在sequelize中获取数据时如何删除关联字段？

Question

我要删除类数据中的class_teacher。

我尝试通过attributes字段来排除class_teacher。但这是行不通的。

我还有尝试

const classes = await Teacher.findOne({
    where: {
        id: 1
    },
    include: [{
        model: Class,
        through: {
            attributes: []
        }
    }]
})

那是可行的〜但是我想知道还有另一种方法可以实现它。

共有三个模型，分别名为Teacher and Class和ClassTeacher

sequelize.define('class', {
    id: {
        type: dataTypes.BIGINT(11),
        allowNull: false,
        primaryKey: true,
        autoIncrement: true,
        unique: true,
        comment: 'class id',
    },
    name: {
        type: dataTypes.STRING,
        allowNull: false,
        comment: 'class name'
    }
})
sequelize.define('teacher', {
    id: {
        type: dataTypes.BIGINT(11),
        allowNull: false,
        primaryKey: true,
        autoIncrement: true,
        unique: true,
        comment: 'teacher id',
    },
    name: {
        type: dataTypes.STRING,
        allowNull: false,
        comment: 'teacher name'
    }
})
sequelize.define('class_teacher', {
    id: {
        type: dataTypes.BIGINT(11),
        allowNull: false,
        primaryKey: true,
        autoIncrement: true,
        unique: true,
        comment: 'association id',
    }
})

协会

Class.belongsToMany(Teacher, {
    through: ClassTeacher
});
Teacher.belongsToMany(Class, {
    through: ClassTeacher
});

现在我要查询ID为1的老师

// get the teacher
const teacher = await Teacher.findByPk(1);
// get classes of this teacher
const classes = teacher.getClasses()
ctx.body = {classes}

让我们看一下Koa反应的数据

{
    "classes": [
        {
            "id": 1,
            "name": "grade one",
            "createdAt": "2019-05-15T09:53:35.000Z",
            "updatedAt": "2019-05-15T09:53:35.000Z",
            "deletedAt": null,
            "class_teacher": {
                "id": 1,
                "createdAt": "2019-05-15T09:53:35.000Z",
                "updatedAt": "2019-05-15T09:53:35.000Z",
                "deletedAt": null,
                "classId": 1,
                "teacherId": 1
            }
        },
        {
            "id": 2,
            "name": "grade two",
            "createdAt": "2019-05-16T10:48:14.000Z",
            "updatedAt": "2019-05-16T10:48:15.000Z",
            "deletedAt": null,
            "class_teacher": {
                "id": 4,
                "createdAt": "2019-05-16T02:48:19.000Z",
                "updatedAt": "2019-05-16T02:48:19.000Z",
                "deletedAt": null,
                "classId": 2,
                "teacherId": 1
            }
        }
    ]
}

不是我要删除的class_teacher字段。

我可以这样做吗？

预期数据

{
    "classes": [
        {
            "id": 1,
            "name": "grade one",
            "createdAt": "2019-05-15T09:53:35.000Z",
            "updatedAt": "2019-05-15T09:53:35.000Z",
            "deletedAt": null

        },
        {
            "id": 2,
            "name": "grade two",
            "createdAt": "2019-05-16T10:48:14.000Z",
            "updatedAt": "2019-05-16T10:48:15.000Z",
            "deletedAt": null

        }
    ]
}