Parameters in mapreduce

[730.saurabh]

I am new to mongodb.

I am trying to pass parameter to mapreduce but it gives error as following,

Setting up the file resolver... com.mongodb.util.JSONParseException:  {  'collectionName' : 'range',   mapReduce : { map : 'function () { if(this.user == {'select':null}){  emit (this._id,{userid:this.user.valueOf()}); } 

 

For some reason the parameter is returned as null. My map function is as follows,

map : 'function () {

                         if(this.user == $P{select})

                        {

                         emit (this._id,{userid:this.user.valueOf()});

                        }

                        }',

Can anyone please point out my mistake?