branch and return null when the property is nullable and the value is null. Fixes api-platform#7050
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Summary
AbstractItemNormalizer::getAttributeValue()rejected any non-iterable value on a to-many branch withUnexpectedValueException('Unexpected non-iterable value for to-many relation.')— includingnull. A property typed as a nullable collection of resources crashed during normalization. The to-one branch already accepted null; mirror that behavior on to-many and return null when the property is nullable.Reproduction
A resource exposing
?Collection<Item> $items = nullcrashed when serialized withitemsset to null.Test plan
Fixes #7050