Node.js 更新文档数组中的文档 Mongoose

您可以在findOneAndUpdate方法中使用$set运算符.

假设您有一份包含两本书的学生文档:

{
    "_id": "6314eda827c01a07746bceff",
    "name": "student 1",
    "books": [
        {
            "_id": "6314eda827c01a07746bcf00",
            "title": "book 1 title",
            "length": 1,
            "author": "book 1 author",
            "ISBN": "book 1 ISBN",
            "finished": true,
            "dueDate": "book 1 dueDate",
            "imgURL": "book 1 imgURL"
        },
        {
            "_id": "6314eda827c01a07746bcf01",
            "title": "book 2 title",
            "length": 2,
            "author": "book 2 author",
            "ISBN": "book 2 ISBN",
            "finished": false,
            "dueDate": "book 2 dueDate",
            "imgURL": "book 2 imgURL"
        }
    ],
    "__v": 0
}

如果我们想用this_id和其中一个书名更新学生，我们可以这样做:

app.put('/students/:studentId', async (request, response) => {
    const { studentId } = request.params;
    const { title, finished } = request.body;

    const result = await Student.findOneAndUpdate(
        {
            _id: new mongoose.Types.ObjectId(studentId),
            'books.title': title,
        },
        {
            $set: {
                'books.$.finished': finished,
            },
        },
        {
            new: true,
        }
    );

    response.send(result);
});

在这里，我在参数中获得了学生ID，在请求正文中获得了UPDATE字段，您可以根据需要进行更改.

现在，如果我们发送包含此请求正文的请求

{
    "title": "book 2 title",
    "finished": true
}

结果如下所示:(书名为‘book 2 title’的图书的Finish属性更新为True.

{
    "_id": "6314eda827c01a07746bceff",
    "name": "student 1",
    "books": [
        {
            "_id": "6314eda827c01a07746bcf00",
            "title": "book 1 title",
            "length": 1,
            "author": "book 1 author",
            "ISBN": "book 1 ISBN",
            "finished": true,
            "dueDate": "book 1 dueDate",
            "imgURL": "book 1 imgURL"
        },
        {
            "_id": "6314eda827c01a07746bcf01",
            "title": "book 2 title",
            "length": 2,
            "author": "book 2 author",
            "ISBN": "book 2 ISBN",
            "finished": true,
            "dueDate": "book 2 dueDate",
            "imgURL": "book 2 imgURL"
        }
    ],
    "__v": 0
}

您可以在请求Body中发送更多字段，并在Set中使用.