map-reduce result

var o = {};
o.map = map;
o.reduce = reduce;

if(time!=null)
{
	o.query = {time: {$gte: time}};
}

collection.mapReduce(o, function(err,result) {
	result.forEach(function(order) {
		order._id = order._id.getTime();
	});
	res.json(result);
});