Wie behebe ich das Problem, um Daten in mongodb in node.js zu speichern?

Question

Ich habe einen Code erstellt, um einen Server mit node.js, express.js und mongodb zu erstellen. Es ist ein einfacher Code, um Benutzerdaten zu mongodb zu speichern. Ich habe diesen Code mit Advanced REST Client getestet.

In diesem Moment werden die Anforderungsparameter übertragen, haben jedoch einen Fehler von 0, wenn die Anforderung mit dieser URL gesendet wird: http://localhost:8080/users.

server.js

var express  = require('express'); 
var app   = express(); 
var port  = process.env.PORT || 8080; 
var morgan  = require('morgan'); 
var mongoose = require('mongoose'); 
var User  = require('./user'); 
var bodyParser = require('body-parser'); 

app.use(bodyParser.json()); // for parsing application/json 
app.use(bodyParser.urlencoded({ extended: true })); // for parsing application/x-www-form-urlencoded 
app.use(morgan('dev')); 

mongoose.createConnection('mongodb://localhost:27017/mean', function(err) { 
    if (err) { 
     console.log('Not connected to the database: ' + err); 
    } else { 
     console.log('Successfully connected to MongoDB') 
    } 
}); 

// http://localhost:8080/users 
app.post('/users', function(req, res) { 
    var user = new User(); 
    user.username = req.body.username; 
    user.password = req.body.password; 
    user.email = req.body.email; 
    if (req.body.username == null || req.body.username == "" || req.body.password == null || req.body.password == "" || req.body.email == null || req.body.email == "") { 
     res.send("Ensure username, email and password were provided"); 
    } else { 
     user.save(function(err) { 
      if (err) { 
       res.send("Username or Email already exists."); 
      } else { 
       res.send("user created"); 
      } 
     }); 
    } 
}); 

app.listen(port, function() { 
    console.log('Running the server on port ' + port); 
}); 

user.js

var mongoose = require('mongoose'); 
var Schema = mongoose.Schema; 
var bcrypt = require('bcrypt-nodejs'); 

var UserSchema = new Schema({ 
    username: { type: String, lowercase: true, required: true, unique: true }, 
    password: { type: String, required: true }, 
    email: { type: String, required: true, lowercase: true, unique: true } 
}); 

UserSchema.pre('save', function(next) { 

    var user = this; 
    bcrypt.hash(user.password, null, null, function(err, hash) { 
     if (err) return next(err); 
     user.password = hash; 
     next(); 
    }); 
}); 

module.exports = mongoose.model('User', UserSchema); 

package.json

{ 
    "name": "mean", 
    "version": "1.0.0", 
    "description": "", 
    "main": "server.js", 
    "scripts": { 
    "test": "echo \"Error: no test specified\" && exit 1" 
    }, 
    "author": "", 
    "license": "ISC", 
    "dependencies": { 
    "bcrypt-nodejs": "0.0.3", 
    "body-parser": "^2.18.2", 
    "express": "^4.16.2", 
    "mongoose": "^4.13.7", 
    "morgan": "^1.9.0" 
    } 
} 

Answer 1

Sie sollten anstelle einer get Anfrage mit Ihrem Browser eine post Anfrage tun.

Auch

var user = new User(); 
    user.username = req.body.username; 
    user.password = req.body.password; 
    user.email = req.body.email; 
    if (req.body.username == null || req.body.username == "" || req.body.password == null || req.body.password == "" || req.body.email == null || req.body.email == "") { 
     res.send("Ensure username, email and password were provided"); 

Sie senden keine Parameter wie email oder name, ... in Ihrer Anfrage. So kann nichts in Ihrer Datenbank gespeichert werden.

Do post Anfrage statt get und erwägen, die richtigen Parameter in Ihre Anfrage hinzuzufügen und alles wird gut.

Answer 2

In server.js diesen Code verwenden, um MongoDB zu verbinden

mongoose.connect('mongodb://localhost:27017/mean', function(err) { 
    if (err) { 
     console.log('Not connected to the database: ' + err); 
    } else { 
     console.log('Successfully connected to MongoDB') 
    } 
}); 

Mongo DB speichert Objekt: