var MongoClient = require('mongodb').MongoClient;
MongoClient.connect('mongodb://localhost:27017/school', function(err, db){
	if (err) throw err;
	var students = db.collection('students');
	var cursor = students.find({'scores.type':'homework'});
	cursor.sort('score', 1);
	cursor.each()(function(err, doc){
		if(err) throw err;
		console.dir(doc);
	})
})