如何设置SQLAlchemy中两个表之间的关系？

Question

我有两个表：

1. 公告
2. AnnouncementsSchedule

关系是关键one(Announcements)到many(AnnouncementsSchedule)：

Announcements.id = AnnouncementsSchedule.announcements_id 

我试图描述SQLAlchemy的机型：

第一个表被描述为模型：

class Announcements(db.Model): 
    __tablename__ = 'announcements' 
    id = db.Column(db.Integer, primary_key=True) 
    name = db.Column(db.String(150), nullable=False) 
    text = db.Column(db.Text(), nullable=False) 
    category = db.Column(db.Integer(), nullable=False) 
    subcategory = db.Column(db.Integer(), nullable=False) 
    offer_type = db.Column(db.Integer(), nullable=False) 
    url = db.Column(db.String(150), nullable=True) 
    status = db.Column(db.Integer(), nullable=False) 
    #children = relationship("AnnouncementsSchedule", back_populates="announcements") 

二是：

class AnnouncementsSchedule(db.Model): 
    __tablename__ = 'announcements_schedule' 
    id = Column(Integer, primary_key=True) 
    week_day = db.Column(db.Integer(), nullable=True) 
    week_all = db.Column(db.Integer(), nullable=False) 
    time = db.Column(db.Time(), nullable=False) 
    announcement_id = Column(Integer, ForeignKey('announcements.announcements_id')) 

我做什么了？

Answer 1

你有列名错误（公告没有announcement_id）：

# announcement_id = Column(Integer, ForeignKey('announcements.announcements_id')) 
# change to -> 
announcement_id = Column(Integer, ForeignKey('announcements.id'))