Question

我正在尝试构建一个Node API，它使用MongoDB从包含以下JSON格式的Book信息的文件中创建和获取信息：

{
 Name: String,
 Author: String,
 Price: Number
}

我无法向数据库添加信息。我得到了Book打印成功的消息。但是当我看到数据库时，只使用ID和版本密钥_v创建了一个JSON文档。

以下是我的API代码：

var express = require('express');
var app = express();
var bodyParser=require('body-parser');
var mongoose=require('mongoose');
var book = require('./automobile/reading/book')

//configuring the app for the bosy data intake for post operations
app.use(bodyParser.urlencoded({extended:true}));
app.use(bodyParser.json());

var PORT= process.env.PORT || 3000;

mongoose.connect('mongodb://localhost:27017/helloworldapi');

var router = express.Router();

app.use('/api', router);

router.use(function(req,res,next){
  console.log('There is something happening in the API');
  next();
})

router.route('/books')
  .post(function(req,res){
    var bookDB = new book();
    bookDB.name=req.body.name;
    bookDB.author=req.body.author;
    bookDB.price=req.body.price;

    bookDB.save(function(err){
      if(err){
        res.send(err);
      }
    res.json({message: 'Book was successfully printed'});
    });
  })
  .get(function(req,res){
    book.find(function(err, books){
     if(err){
       res.send(err);
     }
      res.json(books);
    });
  });
  router.route('/books/:book_id')
    .get(function(req,res){
      book.findById(req.params.book_id, function(err, books){
        if(err){
          res.send(err);
        }
          res.json(books)
      });
    });

  router.route('/books/name/:name')
  .get(function(req,res){
    book.find({name:req.params.name}, function(err, books){
      if(err){
        res.send(err);
      }
        res.json(books);
    });
  });

  router.route('/books/author/:author')
   .get(function(req,res){
     book.find({author:req.params.author}, function(err, books){
       if(err){
         res.send(err);
       }
         res.json(books);
     });
   });

app.listen(PORT);
console.log('server listening on port '+PORT);

在执行GET操作后尝试执行POST操作时，我收到以下回复：

[
    {
        "_id": "5a788cf1ad829e3aa4b91287",
        "__v": 0
    }
]

以下是我的谢玛：

var mongoose = require('mongoose');
var Schema = mongoose.Schema;

var BookSchema = new Schema({
  Name: String,
  Author: String,
  Price: Number 
});

module.exports= mongoose.model('book',BookSchema);

请不要介意根文件夹automobiles。计划在一开始就创造别的东西。

Answer 1

您可以使用

  router.route('/books')
  .post(function(req,res){
   var bookDB = new book(req.body);

   bookDB.save(function(err){
    if(err){
     res.send(err);
    }
   res.json({message: 'Book was successfully printed'});
  });
})

但是架构值上的req.body值应该相同。

Answer 2

我相信这是因为你没有分配到合适的属性。在您的路线中，您可以指定小写属性。但是，Schema定义了大写属性。看看是否匹配案例：

router.route('/books')
  .post(function(req,res){
    var bookDB = new book();
    bookDB.name=req.body.name; // This needs to match the property in the schema exactly
    bookDB.author=req.body.author;
    bookDB.price=req.body.price;

    bookDB.save(function(err){
      if(err){
        res.send(err);
      }
    res.json({message: 'Book was successfully printed'});
    });
  })

var BookSchema = new Schema({
  name: String, // Now I'm lower case
  author: String,
  price: Number 
});

或者您可以将路由器设为大写：

router.route('/books')
  .post(function(req,res){
    var bookDB = new book();
    bookDB.Name=req.body.name;
    bookDB.Author=req.body.author;
    bookDB.Price=req.body.price;

    bookDB.save(function(err){
      if(err){
        res.send(err);
      }
    res.json({message: 'Book was successfully printed'});
    });
  })

JSON数据未添加到DB

2 个答案: