如何在SQLAlchemy中设置两个表之间的关系？

Question

我有两张桌子：

1. 公告
2. AnnouncementsSchedule

按键的关系为one(Announcements)到many(AnnouncementsSchedule)：

Announcements.id = AnnouncementsSchedule.announcements_id

我试图在SQLAlchemy中描述模型：

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")

第二是：

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'))

我做错了什么？

Answer 1

列名中有错误（公告没有 announcement_id ）：

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