flask-sqlalchemy，一对多关系，外键更改为NULL

我有用户表和专辑表等等。而用户相册有一对多的关系。flask-sqlalchemy，一对多关系，外键更改为NULL

但是，当用户与一个或多个专辑相关联时，不包括来自专辑表中的最新专辑的外键将更改为空。 This is the case that user_uid=1 have 3 albums and user_uid=2 have 1 album.(BUT foreign key having user_uid=1 is only just one.而且这个问题在任何地方都有一对多的关系。这里是我的代码..

class User(Base): 
__tablename__ = 'user' 

uid = Column(Integer, primary_key=True) 
username = Column(String(10), unique=True, nullable=False) 
email = Column(String(35), unique=True, nullable=False) 
salted_password = Column(String(100), unique=True, nullable=False) 
profile_pic = Column(String(100)) 
authorization = Column(Boolean) 
expiry = Column(DATETIME) 
fcm_token = Column(String(45)) 
created_at = Column(DATETIME) 
albums = relationship('Album') 
notifications = relationship('Notification') 
like_photo = relationship('Photo', secondary=like_photo) 
follow_album = relationship('Album', secondary=follow_album) 
followed = relationship('User', 
          secondary=followers, 
          primaryjoin=(followers.c.follower_id == uid), 
          secondaryjoin=(followers.c.followed_id == uid), 
          backref=backref('followers', lazy='dynamic'), 
          lazy='dynamic') 
comment_photo = relationship('Photo', secondary=comment) 




class Album(Base): 
__tablename__ = 'album' 

aid = Column(Integer, primary_key=True) 
title = Column(String(45), nullable=False) 
created_at = Column(DATETIME) 
user_uid = Column(Integer, ForeignKey('user.uid')) 
photos = relationship('Photo') 
album_tags = relationship('Album_tag')

我更新专辑表像下面..

u = User.query.filter(User.uid == session['uid']).first() 
u.albums = [Album(title=request.json['title'], created_at=datetime.utcnow())]    
db_session.add(u) 
db_session.commit()

我不知道为什么..

来源

2017-04-04 조민주

你可以张贴代码与你如何发布数据到你的表吗？用户和专辑表？ –

（首先我找到用户'你'谁在会话中）u.albums = [专辑（标题= request.json ['标题']，created_at = datetime.utcnow（））]; db_session.add（U）; db_session.commit（）; –

我认为你这样做是为了覆盖专辑列表，最好是用相反的方式来创建专辑，然后分配它的Album.user_uid = u.uid –

我相信你需要做其他因为在你的方式，你是压倒性的用户的相册列表：

coffee_album = Album(title=request.json['title'], \ 
        created_at=datetime.utcnow()) 
u = User.query.filter(User.uid == session['uid']).first() 
coffe_album.user_uid = u.uid 
db_session.add(coffee_album) 
db_session.commit()

来源

2017-04-04 16:21:02

伟大的解决方案。谢谢。 – joshlsullivan

flask-sqlalchemy，一对多关系，外键更改为NULL

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