Get the return value from mongoose call back function Node.js

Question

I have written a function like this

function create(data, res){

    var history= new historyData({
        owner: data
    });

    historyData.save(function(err, historyData) {


        //To identify the error
        if (err) {


            console.log(err);
        }

        //If no error pass the team details to databsae
        else {

            return historyData.id;       

        }
    });
}

and I'm trying to get the return value like this

var history = create("saddsa", res);

but it gives undefined error

I want to get the id of the created collection and pass it to another function?

So how can i get the saved data id and pass to another function?? @AshishSuthar — Kokulan
– Kokulan, Commented Sep 25, 2016 at 4:12
you can give a callback function and get that data from there — abdulbari
– abdulbari, Commented Sep 25, 2016 at 4:13

abdulbari · Accepted Answer · 2016-09-25 04:23:18Z

1

Try to return a callback and get that value

function create(data, res, callback) {

  var history = new historyData({
    owner: data
  });

  historyData.save(function(err, historyData) {
    //To identify the error
    if (err) {
      console.log(err);
      callback(err)
    }

    //If no error pass the team details to databsae
    else {
      return callback(null,historyData.id);

    }
  });
}

 // call your function like this    
  create("saddsa", res,function(err,result){
      if(!err){
        console.log(result)
      }
    });

edited Sep 25, 2016 at 4:23

answered Sep 25, 2016 at 4:15

abdulbari

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8 Comments

abdulbari Over a year ago

are you getting value in historyData.id after saving?

Kokulan Over a year ago

yes i'm getting and in the callback functions result i'm getting the id but couldn't get it to a variable

abdulbari Over a year ago

check your historyData.id when return after saving? console.log(historyData.id)

abdulbari Over a year ago

It should work, if you get value in callback(null,historyData.id);

abdulbari Over a year ago

If you do not get error and enter in else condition put callback(null,historyData); And get that value like at calling time if (!err){ console.log(historyData)//if you get right value then access historyData.id }

|

asissuthar · Accepted Answer · 2016-09-25 04:18:30Z

0

replace

return historyData.id;

with

if(res) res(historyData.id);

and call

create("saddsa", function (id) { var history = id; });

answered Sep 25, 2016 at 4:18

asissuthar

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1 Comment

abdulbari Over a year ago

It's not gonna work. Have you test it? Define proper callback with proper parameters(err,value)

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