Node.js 带有Sequelize多对多的额外列

我想知道如何从链接器表中获取额外的列

目前我有3个表：

Courses : id, title, description,
Sections: id, title, description,
CoursesSections : id, fk_course_id, fk_section_id, position

我试图用这个来获取课程，但我不明白如何从我的链接器表中获取“位置”：

db.Course.findOne({
    where: {
        id: 1,
    },
    include: [
        {
            model: db.Section,
            as: "Section",
            through: {
                attributes: ["position"],
            },
        },
    ],
    order: [[Sequelize.literal("position"), "ASC"]],
}).then((response) => {
    console.log(response.dataValues.position) // <= undefined
    console.log(response.dataValues.Section.position) // <= <= undefined
    return response.dataValues.Section // <= get without "position" field
})

截面模型：

CourseSection.associate = (models) => {
    models.CourseSection.belongsToMany(models.Course, {
        through: "CoursesSections",
        foreignKey: "fk_course_id",
    })
    models.CourseSection.belongsToMany(models.Section, {
        through: "CoursesSections",
        foreignKey: "fk_section_id",
    })
}

---

创建CourseSection模型：

CourseSection.associate = (models) => {
    models.CourseSection.belongsToMany(models.Course, {
        through: "CoursesSections",
        foreignKey: "fk_course_id",
    })
    models.CourseSection.belongsToMany(models.Section, {
        through: "CoursesSections",
        foreignKey: "fk_section_id",
    })
}

将CourseSection与课程和部分关联如下：

Course.associate = (models) => {
    models.Course.belongsToMany(models.Section, {
        as: "Section",
        through: models.CourseSection,
        foreignKey: "fk_course_id",
        otherKey: "fk_section_id",
    })
}

Section.associate = (models) => {
    models.Section.belongsToMany(models.Course, {
        as: "Course",
        through: models.CourseSection,
        foreignKey: "fk_section_id",
        otherKey: "fk_course_id",
    })
}

使用以下命令获取位置字段：

const course = await db.Course.findOne({
    where: {
        id: parent.dataValues.id,
    },
    include: [
        {
            model: db.Section,
            as: "Section",
            through: {
                attributes: ["position"],
            },
        },
    ],
    order: [[Sequelize.literal("position"), "ASC"]],
})

course.Section.forEach((section) => {
    console.log(section.dataValues.coursessections.position)

    section.position = section.dataValues.coursessections.position
})

return course.dataValues.Section

---

谢谢你，阿纳托利！我用一些修改更新了你的帖子！

const course = await db.Course.findOne({
    where: {
        id: parent.dataValues.id,
    },
    include: [
        {
            model: db.Section,
            as: "Section",
            through: {
                attributes: ["position"],
            },
        },
    ],
    order: [[Sequelize.literal("position"), "ASC"]],
})

course.Section.forEach((section) => {
    console.log(section.dataValues.coursessections.position)

    section.position = section.dataValues.coursessections.position
})

return course.dataValues.Section