小编tab*_*ena的帖子

class Domin():
    def __init__(self , a, b) :
        self.a=a , self.b=b

    def where(self):
        print 'face : ' , self.a , "face : " ,self.b

    def value(self):
        print self.a + self.b

d1=Domin(1 , 5)   

d1=Domin(20 , 15)

我收到此错误:

Traceback (most recent call last):
  File "test2.py", line 13, in <module>
    d1=Domin(1 , 5)
  File "test2.py", line 5, in __init__
    self.a=a , self.b=b
TypeError: 'int' object is not iterable

我正在尝试利用模型实例方法的优势，如文档中所述。所以我将User类定义如下：

class User extends Model {
    addRole(role){
        let roles = this. roles;
        roles[role] = true;
        this.roles = roles;
        this.save();
    }

    removeRole (role) {
        let roles = this.roles;
        delete roles[role];
        this.save();
    }
    
    hasRole (role){
        return this.roles[role] != null;
    }
}


User.init({
// some attributes
,
roles:{
  type: DataTypes.JSON,
  allowNull: false,
}
}, { sequelize});

我希望在任何情况下都使用方法addRole(), 。removeRole()hasRole()User

所有方法都无法将更改保存到数据库的问题。（只能读取！）

// example 
let user = null; 
// get the first user to test.
User.findAll() 
    .then(users …