class Person(db.Document): name = db.StringField()
class Todo(db.Document): description = db.StringField() query_class = Query
class Author(db.Document): name = db.StringField()
class Book(db.Document): title = db.StringField() author = db.DocumentField(Author) year = db.IntField()
class Book(db.Document): query_class = BookQuery title = db.StringField() year = db.IntField()