'role' is an invalid keyword argument for User

#  数据库的代码里少了一行 

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')********

    def __repr__(self):
        return '<Role %r>' % self.name

然后user们没进去  就报错了