如何在SQLAlchemy中按upvotes函数排序

from sqlalchemy import Column, Integer
from sqlalchemy.ext.declarative import declarative_base

Base = declarative_base()

class Post(Base):
    __tablename__ = 'posts'
    
    id = Column(Integer, primary_key=True)
    upvotes = Column(Integer)
    # 其他字段...

from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker

engine = create_engine('sqlite:///database.db')
Session = sessionmaker(bind=engine)
session = Session()

# 按降序排列
results = session.query(Post).order_by(Post.upvotes.desc()).all()

# 按升序排列
results = session.query(Post).order_by(Post.upvotes.asc()).all()