ExpediaGroup / graphql-kotlin

Library Version
7.0.1

Describe the bug
If the schema generator calls didGenerateGraphQLType on an entity with a @key selection set that contains another object, and that object has not yet been added to the schema, then the call to GraphQLTypeUtil.unwrapAll(currentFieldType) in validateFieldSetSelection throws the error

graphql-kotlin/generator/graphql-kotlin-federation/src/main/kotlin/com/expediagroup/graphql/generator/federation/validation/validateFieldSetSelection.kt

Line 39 in 742b49f

    
           val isExternal = isExternalPath || GraphQLTypeUtil.unwrapAll(currentFieldType).isExternalPath() || currentField.isExternalType()

java.lang.ClassCastException: class graphql.schema.GraphQLTypeReference cannot be cast to class graphql.schema.GraphQLUnmodifiedType

This was not an issue in v6 (or the last version of 7 alpha we used, 7.0.0-alpha.4), and I'm guessing it is from this commit: 5cad531#diff-60a728ab48e454e36c195fd120482f55fe1a9b970006c18cf4cf03bcdb214e05

To Reproduce
This schema gets the schema generator to try to add Child before Parent, which causes the issue:

data class Parent(
  val id: ID,
  val someChild: Child,
)

@KeyDirective(fields = FieldSet("parent { id }"))
data class Child(
  val parent: Parent,
)

class Query {
  fun parent(): Parent = TODO()
}

val schema = toFederatedSchema(
  config = FederatedSchemaGeneratorConfig(
    supportedPackages = listOf("mdg.auth.repro"),
    hooks = FederatedSchemaGeneratorHooks(emptyList()),
  ),
  queries = listOf(TopLevelObject(Query()))
)

Expected behavior
The schema to be generated instead of breaking.

Regression from v6: 'didGenerateGraphQLType' fails if the Entity has a @key that is still a GraphQLTypeReference