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Call scalar coerceUserInput before coerceOutput #993

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Call scalar coerceUserInput before coerceOutput #993

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6 changes: 5 additions & 1 deletion modules/core/src/main/scala/sangria/execution/FutureResolver.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -1405,7 +1405,11 @@ private[execution] class FutureResolver[Ctx](
if (isUndefinedValue(value))
None
else {
val coerced = scalar.coerceOutput(value, marshaller.capabilities)
val corcedInput = scalar
.coerceUserInput(value)
// Do we need a specific exepction here?
.fold(e => throw new ValidationError(Vector(e), exceptionHandler), identity)
val coerced = scalar.coerceOutput(corcedInput, marshaller.capabilities)
Comment on lines +1408 to +1412
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Throwing an exception here because the whole block is protected by try/catch


if (isUndefinedValue(coerced)) {
None
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2 changes: 1 addition & 1 deletion modules/core/src/main/scala/sangria/schema/ResolverBasedAstSchemaBuilder.scala
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Expand Up @@ -587,7 +587,7 @@ object ResolverBasedAstSchemaBuilder {
case v: String => safe(v.toDouble, "Float", value)
case _ => invalidType("Float", value)
}
case _ => coerced
case _ => t.coerceUserInput(coerced).fold(e => invalidType(t.name, value), identity)
}
}

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14 changes: 11 additions & 3 deletions modules/core/src/test/scala/sangria/marshalling/IonSupportSpec.scala
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Expand Up @@ -40,6 +40,7 @@ class IonSupportSpec extends AnyWordSpec with Matchers with FutureResultSupport
else dateFormat.format(d),
coerceUserInput = {
case s: String => parseDate(s)
case d: Date => Right(d)
case _ => Left(DateCoercionViolation)
},
coerceInput = {
Expand All @@ -51,13 +52,20 @@ class IonSupportSpec extends AnyWordSpec with Matchers with FutureResultSupport
val BlobType = ScalarType[Array[Byte]](
"Blob",
coerceOutput = (d, _) => d,
coerceUserInput = _ => Left(BinaryCoercionViolation),
coerceInput = _ => Left(BinaryCoercionViolation))
coerceUserInput = {
case bs: Array[Byte] => Right(bs)
case _ => Left(BinaryCoercionViolation)
},
coerceInput = _ => Left(BinaryCoercionViolation)
)

val ClobType = ScalarType[Array[Byte]](
"Clob",
coerceOutput = (d, _) => d,
coerceUserInput = _ => Left(BinaryCoercionViolation),
coerceUserInput = {
case bs: Array[Byte] => Right(bs)
case _ => Left(BinaryCoercionViolation)
},
coerceInput = _ => Left(BinaryCoercionViolation),
scalarInfo = Set(IonClobScalar)
)
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1 change: 1 addition & 0 deletions modules/core/src/test/scala/sangria/schema/CustomScalarSpec.scala
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Expand Up @@ -30,6 +30,7 @@ class CustomScalarSpec extends AnyWordSpec with Matchers {
coerceOutput = (d, _) => dateFormat.format(d),
coerceUserInput = {
case s: String => parseDate(s)
case d: Date => Right(d)
case _ => Left(DateCoercionViolation)
},
coerceInput = {
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1 change: 1 addition & 0 deletions modules/core/src/test/scala/sangria/schema/ResolverBasedAstSchemaBuilderSpec.scala
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Expand Up @@ -34,6 +34,7 @@ class ResolverBasedAstSchemaBuilderSpec extends AnyWordSpec with Matchers with F
"UUID",
coerceOutput = (v, _) => v.toString,
coerceUserInput = {
case uuid: UUID => Right(uuid)
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I try to understand:
coerceUserInput is now called twice:

  • the first time to parse the user input as String into a UUID
  • the second time to confirm that a UUID is a valid value
    ?

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@filosganga filosganga Apr 16, 2023 •
edited
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No it is not called, twice, but I have spent a bit of time looking at Apollo implementation, and I think, I would just need to change the scalars rather than Sangria.

In Apollo the scalar are represented by 3 functions:

  • serialize it is the same as coerceOutput, it coerces the scalar to a JSON representation
  • parseLiteral it is the same as coerceInput that is bit misleading, it basically coerces and hardcoded value into the scalar type
  • parseValue it is the same as coerceUserInput that basically coerces the values coming from the users via not hardcoded variables.

When you have an untyped underlying model, like JSON, the serialize function should take care also of parsing the type from the underlying model.

I will investigate more about that and maybe drop this PR in favour of a documentation one.

case s: String => parseUuid(s)
case _ => Left(UUIDViolation)
},
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