使用angular2 +服务编辑对象，mongoDB和NodeJs

我想对存储在数据库（mongoDB）中的数据进行基本编辑。 这是我所做的：

angular度服务

createReview(review) { let headers = new Headers(); headers.append('Content-Type', 'application/json'); this.http.post('http://localhost:3000/api/reviews', JSON.stringify(review), { headers: headers }) .subscribe(res => { console.log(res.json()); }); } editReview(review) { let headers = new Headers(); headers.append('Content-Type', 'application/json'); this.http.post('http://localhost:3000/api/reviews', JSON.stringify(review), { headers: headers }) .subscribe(res => { console.log(res.json()); }); } 

deleteReview（id）{

 this.http.delete('http://localhost:3000/api/reviews/' + id).subscribe((res) => { console.log(res.json()); }); 

}

在server.js中

 // Set up var express = require('express'); var app = express(); // create our app w/ express var mongoose = require('mongoose'); // mongoose for mongodb var ObjectId = require('mongodb').ObjectID; // objectID var morgan = require('morgan'); // log requests to the console (express4) var bodyParser = require('body-parser'); // pull information from HTML POST (express4) var methodOverride = require('method-override'); // simulate DELETE and PUT (express4) var cors = require('cors'); // Configuration mongoose.connect('mongodb://localhost/data'); app.use(morgan('dev')); // log every request to the console app.use(bodyParser.urlencoded({ 'extended': 'true' })); // parse application/x-www-form-urlencoded app.use(bodyParser.json()); // parse application/json app.use(bodyParser.json({ type: 'application/vnd.api+json' })); // parse application/vnd.api+json as json app.use(methodOverride()); app.use(cors()); app.use(function(req, res, next) { res.header("Access-Control-Allow-Origin", "*"); res.header('Access-Control-Allow-Methods', 'DELETE, PUT'); res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept"); next(); }); // Models var Review = mongoose.model('Review', { title: String, description: String, rating: Number }); // Routes // Get reviews app.get('/api/reviews', function(req, res) { console.log("fetching reviews"); // use mongoose to get all reviews in the database Review.find(function(err, reviews) { // if there is an error retrieving, send the error. nothing after res.send(err) will execute if (err) res.send(err) res.json(reviews); // return all reviews in JSON format }); }); // create review and send back all reviews after creation app.post('/api/reviews', function(req, res) { if (req.params.review_id == undefined) { console.log("creating review"); // create a review, information comes from request from Ionic Review.create({ title: req.body.title, description: req.body.description, rating: req.body.rating, done: false }, function(err, review) { if (err) res.send(err); // get and return all the reviews after you create another Review.find(function(err, reviews) { if (err) res.send(err) res.json(reviews); }); }); } else { console.log("editing review") var query = ObjectId(req.params.review_id); // update a review, information comes from request from Ionic Review.findOneAndUpdate(query, { title: req.body.title, description: req.body.description, rating: req.body.rating, done: false }, function(err, review) { if (err) res.send(err); // get and return all the reviews after you create another Review.find(function(err, reviews) { if (err) res.send(err) res.json(reviews); }); }); } }); // delete a review app.delete('/api/reviews/:review_id', function(req, res) { console.log("deleting review"); Review.remove({ _id: req.params.review_id }, function(err, review) { }); }); // listen (start app with node server.js) ====================================== app.listen(3000); console.log("App listening on port 3000"); 

创build一个新的审查工作很好，也删除审查。 但是在编辑时，我从server.js的app.post函数中得到了req.params.review_id的未定义错误。 我确定我没有以正确的方式做这件事。 如何使用这些库和框架来更新数据？

Answer 1

正如在注释中提到的那样，您使用了一个参数，该参数在您的快速应用程序的路由中没有定义。

您可以将参数设置为可选（将用于创build和编辑），通过将您的路由定义写为：

 app.post('/api/reviews/:review_id?', function(req, res) { /* .... */ } ); 

请记住，遵循适当的REST架构，您应该在PUT请求中分离实体的编辑。

 app.post( '/api/reviews', function( req, res ) { /** Handle Create */ } ); app.put( '/api/reviews/:review_id', function( req, res ) { /** Handle Edits */ } );