如何从flask-SQLAlchemy查询SQL视图

from flask import Flask
from flask_sqlalchemy import SQLAlchemy

app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///example.db'
db = SQLAlchemy(app)

class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String(80), unique=True, nullable=False)

class Order(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    user_id = db.Column(db.Integer, db.ForeignKey('user.id'), nullable=False)
    product = db.Column(db.String(120), nullable=False)

CREATE VIEW user_view AS
SELECT u.id, u.username, o.product
FROM users u
JOIN orders o ON u.id = o.user_id;

class UserView(db.Model):
    __table__ = db.metadata.tables['user_view']

@app.route('/users')
def get_users():
    users = UserView.query.all()
    return {'users': [user.__dict__ for user in users]}