schema.py

import graphene as g
from graphql.execution.executors.asyncio import AsyncioExecutor



class Author(g.ObjectType):
    """This is a human being."""
    id = g.Int(description='The primary key in the database')
    first_name = g.String()
    last_name = g.String()
    age = g.Int()
    # we can't use g.List(Book)
    # directly since it's not
    # yet defined
    books = g.List(lambda: Book)


class Book(g.ObjectType):
    """A book, written by an author."""
    id = g.Int(description='The primary key in the database')
    title = g.String(description='The title of the book')
    published = g.String(description='The date it was published')
    author = g.Field(Author)