Mongoose & Express:从子文档发布数据

Question

我是Express/Mongoose和后端开发的新手。我正尝试在我的模式中使用Mongoos子文档，并将表单中的数据发布到MLab数据库。

当我只使用父模式时，我成功地POSTing到了数据库，但是当我尝试从子文档中发送数据时，我得到了一个未定义的错误。如何从子文档中正确发布数据？

这是我的架构：

const mongoose = require('mongoose');
const Schema = mongoose.Schema;

const bookSchema = new Schema({
  bookTitle: {
    type: String,
    required: true
  },
  author: {
    type: String,
    required: true
  },
  genre: {
    type: String
  }
});

const userSchema = new Schema({
  name: String,
  username: String,
  githubID: String,
  profileUrl: String,
  avatar: String,
  // I've tried this with bookSchema inside array brackets and also 
  //without brackets, neither works
  books: [bookSchema]
});

const User = mongoose.model('user', userSchema);

module.exports = User;

下面是我尝试发送到数据库的路径：

router.post('/', urlencodedParser, (req, res) => {
  console.log(req.body);

  const newUser = new User({
    name: req.body.name,
    username: req.body.username,
    githubID: req.body.githubID,
    profileUrl: req.body.profileUrl,
    avatar: req.body.avatar,
    books: {
      // All of these nested objects in the subdocument are undefined. 
      //How do I properly access the subdocument objects?
      bookTitle: req.body.books.bookTitle,
      author: req.body.books.author,
      genre: req.body.books.genre
    }
  });

  newUser.save()
    .then(data => {
      res.json(data)
    })
    .catch(err => {
      res.send("Error posting to DB")
    });

});

Answer 1

我想通了。我没有使用点符号正确地访问这些值。

books: {
      // All of these nested objects in the subdocument are undefined. 
      //How do I properly access the subdocument objects?
      bookTitle: req.body.books.bookTitle,
      author: req.body.books.author,
      genre: req.body.books.genre
    }

不需要访问books对象内部的.books。req.body.books.bookTitle应该是req.body.bookTitle，依此类推。留下这篇文章，以防它对其他人有帮助。