烧瓶SQLAlchemy多对多关系的新属性

Question

我在我的数据库中使用Flask和SQLAlchemy以及多对多关系。它工作正常，但我想添加新的属性（字符串tarif）在我的表user_routes。如何在查询中编辑此属性？有可能的？谢谢

这是我的数据库查询，插入

route = get_route(request.form['fromStation'],request.form['toStation'],date_object) 
user = get_user(request.form['userToken']) 
route.users.append(user) 
user.routes.append(route) 
db.session.commit() 

模型

from app import db 

user_routes = db.Table('user_routes', 
    db.Column('route_id', db.Integer, db.ForeignKey('route.route_id'), primary_key=True), 
    db.Column('user_id', db.Integer, db.ForeignKey('user.user_id'), primary_key=True) 
) 

class User(db.Model): 
    user_id = db.Column(db.Integer, primary_key=True) 
    token = db.Column(db.String(255), unique=True) 
    routes = db.relationship("Route", secondary=user_routes) 

    def __repr__(self): 
     return '<User %r>' % (self.token) 

class Route(db.Model): 
    route_id = db.Column(db.Integer, primary_key=True) 
    route_from = db.Column(db.String(100)) 
    route_to = db.Column(db.String(100)) 
    date_time = db.Column(db.DateTime) 
    free_seats = db.Column(db.Integer) 
    users = db.relationship("User", secondary=user_routes) 

    def __repr__(self): 
     return '<Route %r>' % (self.route_id) 

Answer 1

小时后。我找到解决方案Association Object。

from app import db 

class User_has_route(db.Model): 
    __tablename__ = 'user_has_route' 
    route_id = db.Column(db.Integer, db.ForeignKey('route.route_id'), primary_key=True) 
    user_id = db.Column(db.Integer, db.ForeignKey('user.user_id'), primary_key=True) 
    tarif = db.Column(db.String(30)) 
    route = db.relationship("Route", back_populates="users") 
    user = db.relationship("User", back_populates="routes") 

class User(db.Model): 
    __tablename__ = 'user' 
    user_id = db.Column(db.Integer, primary_key=True) 
    token = db.Column(db.String(255), unique=True) 
    routes = db.relationship("User_has_route", back_populates="user") 

    def __repr__(self): 
     return '<Userik %r>' % (self.token) 

class Route(db.Model): 
    __tablename__ = 'route' 
    route_id = db.Column(db.Integer, primary_key=True) 
    route_from = db.Column(db.String(100)) 
    route_to = db.Column(db.String(100)) 
    date_time = db.Column(db.DateTime) 
    free_seats = db.Column(db.Integer) 
    users = db.relationship("User_has_route", back_populates="route") 

    def __repr__(self): 
     return '<Route %r>' % (self.date_time)