node.js - Mongoose Async Call Issue with Find Query -


i have var movierecommendation being populated data coming mongo db. issue mongoose movie.findone() call asycn call not allowing me final populated movierecommendation need send response.

exports.getrecommendation=function(req,res){ var movierecommendation = []; var id=req.params.id; console.log('----- user recommendation - ' +  id); var url = 'http://52.8.48.113:8080/recommender-server/recommender/v1/recommendations/'+id+'.do'; //make http request request({     url: url,     json: true }, function (error, response, recommendations) {        // res.json(recommendations);      if (!error && response.statuscode === 200) {         recommendations.foreach(function(entry) {               **movie.findone({'id':parseint(entry.itemid)},function(err, moviedata){**                 entry.movie = moviedata;                 movierecommendation.push(entry);                //console.log('rec', movierecommendation);                  console.log(movierecommendation.length);             });           });      }     console.log("====final========"+movierecommendation.length);     //output = 0  });      res.json(movierecommendation); // here movierecommendation coming black array  };

please let me know how can populated movierecommendation var @ end make available response.

for type of issues can use async library. populate data once operations done, can use async.each collection async library.

for example: note:install async command npm install async use async library

    var async = require("async");      var recomenmendations = [{"data2" : "value2"} , {"data1" : "value2"}, {"data3" : "value3"}, {"data4" : "value4"} ]        var movierecommendation = [];      async.each(recomenmendations,        function(recomenmendationitem, callback){               console.log("here can query required data using current recomenmendations item");             console.log(recomenmendationitem);             callback();               // movie.find({'id':parseint(recomenmendationitem.itemid)},function(err, moviedata){            //           recomenmendationitem.movie = moviedata;           //           movierecommendation.push(entry);           //        callback();                   //    });          },        function(err){          console.log("here can send resopnse");         console.log("this section executed once recomenmendations processed");         //res.json(movierecommendation)        }     );

you can query mongodb shown comment section. should use callback() once operations performed iteration.


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