node.js - MapReduce in keystone- giving error -


this mapreduce code nodejs works fine & perfect

var server = new server('localhost', 27017, {auto_reconnect: true}); db = new db('test1', server); db.open(function(err, db) {     if(err)  console.log("connected 'driverb' database");      db.collection('users', function(err, collection) {               var map = function() {                       emit(this.username.substr(this.username.indexof('@') + 1),1);                 };                var reduce = function(host, count) {                       return array.sum(count) ;                };              collection.mapreduce(map, reduce, {                 out: "domain"                };              }           );           });

now wrote similar kind of code keystone throwing me error in next block. writing code part of upgrade migration script. 

var keystone = require('keystone'); var user = keystone.list('user');  exports = module.exports = function(done) {    var map = function() {     emit(this.username.substr(this.username.indexof('@') + 1),1);   };    var reduce = function(host, count) {     return array.sum(count) ;   };   //user.model.mapreduce   user.model.mapreduce(map, reduce, {     out: "domain"   });   done();

this error above output of code. 

/path//node_modules/keystone/node_modules/mongodb/lib/mongodb/collection/aggregation.js:42     throw new error("the out option parameter must defined, see mongodb docs possible values");     ^  error: out option parameter must defined, see mongodb docs possible values     @ collection.mapreduce (/path//node_modules/keystone/node_modules/mongodb/lib/mongodb/collection/aggregation.js:42:11)     @ nativecollection.(anonymous function) [as mapreduce] (/path//node_modules/keystone/node_modules/mongoose/lib/drivers/node-mongodb-native/collection.js:135:28)     @ function.mapreduce (/path//node_modules/keystone/node_modules/mongoose/lib/model.js:1729:19)     @ module.exports (/path//updates/0.0.5-domaincreate.js:14:14)     @ promise.<anonymous> (/path//node_modules/keystone/lib/updates.js:108:6)     @ promise.<anonymous> (/path//node_modules/keystone/node_modules/mongoose/node_modules/mpromise/lib/promise.js:177:8)     @ emitone (events.js:96:13)     @ promise.emit (events.js:188:7)     @ promise.emit (/path//node_modules/keystone/node_modules/mongoose/node_modules/mpromise/lib/promise.js:84:38)     @ promise.fulfill (/path//node_modules/keystone/node_modules/mongoose/node_modules/mpromise/lib/promise.js:97:20)     @ immediate.cb (/path//node_modules/keystone/node_modules/mongoose/lib/query.js:1153:30)     @ immediate.<anonymous> (/path//node_modules/mquery/lib/utils.js:137:16)     @ runcallback (timers.js:637:20)     @ tryonimmediate (timers.js:610:5)     @ processimmediate [as _immediatecallback] (timers.js:582:5)  process finished exit code 1

any suggestions why error coming on keystone . refrence good


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