query.py

class Query(graphene.ObjectType):
    node = relay.Node.Field()
    
    user = graphene.Field(User,
        id=graphene.String(required=True))

    def resolve_user(
        args,
        info,
        id, **kwargs):
        
        user = SQLAlchemyQuery(id) # return UserModel from sqlAlchemy
        return user


schema = graphene.Schema(query=Query)