mongodb - count embeded objects

Bir alana gore embeded objeleri saymak icin su sekilde yapiyorum

	var map = function() { emit(this.e, { notifications : this.notifications});};
	var reduce = function(key, values) {
	var count = 0;
	values.forEach(function(docs) {
	for(var doc in docs.notifications){
	if(docs.notifications[doc].date>1332836355){
	count+=1;
	}
	}
	});
	return { c : count};
	};
	db.collection1.mapReduce(map, reduce, {out: collection2});

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