Nested field resolver about ariadne HOT 4 CLOSED

from ariadne import ObjectType, QueryType
from ariadne import gql
from ariadne import graphql_sync
from ariadne import make_executable_schema
from graphql import GraphQLResolveInfo

GRAPHQL_SCHEMA = gql('''
type Query {
    sub: SubQuery!
}

type SubQuery {
    hello: String!
}
''')


Query = QueryType()


@Query.field('sub')
def resolve_sub(*_):
    return SubQuery


SubQuery = ObjectType('SubQuery')

@SubQuery.field('hello')
def resolve_hello(_, info: GraphQLResolveInfo):
    return 'hi'