版权声明: https://blog.csdn.net/weixin_42157608/article/details/80712590
示例场景
- 用户关注其他用户(用户表,中间表)
tb_user_follows = db.Table(
"tb_user_follows",
db.Column('follower_id', db.Integer, db.ForeignKey('info_user.id'), primary_key=True), # 粉丝id
db.Column('followed_id', db.Integer, db.ForeignKey('info_user.id'), primary_key=True) # 被关注人的id
)
class User(db.Model):
"""用户表"""
__tablename__ = "info_user"
id = db.Column(db.Integer, primary_key=True)
name = db.Column(db.String(32), unique=True, nullable=False)
# 用户所有的粉丝,添加了反向引用followed,代表用户都关注了哪些人
followers = db.relationship('User',
secondary=tb_user_follows,
primaryjoin=id == tb_user_follows.c.followed_id,
secondaryjoin=id == tb_user_follows.c.follower_id,
backref=db.backref('followed', lazy='dynamic'),
lazy='dynamic')
"tb_user_follows",
db.Column('follower_id', db.Integer, db.ForeignKey('info_user.id'), primary_key=True), # 粉丝id
db.Column('followed_id', db.Integer, db.ForeignKey('info_user.id'), primary_key=True) # 被关注人的id
)
class User(db.Model):
"""用户表"""
__tablename__ = "info_user"
id = db.Column(db.Integer, primary_key=True)
name = db.Column(db.String(32), unique=True, nullable=False)
# 用户所有的粉丝,添加了反向引用followed,代表用户都关注了哪些人
followers = db.relationship('User',
secondary=tb_user_follows,
primaryjoin=id == tb_user_follows.c.followed_id,
secondaryjoin=id == tb_user_follows.c.follower_id,
backref=db.backref('followed', lazy='dynamic'),
lazy='dynamic')