In the Flask project, how to use MySQL and MongoDB, Sqlalchemy and MongoEngine at the same time?

  mongodb, question

In the Flask project, how to use MySQL and MongoDB, Sqlalchemy and MongoEngine at the same time?

from mongoengine import *
 import datetime
 
 class Page(Document):
 title = StringField(max_length=200, required=True)
 date_modified = ateTimeField(default=datetime.datetime.now)
 author = xxxx?  ?  ?  ?  [How does this relate to User?  ?  Manual?  】
 
 
 =======
 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)

Two kinds of databases, can’t refer to each other. Let’s do it manually. Write Page a property, such as get_user or something.