Q Promise Nodejs how to resolve in loop - node.js

Question

i have code written in nodejs make me confusying using Q Promises
theFunction()
.then(function(data) {
var deferred = Q.defer()
var result = [];
for(i=0; i < data.length; i++) {
secondFunc(data.item)
.then(function(data2) {
data.more = data2.item
});
result.push(data);
}
deferred.resolve(result);
deferred.promise();
});
i want data in second function inside loop can push into result
so my previous data is like this
[
{
id: 1,
item: 1,
hero: 2
},
{
id: 1,
item: 1,
hero: 2
}
]
and so like this
[
{
id: 1,
item: 1,
hero: 2,
more: {
list: 1
}
},
{
id: 1,
item: 1,
hero: 2,
more: {
list: 4
}
}
]
I've tried several ways start by entering the command
deferred.resolve (); statement in the loop and only showing 1 data
have any solution ?

Answer 1

Instead of a deferred.resolve() on an array which will resolve immediately, use Q.all which waits for an array of promises:
theFunction()
.then(function(data) {
var result = [];
for(var i=0; i < data.length; i++) (function(i){
result.push(secondFunc(data[i].item)
.then(function(data2) {
data[i].more = data2.item;
return data[i];
}));
})(i); // avoid the closure loop problem
return Q.all(result)
});
Or even better:
theFunction()
.then(function(data) {
return Q.all(data.map(function(item)
return secondFunc(item)
.then(function(data2) {
item.more = data2.item;
return item;
});
});
});

Answer 2

I know this is a older post but I've the same problem and did not found any solution. Maybe someone here find a good solution very fast.
function CompareTeamspeakClients(forumUsers) {
var promises = [];
var tsClient = new TeamSpeakClient("127.0.0.1", 10011);
tsClient.send("login", {
client_login_name: "serveradmin",
client_login_password: "M+h8YzUA"
}, function(err, response){
if (err) deferred.reject(err);
});
tsClient.send("use", {
port: 9987
}, function(err, response){
if (err) deferred.reject(err);
});
forumUsers.forEach(function(user, index){
var deferred = Q.defer();
tsClient.send("clientdbfind", ["uid"], {
pattern: user.tsid
}, function(err, response){
if (err) deferred.reject(err);
if (response) {
tsClient.send("clientdbinfo", {
cldbid: response.cldbid
}, function(err, response){
if (err) deferred.reject(err);
forumUsers[index]['tsdbid'] = response.client_database_id;
forumUsers[index]['tsnickname'] = response.client_nickname;
forumUsers[index]['tslastconnected'] = response.client_lastconnected;
deferred.resolve(forumUsers);
});
}
});
promises.push(deferred.promise);
});
console.log(promises);
return Q.all(promises);
}