MongoDB Product MapReduce 1

gistfile1.js

map = function map(){
    //key olarak product type 
    //value olarak ise obje icinde product price alanına gore mapliyoruz 
    emit(this.type, {price:this.price} );
}

reduce = function reduce(key,values) {
    var result = { sumProductPrice: 0 };

    values.forEach(function(value) {
       result.sumProductPrice += value.price
    });
  
    return result;
}

> db.product.mapReduce(map, reduce, {out:"productMapReduce1"})
{
	"result" : "productMapReduce1",
	"timeMillis" : 377,
	"counts" : {
	"input" : 6,
	"emit" : 6,
	"reduce" : 2,
	"output" : 2
	},
	"ok" : 1,
}

> db.productMapReduce1.find()
{ "_id" : "Shirt", "value" : { "sumProductPrice" : 50 } }
{ "_id" : "Sweat Shirt", "value" : { "sumProductPrice" : 95 } }