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HeaderParameter constraint-validators receive array value by default #8499
Description
API Platform version(s) affected: 4.3.17
Description
The symfony constraint validators e.g. Symfony\Component\Validator\Constraints\NotBlankValidator receive array value by default. Because of that if we pass empty string then validation does not work. Is this a bug or a feature?
How to reproduce
parameters: [
'foo' => new HeaderParameter(
required: true,
constraints: [new NotBlank(message: 'foo missing from header')]
),
],Possible Solution
parameters: [
'foo' => new HeaderParameter(
required: true,
constraints: [new NotBlank(message: 'foo missing from header')],
nativeType: new BuiltinType(typeIdentifier: TypeIdentifier::STRING)
),
],Additional Context
MR to improve doc: api-platform/docs#2322
Activity
fix(state): treat single-value header parameters as scalar
fix(state): treat single-value header parameters as scalar
soyuka commentedon Sep 29, 2026
It is correct to need to add the nativeType for this, maybe that we should find a more user-friendly way of declaring that ? Or just a documentation PR ? I'm thinking a new
SingularHeaderParameter(or maybe a better name ^^).feat(metadata): add ScalarHeaderParameter (api-platform#8679)