updateOne $ set not working - Mongoose

Question

我试图更新数组中的子文档books但没有成功。新数据不会被保存。

快递：

router.put("/:id/:bookid", (req, res) => {
  Library.updateOne(
    { _id: req.params.id, "books._id": req.params.bookid },
    { $set: { "books.$.title": "New value" } }
  );
});

LibraryScema：

const LibarySchema = new Library({
  Name: {
    type: String,
    required: false
  }, 
  books: [BookSchema]
});

bookScema：

const BookSchema = new Schema({

  title: {
    type: String,
    required: false
  },
  Chapters: [
    {
      chapterTitle: {
        type: String,
        required: false
      }
    }
  ]
});

我做错了什么？

修改

图书馆表：

       {
        "_id": {
            "$oid": "12345"
        },
        "Name": "A random libary",
        "Books": [       
            {
                "_id": {
                    "$oid": "1"
                }
                "title": "TitleExample",
                "Chapters": [
                    {
                      chapterTitle: "first chapter etc"
                    }]             
            },
            {
                "_id": {
                    "$oid": "2"
                }
                "title": "Another book"  ,
                "Chapters": [
                    {
                      chapterTitle: "first chapter etc"
                    }]  
             }
           ]
         }

Answer 1

I updated my answer.

router.put("/:id/:bookid", (req, res) => {
      Library.findOne({ _id: req.params.id, "books._id": req.params.bookid }).exec(function(err,result){
    if(err)throw err;
    if(result){
    result.books.title="new value";
    result.save()
    console.log("new value")
    }
    else{console.log("not found")}
    })
    });

你可以试试这个，也许可以帮到你。