猫鼬填充返回空数组 [英] Mongoose Populate returns empty array
问题描述
我收到的空数组包含以下代码:
I am receiving an empty array with the following code:
var mongoose = require('mongoose');
var db = mongoose.createConnection('localhost', 'mytestapp');
var SurveySchema = require('../models/Survey.js').SurveySchema;
var Survey = mongoose.model('SurveySchema', SurveySchema, 'surveys');
var UserSchema = require('../models/Survey.js').User;
var User = mongoose.model('user', UserSchema, 'users');
exports.getSurveysForUser = function(User) {
return function (req, res) {
User
.findOne({_id: req.params.userId})
.populate('surveys')
.exec(function (err, user){
if (err) return res.json({error: err})
else {
var surveyList=[];
surveyList = user.surveys;
console.log(surveyList);
console.log("user: "+ user);
res.json(surveyList);
}
});
}};
这是控制台输出:
[ ]
user: { __v: 2,
_id: 52939b8c22a7efb720000003,
email: 'a@b.de',
password: '202cb962ac59075b964b07152d234b70',
surveys: []
}
这些是猫鼬模型:
exports.SurveySchema = new Mongoose.Schema({
description : String,
questions : [question] });
exports.User = new Mongoose.Schema({
name : String,
email: { type: String, unique: true },
password: { type: String, required: true},
surveys : [{type: Schema.ObjectId, ref: 'SurveySchema'}] });
顺便说一句:
我已经尝试了User.findOne(...)，然后在回调中尝试了Survey.find().似乎第二条语句甚至没有执行.显然，我对猫鼬非常陌生..我找不到解决此问题的方法
I already tried User.findOne(...) and then a Survey.find() in the callback. It seemed that the second statement was not even executed. Apparently i am very new to mongoose..and i can't find a way around this problem
您有什么想法可以帮助我吗? 我在这里真的找不到任何有用的解决方案，但问题不应该是一个大问题. 在此先感谢您，这真的让我好几天了！
Do you have any ideas how to help me? I couldn't really find any helpful solution here, but the problem shouldn't be a big one. Thanks in advance, its really keeping me up for days now!!
这是带有方法的index.js:
So this is the index.js with the method:
var mongoose = require('mongoose');
var db = mongoose.createConnection('localhost', 'mytestapp');
var SurveySchema = require('../models/Survey.js').SurveySchema;
var Survey = mongoose.model('SurveySchema', SurveySchema, 'surveys');
var UserSchema = require('../models/Survey.js').User;
var User = mongoose.model('user', UserSchema, 'users');
//.. here are some more methods..
exports.getSurveysForUser = function(User) {
return function (req, res) {
User
.findOne({_id: req.params.userId})
.populate('surveys')
.exec(function (err, user){
if (err) return res.json({error: err})
else {
var surveyList=[];
surveyList = user.surveys;
console.log(surveyList);
console.log("user: "+ user);
res.json(surveyList);
}
});
}};
//this is the code, that saves a response to a survey
exports.addResponse = function(ResponseSet) {
return function (req, res) {
console.log("bin da: addResponse");
console.log("response zu: " + req.body.surveyId);
console.log("von user : " + req.body.userId);
//für user speichern
var pUser = User.findOne({_id:req.body.userId}, function (error, user) {
// Maybe populate doesnt work, because i only push the ID?
user.surveys.push(Mongoose.Types.ObjectId(req.body.surveyId));
user.save();
}
);
var pSurvey = Survey.findOne({_id:req.body.surveyId}, function (error, survey) {
survey.responses.push(Mongoose.Types.ObjectId(req.params.id));
survey.save();
}
);
//responseSet speichern
var responseSet = new ResponseSet(req.body);
responseSet.save(function(error, responseSet) {
if (error || !responseSet) {
res.json({ error : error });
} else {
res.json(responseSet);
}
});
};
};
这是app.js，它消耗了index.js:
And this is the app.js, which consumes the index.js:
var Mongoose = require('mongoose');
var db = Mongoose.createConnection('localhost', 'mytestapp');
var SurveySchema = require('./models/Survey.js').SurveySchema;
var Survey = db.model('surveys', SurveySchema);
var UserSchema = require('./models/Survey.js').User;
var User = db.model('user', UserSchema);
var ResponseSetSchema = require ('./models/Survey.js').responseSet;
var ResponseSet = db.model('responseSet', ResponseSetSchema);
var express = require('express')
, routes = require('./routes')
, http = require('http')
, path = require('path')
, passport = require('passport')
, pass = require('./config/pass')
, user_routes = require('./routes/user');
var app = express();
// all environments
app.set('port', process.env.PORT || 3000);
app.set('views', __dirname + '/views/app');
//app.engine('html', require('ejs').renderFile);
app.use(express.static(__dirname + '/views/app'));
app.use(express.cookieParser());
app.use(express.favicon());
app.use(express.logger('dev'));
app.use(express.bodyParser());
app.use(express.methodOverride());
app.use(express.session({ secret: 'securedsession' }));
app.use(passport.initialize()); // Add passport initialization
app.use(passport.session()); // Add passport initialization
app.use(app.router);
app.use(express.static(path.join(__dirname, 'public')));
// development only
if ('development' == app.get('env')) {
app.use(express.errorHandler());
}
app.all('/secure', pass.ensureAuthenticated);
app.get('/', function (req, res)
{
res.render('index.html');
} );
// some more code...
app.get('/api/secure/userSurveys/:userId', routes.getSurveysForUser(User));
http.createServer(app).listen(app.get('port'), function(){
console.log('Express server listening on port ' + app.get('port'));
});
希望它有助于解决问题！ 在此先谢谢了！！ :)
Hope it helpsto fight the problem! Many many thanks in advance!! :)
推荐答案
所以我找到了解决方案！ 首先，似乎猫鼬模式不是正确需要的.
So i found a solution! Firstly it seemed, that the mongoose Schemas were not correctly required.
所以在模型中，我做了mongoose.model('modelname'，schemaname);对于每个模型，现在我只对index.js中的每个模型使用mongoose.model(...).
So in the models, i did mongoose.model('modelname', schemaname); for every model and now i only use mongoose.model(...) for every model in the index.js.
第二，我发现了一个更关键的事情:突然没有user.surtests为我的测试用户了！我确信几天前它充满了调查.因为我多次测试了我的代码，所以一些调查被推到了那个集合中.也许我在一些测试中丢掉了它..我真的不记得了.因此，我在mongodb控制台中手动推送了一项调查，然后再次对其进行了测试->起作用了！ user.surveys已填充！也许该功能昨天就起作用了，不需要任何更改.很抱歉，如果那是浪费时间.
Secondly i found out about an even more critical thing: There were suddenly no user.surveys for my testuser anymore! I am sure that it was filled with surveys a few days ago. Because i tested my code several times and some surveys were pushed to that collection. Maybe i dropped the collection it in some testing..i don't really remember. So i pushed a survey manually in the mongodb console and tested it again --> worked! the user.surveys were populated! maybe the function worked yesterday and didn't need any change. I am so sorry, if that was a waste of time.
不好的是，现在exports.addResponse(....)仅保存响应，但没有将ID推送到user.surveys和survey.responses数组.这似乎是一个同步问题，我将以某种方式解决.
Bad thing is, that right now the exports.addResponse(....) is only saving a response, but is not pushing the IDs to the arrays user.surveys and survey.responses. This seems to be a synchronizing Problem and i will figure that out somehow.
无论如何，谢谢您的帮助和时间！
Anyways, thank you for your help and time!
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