返回节点函数中的解决错误 [英] return resolve error in node function
问题描述
为什么usernametoid函数不会返回acual id?导致即时通讯试图发送用户数据的结果作为返回.在这种情况下,我只想发送userdata的_id属性.但似乎无法正常工作.
Why wont usernametoid function return the acual id? cause im trying to send the result of the userdata as the return. In this case, i want to only send the userdata`s _id attribute. but it seems like it wont work.
console.log(userdata._id); // works
return resolve(userdata._id); // wont work.
可变用户数据的输出:
{
cash: 7300002,
bank: 0,
xp: 0,
rank: 1,
points: 1,
location: 1,
health: 100,
protection: 1,
attack: 1,
family: '0',
password: 'jKa4qC7pRCgE5jvzD9Vv1pRUNxFlQEM7Jpq/IoJ/sUWOAv1Wx1RI/j/Vu6Zf8zyNkCFcg3QBtdfAC+lmPS8KIA==',
profileImageURL: 'modules/users/client/img/profile/default.png',
roles: [ 'user' ],
created: Sat Aug 27 2016 12:33:55 GMT-0400 (EDT),
__v: 0,
username: 'signature',
provider: 'local',
salt: '4ySlrr9ggESxBB3dR5bx4Q==',
_id: 57c1c0f3b6b20c011242bf22 }
当我这样做时:`返回resolve(userdata._id)会得到此错误:
when i do: `return resolve(userdata._id) it would get this error:
/server/factory/user_factory.js:52
return resolve(userdata._id);
^
TypeError: Cannot read property '_id' of null
node.js调用:
node.js call:
var articles = require('../controllers/articles.server.controller'),
path = require('path'),
mongoose = require('mongoose'),
Article = mongoose.model('Article'),
Users = mongoose.model('User'),
errorHandler = require(path.resolve('./modules/core/server/controllers/errors.server.controller'));
var userFunc = require('../factory/user_factory.js');
app.post('/api/kill', function (req, res) {
console.log("starting");
var username = "signature";//req.query.username;
var result = ["test service"];
var data = req.user;
userFunc.usernametoid(username).then( function (otherplayerid) {
if (!(otherplayerid)) {
console.log("other player is acually " + otherplayerid);
result.push("denne brukeren finnes ikke! " + otherplayerid);
} else {
userFunc.usernametoid(otherplayerid).then( function (otherplayer) {
if (data.location != otherplayer.location) {
result.push("Du er ikke i samme lokasjon som " + username);
result.push(data.location + " vs " + otherplayer.location);
} else {
userFunc.addCash(req.user._id,100000);
result.push("starter lokasjonisering");
}
});
}
res.json(result);
});
});
用户工厂:
var articles = require('../controllers/articles.server.controller'),
path = require('path'),
mongoose = require('mongoose'),
Article = mongoose.model('Article'),
Users = mongoose.model('User'),
errorHandler = require(path.resolve('./modules/core/server/controllers/errors.server.controller'));
exports.usernametoid = usernametoid;
function usernametoid(id) {
return new Promise( function (resolve, reject) {
var query = Users.findOne( { username : id } );
// var query = Users.find({_id:id});
query.exec(function(err, userdata) {
if (err){
return reject({err : 'Error while getting user info'});
}
console.log(userdata._id);
return resolve(userdata);
});
}, function (){
return reject({err : 'error while fetching cash'});
});
}
推荐答案
因为您没有正确将获取的用户传递给query.exec
.
Because you are not passing correctly the fetched user to the query.exec
.
您需要这样做:
var Users = require('../models/users-model.js');
function usernametoid(id) {
return new Promise( function (resolve, reject) {
Users.findOne({ username : id }).then( function(user){
//If you use lodash you can do _.isNull(user)
if(user == null){
return reject({error : 'User not found'});
}
user.exec(function(userdata, error) {
if(userdata){
return resolve(userdata);
}
if(error){
return reject({error : 'Error while executing query'});
}
});
});
});
}
我真的不明白为什么要这样导入Users Model
.我认为Node
将无法像这样获取它.
I don't really get why you are importing Users Model
like that. I do not think Node
will be able to fetch it like that.
而且,您应该在server.js
要捕获拒绝,您需要以下代码:
To catch the rejection you need the following code:
UserFactory.userNameToId(id).then( function(response){
if(response.error){
console.log('error '+response.error);
}
if(response){
console.log('Got response '+response);
}
});
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