参照《Flask Web 开发》书中方法更新数据库出错如何解，,学习到《Flask We

参照《Flask Web 开发》书中方法更新数据库出错如何解，,学习到《Flask We

学习到《Flask Web开发》第八章时，运行代码报错。后来意识到User表中新增了一列，应该更新数据库，执行

python manage.py db migrate -m "initial migration"

结果报错：alembic.util.exc.CommandError: Target database is not up to date.

这种错误先前没有遇到过，网上找了一下也不理解。

相关代码app/models.py:

from . import dbfrom werkzeug.security import generate_password_hash, check_password_hashfrom flask_login import UserMixinfrom . import login_managerfrom itsdangerous import TimedJSONWebSignatureSerializer as Serializerfrom flask import current_app@login_manager.user_loaderdef load_user(user_id):    return User.query.get(int(user_id))class Role(db.Model):    __tablename__ = 'roles'    id = db.Column(db.Integer, primary_key = True)    name = db.Column(db.String(64), unique = True)    users = db.relationship('User', backref = 'role', lazy = 'dynamic')        def __repr__(self):        return '<Role %r>' % self.name        class User(UserMixin, db.Model):    __tablename__ = 'users'    id = db.Column(db.Integer, primary_key = True)    email = db.Column(db.String(64), unique=True, index=True)    username = db.Column(db.String(64), unique = True, index = True)    role_id = db.Column(db.Integer, db.ForeignKey('roles.id'))    password_hash = db.Column(db.String(128))    confirmed = db.Column(db.Boolean, default=False)        @property    def password(self):        raise AttributeError('password is not a readable attribute')        @password.setter    def password(self, password):        self.password_hash = generate_password_hash(password)        def verify_password(self, password):        return check_password_hash(self.password_hash, password)        def __repr__(self):        return '<User %r>' % self.username    def generate_confirmation_token(self, expiration=3600):        s = Serializer(current_app.config['SECRET_KEY'], expiration)        return s.dump({'confirm': self.id})    def confirm(self, token):        s = Serializer(current_app.config['SECRET_KEY'])        try:            data = s.loads(token)        except:            return False        if data.get('confirm') != self.id:            return False        self.confirmed = True        db.session.add(self)        return True

求指导！！！

编橙之家文章，