Question

这是我正在尝试的代码，用于创建迁移文件但无法升级。

ConvMaster [将其视为书名] 以其ID作为外键进入响应主控[本章内容]

IntentMaster [将其视为章节名称]

RespMaster [本章内容]

ChatHistory [类似于记录库，它记录，阅读了哪些内容，从哪一章和从哪本书开始

为了便于操作，我想将记录保留在ChatHistory中，而不是从RespMaster查询它。 错误-与外键约束有关

请提出如何实现此目标，或者仅是查询的方法？

class ConvMaster(db.Model):
    __tablename__ = 'convmaster'
    id = db.Column(db.Integer, primary_key=True)
    convName = db.Column(db.String(60), unique = True)
    timestamp = db.Column(db.DateTime, index=True, default=datetime.utcnow)
    resp = db.relationship('RespMaster', backref='conv', lazy='dynamic')
    chat = db.relationship('ChatHistory', backref='chatconv', lazy='dynamic')
    def __repr__(self):
        return '<ConvMaster: {}>'.format(self.convName)

class IntentMaster(db.Model):
    __tablename__ = 'intentmaster'
    id = db.Column(db.Integer, primary_key=True)
    intentName = db.Column(db.String(60), unique = True)
    timestamp = db.Column(db.DateTime, index=True, default=datetime.utcnow)
    resp = db.relationship('RespMaster', backref='intent', lazy='dynamic')
    chat = db.relationship('ChatHistory', backref='chatintent', lazy='dynamic')
    def __repr__(self):
        return '<Intent_Master: {}>'.format(self.intentName)

class RespMaster(db.Model):
    __tablename__ = 'respmaster'
    id = db.Column(db.Integer, primary_key=True)
    convID = db.Column(db.Integer, db.ForeignKey('convmaster.id'), nullable=False)
    intentID = db.Column(db.Integer, db.ForeignKey('intentmaster.id'), nullable=False)
    resp = db.Column(db.String(1000))
    timestamp = db.Column(db.DateTime, index=True, default=datetime.utcnow)
    chat = db.relationship('ChatHistory', backref='chatresp', lazy='dynamic')
    def __repr__(self):
        return '<Response_Master: {}>'.format(self.resp)

class ChatHistory(db.Model):
    __tablename__ = 'chathistory'
    id = db.Column(db.Integer, primary_key=True)
    userText = db.Column(db.String(1000), nullable=False)
    convID = db.Column(db.Integer, db.ForeignKey('convmaster.id'))
    intentID = db.Column(db.Integer, db.ForeignKey('intentmaster.id'), nullable=False)
    respID = db.Column(db.Integer, db.ForeignKey('respmaster.id'), nullable=False)
    feedback = db.Column(db.String(5))
    timestamp = db.Column(db.DateTime, index=True, default=datetime.utcnow)
    def __repr__(self):
        return '<Chat_History: {}>'.format(self.userText)

答案：

对我有用的东西。

在聊天和响应变量中分别在ConvMaster和IntentMaster的一侧添加参数 foreign_keys 。在这种情况下，这是必需的。
删除 nullable = false 约束。这对升级产生了重大影响，这给外键约束带来了错误。

有效的代码在这里

class ConvMaster(db.Model):
    """
    Create a page visit master
    """
    __tablename__ = 'convmaster'
    id = db.Column(db.Integer, primary_key=True)
    convName = db.Column(db.String(60), unique = True)
    timestamp = db.Column(db.DateTime, index=True, default=datetime.utcnow)
    resp = db.relationship('RespMaster', foreign_keys='RespMaster.convID', backref='conv', lazy='dynamic')
    chat = db.relationship('ChatHistory', foreign_keys='ChatHistory.convID', backref='chatconv', lazy='dynamic')
    def __repr__(self):
        return '<ConvMaster: {}>'.format(self.convName)

class IntentMaster(db.Model):
    """
    Create a page visit master
    """
    __tablename__ = 'intentmaster'
    id = db.Column(db.Integer, primary_key=True)
    intentName = db.Column(db.String(60), unique = True)
    timestamp = db.Column(db.DateTime, index=True, default=datetime.utcnow)
    resp = db.relationship('RespMaster', foreign_keys='RespMaster.intentID', backref='intent', lazy='dynamic')
    chat = db.relationship('ChatHistory', foreign_keys='ChatHistory.intentID', backref='chatintent', lazy='dynamic')
    def __repr__(self):
        return '<Intent_Master: {}>'.format(self.intentName)

class RespMaster(db.Model):
    """
    Create a page visit master
    """
    __tablename__ = 'respmaster'
    id = db.Column(db.Integer, primary_key=True)
    convID = db.Column(db.Integer, db.ForeignKey('convmaster.id'))
    intentID = db.Column(db.Integer, db.ForeignKey('intentmaster.id'))
    resp = db.Column(db.String(1000))
    timestamp = db.Column(db.DateTime, index=True, default=datetime.utcnow)
    chat = db.relationship('ChatHistory', backref='chatresp', lazy='dynamic')
    def __repr__(self):
        return '<Response_Master: {}>'.format(self.resp)

class ChatHistory(db.Model):
    """
    Create a page visit master
    """
    __tablename__ = 'chathistory'
    id = db.Column(db.Integer, primary_key=True)
    userText = db.Column(db.String(1000), nullable=False)
    convID = db.Column(db.Integer, db.ForeignKey('convmaster.id'))
    intentID = db.Column(db.Integer, db.ForeignKey('intentmaster.id'))
    respID = db.Column(db.Integer, db.ForeignKey('respmaster.id'))
    feedback = db.Column(db.String(5))
    timestamp = db.Column(db.DateTime, index=True, default=datetime.utcnow)
    def __repr__(self):
        return '<Chat_History: {}>'.format(self.userText)

具有外键约束的Flask Migrate问题，多个多对一关系

0 个答案: