Hi,

I'm trying to obtain specific directives of all fields in a custom ExecutionStrategy before I execute the query. This would be used to deduce if a query is cacheable, and if we should even consider checking the cache.

Directive looks like this:

directive @cacheControl(
  maxAge: Int!
  staleWhileRevalidate: Int!
) on FIELD_DEFINITION | OBJECT | INTERFACE | UNION

I tried a few things in the execute function using the provided parameters: ExecutionStrategyParameters.

1. Reading directives from the field ~ these always seem to be empty

 parameters.fields.subFieldsList.forEach { mergedField ->
        mergedField.fields.forEach {
            println(it.directives)
        }
    }

2. Reading directives manually ~ this works for top level field, but having some issues with nested fields. Also it looks wrong, given that the parentType is tied to the execution and is not on field leve.

val parentType =
parameters.executionStepInfo.unwrappedNonNullType as GraphQLObjectType
parameters.fields.subFieldsList.forEach { mergedField ->
  mergedField.fields.forEach {
      val fieldDef =
          getFieldDef(executionContext.graphQLSchema, parentType, it)
  
      println("${it.name}: ${CacheControlPolicy.fromDirectiveContainer(fieldDef)}")
  }
}

Any help would be appreciated.