【发布时间】：2017-11-10 12:04:06
【问题描述】：
我开始使用 Node.js 为我的 Web 应用程序构建我的 REST Api。到目前为止，我在邮递员中对其进行了测试，并且可以正常工作。例如，我插入此链接 http://localhost:3000/news 并通过给我一个 json 响应来工作。
[
{
"_id": "593978f7995e071df49b08d8",
"updatedAt": "2017-06-08T16:19:03.551Z",
"createdAt": "2017-06-08T16:19:03.551Z",
"title": "Camping in the City and this year.",
"image": "img/news1.jpg",
"description": "From the Municipality of Larissa, and in particular the Social Policy Advocacy and the Department of Sports and Culture and Social Policy, it is announced that following the absolutely successful 'Camping in the City' program, organized last summer, the Municipality of Larissa in collaboration with the citys stakeholders, the program Will be implemented this year as well.",
"__v": 0,
"comments": [
{
"updatedAt": "2017-06-08T16:19:03.547Z",
"createdAt": "2017-06-08T16:19:03.547Z",
"rating": 5,
"comment": "Λατρεύω το camping!!!",
"author": "Theo",
"_id": "593978f7995e071df49b08db"
},
{
"updatedAt": "2017-06-08T16:19:03.550Z",
"createdAt": "2017-06-08T16:19:03.550Z",
"rating": 5,
"comment": "Καλά μιλάμε τέλειο!!!",
"author": "Chris",
"_id": "593978f7995e071df49b08da"
},
{
"updatedAt": "2017-06-08T16:19:03.550Z",
"createdAt": "2017-06-08T16:19:03.550Z",
"rating": 2,
"comment": "Βαρετό.",
"author": "Σοφία.",
"_id": "593978f7995e071df49b08d9"
}
]
}
]
我的路线是这样写的
var express = require('express');
var bodyParser = require('body-parser');
var mongooser = require('mongoose');
var News = require('../models/news')
var newsRouter = express.Router();
newsRouter.use(bodyParser.json());
newsRouter.route('/')
.get(function(req,res,next){
News.find({},function(err,news){
if(err) throw err;
res.json(news);
});
})
.post(function(req,res,next){
News.create(req.body,function(err,news){
if(err) throw err;
console.log('News created')
var id = news._id;
res.writeHead(200,{
'Content-Type':'text/plain'
});
res.end('Added the article with id: ' + id);
})
})
.delete(function (req, res, next) {
News.remove({}, function (err, resp) {
if (err) throw err;
res.json(resp);
});
});
newsRouter.route('/:newsId')
.get(function (req, res, next) {
News.findById(req.params.newsId, function (err, news) {
if (err) throw err;
res.json(news);
});
})
.put(function (req, res, next) {
News.findByIdAndUpdate(req.params.newsId, {
$set: req.body
}, {
new: true
}, function (err, news) {
if (err) throw err;
res.json(news);
});
})
.delete(function (req, res, next) {
News.findByIdAndRemove(req.params.newsId, function (err, resp) {
if (err) throw err;
res.json(resp);
});
});
newsRouter.route('/:newsId/comments')
.get(function (req, res, next) {
News.findById(req.params.newsId, function (err, news) {
if (err) throw err;
res.json(news.comments);
});
})
.post(function (req, res, next) {
News.findById(req.params.newsId, function (err, news) {
if (err) throw err;
news.comments.push(req.body);
news.save(function (err, news) {
if (err) throw err;
console.log('Updated Comments!');
res.json(news);
});
});
})
.delete(function (req, res, next) {
News.findById(req.params.newsId, function (err, news) {
if (err) throw err;
for (var i = (news.comments.length - 1); i >= 0; i--) {
news.comments.id(news.comments[i]._id).remove();
}
news.save(function (err, result) {
if (err) throw err;
res.writeHead(200, {
'Content-Type': 'text/plain'
});
res.end('Deleted all comments!');
});
});
});
newsRouter.route('/:newsId/comments/:commentId')
.get(function (req, res, next) {
News.findById(req.params.newsId, function (err, news) {
if (err) throw err;
res.json(news.comments.id(req.params.commentId));
});
})
.put(function (req, res, next) {
// We delete the existing commment and insert the updated
// comment as a new comment
News.findById(req.params.newsId, function (err, news) {
if (err) throw err;
news.comments.id(req.params.commentId).remove();
news.comments.push(req.body);
news.save(function (err, news) {
if (err) throw err;
console.log('Updated Comments!');
res.json(news);
});
});
})
.delete(function (req, res, next) {
News.findById(req.params.newsId, function (err, news) {
news.comments.id(req.params.commentId).remove();
news.save(function (err, resp) {
if (err) throw err;
res.json(resp);
});
});
});
module.exports = newsRouter;
既然已经准备好了，我想使用 Angular.js 从客户端读取这个 json。所以我创建了一个工厂。
angular.module('larissaApp')
.constant('baseURL', 'http://localhost:3000/')
.factory('newsFactory',['$resource', 'baseURL', function($resource,baseURL) {
var newsfac = {};
newsfac.getNews = function(){
return $resource(baseURL+"news/:id",null, {'update':{method:'PUT' }});
};
return newsfac;
}])
还有一个控制器。
.controller('IndexController',['$scope','newsFactory','AnnouncementsFactory','EventsFactory',function($scope,newsFactory,AnnouncementsFactory,EventsFactory){
$scope.message="Loading ...";
