[英]sqlalchemy.exc.NoReferencedTableError: Foreign key associated with column X could not find table Y with which to generate a foreign key
[英]sqlalchemy.exc.NoReferencedTableError: Foreign key could not find table
我有一些我想迁移的模型,其中 2 个是:
家庭成员.py
class FamilyMember(db.Model):
__tablename__ = 'family_members'
id = db.Column(db.Integer, primary_key=True)
parent_id = db.Column(db.Integer, db.ForeignKey('users.id'))
name = db.Column(db.String(120), index=True)
email = db.Column(db.String(120), index=True, unique=True)
password = db.Column(db.String(128), nullable=False)
notification = db.Column(db.Boolean, default=True)
auto_ml = db.Column(db.Boolean, default=True)
photo = db.Column(db.String(128), nullable=True)
created_at = db.Column(db.DateTime(timezone=True), server_default=db.func.now())
updated_at = db.Column(db.DateTime(timezone=True), server_default=db.func.now(), onupdate=db.func.now())
notifications = db.relationship('Notification', backref='family_members', lazy='dynamic')
和 Notification.py
class Notification(db.Model):
__tablename__ = 'notifications'
id = db.Column(db.Integer, primary_key=True)
user_id = db.Column(db.Integer, db.ForeignKey('users.id'))
fm_id = db.Column(db.Integer, db.ForeignKey('family_members.id'))
text = db.Column(db.String(255))
read = db.Column(db.Boolean, default=False)
type = db.Column(db.Integer)
created_at = db.Column(db.DateTime(timezone=True), server_default=db.func.now())
updated_at = db.Column(db.DateTime(timezone=True), server_default=db.func.now(), onupdate=db.func.now())
关于这篇文章,我必须使用__tablename__ = 'tablename'
明确 state 表名,我已经这样做了,但它没有按预期的方式工作,仍然出现错误sqlalchemy.exc.NoReferencedTableError: Foreign key associated with column 'notifications.fm_id' could not find table 'family_members' with which to generate a foreign key to target column 'id'
。 我应该怎么办?
您可以在 db.relationship() 中使用back_populates而不是backref
class Notification(db.Model):
__tablename__ = 'notifications'
id = db.Column(db.Integer, primary_key=True)
user_id = db.Column(db.Integer, db.ForeignKey('users.id'))
fm_id = db.Column(db.Integer, db.ForeignKey('family_members.id'))
text = db.Column(db.String(255))
read = db.Column(db.Boolean, default=False)
type = db.Column(db.Integer)
created_at = db.Column(db.DateTime(timezone=True), server_default=db.func.now())
updated_at = db.Column(db.DateTime(timezone=True), server_default=db.func.now(), onupdate=db.func.now())
family_members = db.relationship("FamilyMember", back_populates="notifications")
class FamilyMember(db.Model):
__tablename__ = 'family_members'
id = db.Column(db.Integer, primary_key=True)
parent_id = db.Column(db.Integer, db.ForeignKey('users.id'))
name = db.Column(db.String(120), index=True)
email = db.Column(db.String(120), index=True, unique=True)
password = db.Column(db.String(128), nullable=False)
notification = db.Column(db.Boolean, default=True)
auto_ml = db.Column(db.Boolean, default=True)
photo = db.Column(db.String(128), nullable=True)
created_at = db.Column(db.DateTime(timezone=True), server_default=db.func.now())
updated_at = db.Column(db.DateTime(timezone=True), server_default=db.func.now(), onupdate=db.func.now())
notifications = db.relationship("Notification", back_populates="family_member")
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