Question

我正在尝试从书本中保存信息，该书中包含我在不同文件中引用的eschema auhtor和类型。

问题在于，当我在主计划中进行引用时。该书具有作者的推荐物以及所创建书籍的体裁，只为我保留了该书的信息，却没有提及性别或作者

book.js

   const mongoose = require('mongoose');

const bookSchema = new mongoose.Schema({
  name: {
    type: String,
  },
  author: {
    type: mongoose.Schema.ObjectId,
    ref: 'Author', 
  },
  numberInStock: {
    type: Number,
    default: 0,
  },
  image: {
    type: String,
    default: '/path/to/default/image.png',
  },
  genre: {
    type: mongoose.Schema.ObjectId,
    ref: 'Genre',  
  },
});


module.exports = mongoose.model('Books', bookSchema);

author.js

const mongoose = require('mongoose');


const authorSchema = new mongoose.Schema({
  name: String,
  publicatons: [{
    type: mongoose.Schema.Types.ObjectId,
    ref: 'Book',
  }],
});


module.exports = mongoose.model('Author', authorSchema);

createBook.ejs

<div class="container h-100">
    <div class="row">
        <div class="col-lg-6 col-md-offset-3">
            <h1>Add a New Book</h1>
            <form action="/books/new/create" method="post">
                <div class="panel panel-default">
                    <div class="panel-body">
                        <div class="form-group">
                            <label for="book_name"> Book Name: </label>
                            <input type="text"  class="form-control" name="name">
                        </div>
                         <div class="form-group">
                            <label for="exampleFormControlSelect1">Author</label>
                            <select class="form-control"  name="<%= author._id %>">
                            <% author.forEach(function(authors){ %>
                            <option><%= authors._id %></option>
                            <% }); %>
                            </select>
                        </div>
                        <div class="form-group">
                            <label for="exampleFormControlSelect1">Genre</label>
                            <select class="form-control"  name="<%= genre._id %>">
                            <% genre.forEach(function(genres){ %>
                            <option><%= genres.name %></option>
                            <% }); %>
                            </select>
                        </div>
                        <div class="form-group">
                            <label for="numberInStock">Number in stock: </label>
                            <input type="number"  class="form-control" name="numberInStock">
                        </div>
                        <div class="form-group">
                            <label for="image">Image: </label>
                            <input type="text"  class="form-control" name="image">
                        </div>
                        <button type="submit" class="btn btn-success">Success</button>
                    </div>
                </div>
            </form>
        </div>
    </div>
</div>

这是前端的一部分，我尝试将数据发送到后端，但只能保存名称，图像，数量，但不能保存引用的数据。

controller.js

   const create = (req, res, next) => {
  if (!req.body) {
    return res.status(400).json({
      error: 'No data',
    });
  }
  const book = new Books(req.body);
  book.save((err, result) => {
    if (err) {
      return res.status(400).json({
        error: err.message,
      });
    }


    return res.status(201).json({
      message: 'Book created succesfully',
      result,

    });
  });
};

路由控制器

const express = require('express');

const router = express.Router();
const bookController = require('../controllers/book');
const booksave = require('../controllers/create');
const authorController = require('../controllers/author');
const genreController = require('../controllers/genre');

router.get('/books/home/:page', bookController.list);

router.get('/books/new', bookController.createTemplate);
router.post('/books/new/create', booksave.create);

router.get('/books/details/:id', bookController.bookDetail);

router.get('/books/new/create/genre', genreController.createGenreTemplate);
router.post('/books/new/genre', genreController.createGenre);

router.get('/books/new/create/author', authorController.createAuthorTemplate );
router.post('/books/new/author', authorController.createAuthor);




module.exports = router;

创建新书渲染

controller.createTemplate = (req, res) => {
  Author.find({}, (err, allAuthors) => {
    if (err) {
      console.log(err);
    } else {
      Genre.find({}, (err, allGenres) => {
        if (err) {
          console.log(err)
        } else {
          res.render('new', { author: allAuthors, genre: allGenres });
        }
      })

    }
  });
};

从技术上讲，我希望获得的信息是，当我保存这本书的信息时，它会引用其作者和类型，并且作者会自动引用相同的参考书

Answer 1

将<select class="form-control" name="<%= genre._id %>">中的name属性更改为name='author'中的bookSchema，将<select class="form-control" name="<%= genre._id %>">中的name属性更改为name='genre'。
问题是您发送带有以下正文的发帖请求：

{ name: /*value*/ , <%= author._id%>: /*value*/, <%= genre._id%>: /*value*/, numberInStock: /*value*/, image: /*image*/ }

您的Book模型的构造函数可以识别name, numberInStock and image，但不能识别<%=author_id%> and <%=genre._id%>。
还要更改此内容：

author: {
    type: mongoose.Schema.ObjectId,
    ref: 'Author'
  },
genre: {
    type: mongoose.Schema.ObjectId,
    ref: 'Genre'
}

到

author: {
    type: mongoose.Schema.Types.ObjectId,
    ref: ref: 'Author'
}
genre: {
    type: mongoose.Schema.Types.ObjectId,
    ref: 'Genre'
}

您还需要传递genre._id而不是genres.name，并且将author._id作为value属性，如下所示：



<form action="/books/new/create" method="post">
    <select name="author">
    <% author.forEach(function(authors){ %>
      <option value="<%= authors._id %>" ><%= authors.name %></option>
    <% }); %>
    </select>
    <select name="genre">
    <% genre.forEach(function(genres){ %>
      <option value="<%= genres._id %>" ><%= genres.name %></option>
    <% }); %>
    </select>
    <button type="submit">Success</button>
</form>

Answer 2

我只是得到前线的值

{name: 'Digital Fortress', numberInStock: '', image: ''}


const create = (req, res, next) => {
  if (!req.body) {
    return res.status(400).json({
      error: 'No data received',
    });
  }
  const book = new Books(req.body); 
  book.save((err, result) => {
    if (err) {
      return res.status(400).json({
        error: err.message,
      });
    }

    console.log(req.body);
    return res.status(201).json({
      message: 'Book created succesfully',
      result,

    });
  });
};

尝试引用架构时如何保存数据

2 个答案: