Map Reduce

mr2

var map = function(){
	emit(this.tag, {tag_date: this.tag_date, count:this.count});
}

var reduce = function(key, values){
	var obj = {value: []};
	for(var i in values){
		obj.value.push({tag_date:values[i].tag_date, count:values[i].count});
	}
	return obj;
}