How to query nested object in GraphQL? - graphql

Question

I am new to GraphQL and MongoDB and try to build a backend using both.
I have followed the sample on https://github.com/graphql-python/graphene-mongo/tree/master/examples/flask_mongoengine and somehow able to build one. But I am not able to query the nested object, I am not sure if it is the issue of my code or my query?
models.py
from mongoengine import connect, Document, EmbeddedDocument
from mongoengine.fields import (
StringField,
IntField,
ReferenceField,
ListField,
EmbeddedDocumentField,
ObjectIdField
)
class author(Document):
meta = {'db_alias': 'db', 'collection': 'author'}
acronym = StringField()
name = StringField()
notes = StringField()
class author_list(EmbeddedDocument):
sequence = IntField()
author = ReferenceField(author)
class book(Document):
meta = {'db_alias': 'db', 'collection': 'book'}
publish_date = StringField()
title = StringField()
author_list = ListField(EmbeddedDocumentField(author_list))
category = StringField()
schema.py
import graphene
from graphene.relay import Node
from graphene_mongo import MongoengineConnectionField, MongoengineObjectType
from models import author as AuthorModel
from models import author_list as AuthorListModel
from models import book as BookModel
class AuthorType(MongoengineObjectType):
class Meta:
model = AuthorModel
interfaces = (Node,)
class AuthorListType(MongoengineObjectType):
class Meta:
model = AuthorListModel
interfaces = (Node,)
class BookType(MongoengineObjectType):
class Meta:
model = BookModel
interfaces = (Node,)
class Query(graphene.ObjectType):
node = Node.Field()
books = MongoengineConnectionField(BookType)
authors = MongoengineConnectionField(AuthorType)
schema = graphene.Schema(query=Query, types=[BookType, AuthorListType, AuthorType])
Query
{
books {
edges {
node {
authorList{
edges {
node {
sequence
author(acronym: "CC") {
name
}
}
}
}
}
}
}
}
And I receive the following error:
{
"errors": [
{
"message": "Unknown argument \"acronym\" on field \"author\" of type \"AuthorListType\".",
"locations": [
{
"line": 10,
"column": 20
}
]
}
]
}