javascript - Mongoose 和 express : POST data from subdocument

Question

我是 Express/Mongoose 和后端开发的新手。我正在尝试在我的架构中使用 Mongoose 子文档并将数据从表单发布到 MLab 数据库。

当我只使用父架构时，我成功地发布到数据库，但是当我尝试也从子文档发布数据时，我收到了一个未定义的错误。如何正确地从子文档发布数据？

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;

这是我尝试 POST 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

想通了。我没有使用点表示法正确访问这些值。

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
    }

无需访问 books 对象内的 .books。 req.body.books.bookTitle 应该是 req.body.bookTitle 等等。留下这篇文章以防它对其他人有帮助。