从类内部加载MongoEngine文档

from mongoengine import Document, EmbeddedDocument, fields

class Address(EmbeddedDocument):
    street = fields.StringField()
    city = fields.StringField()
    state = fields.StringField()

class Person(Document):
    name = fields.StringField()
    age = fields.IntField()
    address = fields.EmbeddedDocumentField(Address)

# 创建一个Person对象并保存到数据库
person = Person(name="John Doe", age=30, address=Address(street="123 Main St", city="New York", state="NY"))
person.save()

# 从数据库中获取Person对象并访问嵌入式的Address文档
person = Person.objects.first()
print(person.name)
print(person.address.street)
print(person.address.city)
print(person.address.state)