使用 angular2+ 服务、mongoDB 和 NodeJs 编辑对象

Question

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：

角度服务

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());
});
}

删除评论(id( {

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

}

在服务器中.js

// 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");

创建新评论效果很好，也可以删除评论。但是在编辑时，我从服务器.js的 app.post 函数中req.params.review_id收到未定义的错误。 我确定我没有以正确的方式做到这一点。 如何使用这些库和框架更新数据？

Answer 1

如注释中所述，您使用的参数未在快速应用程序的路由中定义。

您可以将参数设置为可选(将用于创建和编辑(，方法是将路由定义编写为：

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

请记住，遵循正确的 REST 体系结构，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 */ } );