$scope.newsOne = newsFactory.getNews().get({id:0})
.$promise.then(
function(response){
$scope.newsOne = response;
},
function(response) {
$scope.message = "Error: "+response.status + " " + response.statusText;
}
);
$scope.newsTwo = newsFactory.getNews().get({id:1})
.$promise.then(
function(response){
$scope.newsTwo = response;
$scope.showDish = true;
},
function(response) {
$scope.message = "Error: "+response.status + " " + response.statusText;
}
);
$scope.newsThree = newsFactory.getNews().get({id:2})
.$promise.then(
function(response){
$scope.newsTwo = response;
},
function(response) {
$scope.message = "Error: "+response.status + " " + response.statusText;
}
);
$scope.eventOne = EventsFactory.getEvents(0);
$scope.eventTwo = EventsFactory.getEvents(1);
$scope.eventThree = EventsFactory.getEvents(2);
$scope.announcementOne = AnnouncementsFactory.getAnnouncement(0);
$scope.announcementTwo = AnnouncementsFactory.getAnnouncement(1);
$scope.announcementThree = AnnouncementsFactory.getAnnouncement(2);
}])
你现在可以，我只动态阅读新闻。但是我在控制台中收到此错误。
events.js:160
throw er; // Unhandled 'error' event
^
CastError: Cast to ObjectId failed for value "0" at path "_id" for model "News"
at MongooseError.CastError (C:\Users\Theodosios\Desktop\larissa-node\larissa
App\rest-server\node_modules\mongoose\lib\error\cast.js:26:11)
at ObjectId.cast (C:\Users\Theodosios\Desktop\larissa-node\larissaApp\rest-s
erver\node_modules\mongoose\lib\schema\objectid.js:149:13)
at ObjectId.SchemaType._castForQuery (C:\Users\Theodosios\Desktop\larissa-no
de\larissaApp\rest-server\node_modules\mongoose\lib\schematype.js:1023:15)
at ObjectId.castForQuery (C:\Users\Theodosios\Desktop\larissa-node\larissaAp
p\rest-server\node_modules\mongoose\lib\schema\objectid.js:189:15)
at cast (C:\Users\Theodosios\Desktop\larissa-node\larissaApp\rest-server\nod
e_modules\mongoose\lib\cast.js:232:32)
at Query.cast (C:\Users\Theodosios\Desktop\larissa-node\larissaApp\rest-serv
er\node_modules\mongoose\lib\query.js:2933:12)
at Query.findOne (C:\Users\Theodosios\Desktop\larissa-node\larissaApp\rest-s
erver\node_modules\mongoose\lib\query.js:1394:10)
at Function.findOne (C:\Users\Theodosios\Desktop\larissa-node\larissaApp\res
t-server\node_modules\mongoose\lib\model.js:1360:13)
at Function.findById (C:\Users\Theodosios\Desktop\larissa-node\larissaApp\re
st-server\node_modules\mongoose\lib\model.js:1288:15)
at C:\Users\Theodosios\Desktop\larissa-node\larissaApp\rest-server\routes\ne
wsRouter.js:41:14
at Layer.handle [as handle_request] (C:\Users\Theodosios\Desktop\larissa-nod
e\larissaApp\rest-server\node_modules\express\lib\router\layer.js:95:5)
at next (C:\Users\Theodosios\Desktop\larissa-node\larissaApp\rest-server\nod
e_modules\express\lib\router\route.js:137:13)
at Route.dispatch (C:\Users\Theodosios\Desktop\larissa-node\larissaApp\rest-
server\node_modules\express\lib\router\route.js:112:3)
at Layer.handle [as handle_request] (C:\Users\Theodosios\Desktop\larissa-nod
e\larissaApp\rest-server\node_modules\express\lib\router\layer.js:95:5)
at C:\Users\Theodosios\Desktop\larissa-node\larissaApp\rest-server\node_modu
les\express\lib\router\index.js:281:22
at param (C:\Users\Theodosios\Desktop\larissa-node\larissaApp\rest-server\no
de_modules\express\lib\router\index.js:354:14)
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! rest-server@0.0.0 start: `node ./bin/www`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the rest-server@0.0.0 start script 'node ./bin/www'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the rest-server package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR! node ./bin/www
npm ERR! You can get information on how to open an issue for this project with:
npm ERR! npm bugs rest-server
npm ERR! Or if that isn't available, you can get their info via:
npm ERR! npm owner ls rest-server
npm ERR! There is likely additional logging output above.
npm ERR! A complete log of this run can be found in:
npm ERR! C:\Users\Theodosios\AppData\Roaming\npm-cache\_logs\2017-06-08T16_1
9_28_708Z-debug.log
如何解决此错误？正如我所说，邮递员一切正常。
谢谢，
西奥。
更新
我对我的 :/newsId 路由做了一些小改动。基本上我将 req.params.newsId 转换为猫鼬类型。
newsRouter.route('/:newsId')
.get(function (req, res, next) {
News.findById(req.params.newsId = mongoose.Types.ObjectId(req.params.newsId), function (err, news) {
if (err) throw err;
res.json(news);
console.log(req.body._id);
});
})
但是现在我得到了这个错误。
2angular.js:12587 GET http://localhost:3000/news/0 500 (Internal Server
Error)
index.html#!/:1 XMLHttpRequest cannot load http://localhost:3000/news/0. No
'Access-Control-Allow-Origin' header is present on the requested resource.
Origin 'http://127.0.0.1:61612' is therefore not allowed access. The
response had HTTP
【问题讨论】：
标签： javascript angularjs node.js mongodb mongoose