保存并填充节点js

Question

我的课程架构如下所示

const studentSchema = new mongoose.Schema({
    name: {
        type: String,
        required: true
    },
    current_education: {
        type: String,
        required: true
    },
    course_name: {
        type: mongoose.Schema.Types.ObjectId,
        ref:'Course'
    },
    address: {
        type: String,
        required: true
    },
    mobile_number: {
        type: Number,
        required: true
    },
    date: {
        type: Date,
        default: Date.now
    }
})

并且我正在尝试使关系学生成为该课程的学生。在控制器中，我正在尝试根据如下课程ID填充课程详细信息

exports.createStudent = async (req, res) => {
    try {
        const student = new Student(req.body);
        const result = await student.save().then(t => Course.findById(req.body.course_name).populate('courses'));
        if (!result) res.send('something went wrong');
        res.send(result)
    } catch (e) {
        res.send(e);
    }
}

在邮递员中我的发布方式，您可以在下面查看

{
    "name":"Ram",
    "current_education":"B.tech",
    "course_name":"5cb804f1e97ba91cb8ca9dac",
    "address":"Bangalore",
    "mobile_number":7894561236
}

重要：此处的课程ID在数据库中 数据已成功保存在数据库中，但除ID外，未填充课程详细信息。数据库中的结果数据如下所示

Answer 1

我想您想要学生详细信息以及课程详细信息：

这是您实现的方式：

exports.createStudent = async (req, res) => {
    try {
        const student = new Student(req.body);
        const result = await student.save().then(t =>
            Student.findById(student._id).populate('course_name')); // Pass new ID and then populate the "course_name"
        if (!result) res.send('something went wrong');
        res.send(result)
    } catch (e) {
        res.send(e);
    }
}

希望这可以解决您的查询！