另一个选择是MongoEngine。MongoEngine的ORM与Django使用的ORM非常相似。
示例（来自教程）：
class Post(document): title = StringField(max_length=120, required=True) author = ReferenceField(User)class TextPost(Post): content = StringField()class ImagePost(Post): image_path = StringField()class linkPost(Post): link_url = StringField()
