有个示例是这样的,但是没看懂区别:
from mongoengine import *
class User(Document):
name = StringField()
class Comment(EmbeddedDocument):
title = StringField()
text = StringField()
class Post(Document):
title = StringField()
author = ReferenceField(User)
comments = ListField(EmbeddedDocumentField(Comment))
顾名思义,EmbeddedDocument是包含在父Document里的一组数据,没有单独的Collection。
ReferenceDocument有自己独立的Collection,引用它的Docuemnt中只包含一个Id