javascript - using new keyword in callback causes "TypeError: object is not a function" -


i have call: 

var serve = function(teacher, callback) {      re.createfakememberdata(function(err, avgmember) {            //omitted       }); };

inside createfakememberdata, if try instantiate mongoose model:

var statistic = new statistic();

i error stack trace: 

d:\orkun\workspace\teb\tebesir-repo\scripts\engines\resetengine.js:61     var statistic = new statistic();                     ^ typeerror: object not function     @ object.createfakememberdata (d:\orkun\workspace\teb\tebesir-repo\scripts\engines\resetengine.js:61:21)     @ promise.<anonymous> (d:\orkun\workspace\teb\tebesir-repo\scripts\servlets\graph\servespider-teacher.js:29:20)     @ promise.<anonymous> (d:\orkun\workspace\teb\tebesir-repo\node_modules\mongoose\node_modules\mpromise\lib\promise.js:177:8)     @ promise.emit (events.js:95:17)

i think 'this' going out of scope or sth. have tried using bind..

re.createfakememberdata(function(err, avgmember) {                //omitted           }).bind(this);

no joy..

edit: statistic

// external libs going used var bunyan = require('bunyan'); var mongoose = require('mongoose'); var _ = require('underscore'); var schema = mongoose.schema;  // models going used var subject = require('../../scripts/models/subject'); var cf = require('../../scripts/utilities/commonfunctions'); var resetengine = require('../engines/resetengine'); var metricengine = require('../engines/metricengine'); var constants = require('../../scripts/utilities/constants');  var log = bunyan.createlogger({src: true, name: 'logstatistics'});  var statistic = new schema( {    solved_tot: {type: number, default : 0}, // number    score_tot: {type: number, default : 0}, // score    time_tot: {type: number, default : 0}, // time     // statistics subjects available client    stats: [{         stat_id: { type: string, required: true},         stat_name: { type: string, required: true},         stat_solved: { type: number, default : 0},         stat_score: { type: number, default : 0},         stat_time: { type: number, default : 0}    }]  }, { strict: true });  // !param new_score book has been bought book // !param new_time of user makes buy string // !param test_solved book has been bought book // !desc should async performance opt statistic.methods.updatestatisticsfromtest = function(test_solved, new_time, new_score, callback) {      (var = 0; < test_solved.subjects.length; i++) {         (var k = 0; k < this.stats.length; ++k) {              if (test_solved.subjects[i].subject_name == this.stats[k].stat_name) {                  // set current variables                 var current_score = this.stats[k].stat_score;                 var current_time = this.stats[k].stat_time;                 var current_solved = this.stats[k].stat_solved;                  // calculate , update 3 indexes                 this.stats[k].stat_score = (((current_score * current_solved) + new_score) / (current_solved + 1)).tofixed(5);                 this.stats[k].stat_time = (((current_time * current_solved) + new_time) / (current_solved + 1)).tofixed(5);                 this.stats[k].stat_solved++;                  break;             }         }     }      // calculate average total time     this.time_tot = (((this.time_tot * this.solved_tot) + new_time) / (this.solved_tot + 1)).tofixed(5);      // calculate average score     this.score_tot = (((this.score_tot * this.solved_tot) + new_score) / (this.solved_tot + 1)).tofixed(5);      // increase number of tests solved     this.solved_tot++;      // save new user stat     this.save(function(err) {         if (cf.errorcheck(err, constants.db_error, 'save statistic')) return callback(err);         return callback(null, this);     }); };  // !brief creates empty subject statistics object new user // !param subjectlist (array<subject>) list of subjects included statistics // !callback function called when database query ends statistic.methods.createstatistics = function(subjectlist) {      // initialize , add subjects statistics object     this.stats = [];     (var = 0; < subjectlist.length; i++) {         this.stats.push({'stat_id': subjectlist[i].id.tostring(), 'stat_name' : subjectlist[i].name});     } };  // !brief aggregates subject statistics on single topic statistics // !param subjectstatisticsobjectlist ( array <statistic> ) subject statistics aggregated statistic.methods.aggregatestatistic = function(statisticsobjectlist) {      resetengine.resetstatistic(this);     (var = 0; < statisticsobjectlist.length; i++) {          this.solved_tot += statisticsobjectlist[i].solved_tot;         this.time_tot += statisticsobjectlist[i].time_tot;         this.score_tot += statisticsobjectlist[i].score_tot * statisticsobjectlist[i].solved_tot;          (var k = 0; k < statisticsobjectlist[i].stats.length; k++) {              this.stats[k].stat_solved += statisticsobjectlist[i].stats[k].stat_solved;             this.stats[k].stat_score += statisticsobjectlist[i].stats[k].stat_score / statisticsobjectlist.length;             this.stats[k].stat_time += statisticsobjectlist[i].stats[k].stat_time;             this.stats[k].subject_watch += statisticsobjectlist[i].stats[k].subject_watch;         }     }      this.score_tot = this.score_tot / statisticsobjectlist.length;     resetengine.roundstatistic(this); };  // !brief gets topic statistics in object belong subject // !param thesubject ( subject ) subject going search // !param topiclist ( array<topic> ) topic lists going searched // !return (array<topic>) test found function statistic.methods.gettopicstatblobbysubject = function(subjectobject, topiclist) {      var topicstatisticsofsubject = [];     (var = 0; < topiclist.length; i++) {         if (topiclist[i].subject === subjectobject._id.tostring()) {             (var k = 0; k < this.stats.length; k++) {                 if (this.stats[k].stat_id === topiclist[i]._id.tostring()) {                     topicstatisticsofsubject.push(this.stats[k]);                     break;                 }             }         }     }      return topicstatisticsofsubject; };  // !brief find blob belongs given subject or topic name // !param statname ( string ) name of subject or topic blob found // !return subjectblob or topicblob (statistic.stats) statistic.methods.getstatblob = function(statname) {      (var = 0; < this.stats.length; i++) {         if (this.stats[i].stat_name === statname) {             return this.stats[i];         }     } };  module.exports = mongoose.model('statistic' , statistic);


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