Flask项目里面，如何同时使用MySQL和MongoDB，Sqlalchemy和MongoEngine？

Question

Flask项目里面，如何同时使用MySQL和MongoDB，Sqlalchemy和MongoEngine？

from mongoengine import *  
import datetime

class Page(Document):  
    title = StringField(max_length=200, required=True)  
    date_modified = ateTimeField(default=datetime.datetime.now)
    author = xxxx????【这里怎么关联到User呢？？ 手工？】


=======
from sqlalchemy import Column, Integer, String
class User(Base):
    __tablename__ = 'users'
    id = Column(Integer, primary_key=True)
    name = Column(String)
    fullname = Column(String)
    password = Column(String)

Answer 1

The two databases cannot reference each other. Do it manually. Write a property for Page, such as get_user or something.

Answer 2

Isn’t it okay to put the functions in different packages?