View difference between Paste ID: Azv60vLD and j0Mnf7jP

 I am doing a node.js and mongo assignment...
 The test is to loop through a mongoDB find the lowest grade scores, and remove them.  I was able to write something that would find the lowest grades, remove them from a secondary var with splice()
 but now I want to update the original document with the new array... and this is the part I am having difficulty with.
 
 the first code is really just the PRETTY() version of some mondodb records that I am querrying... the SCORES array is the important part.
 The second program will create a doc and doc.scores with the corrected data.  But I am trying to update the original DOC with the new data.  Not sure how to do this.
 
 ~~~
 > db.students.find({_id:113}).pretty();
 {
 	"_id" : 113,
 	"name" : "",
 	"scores" : [
 		{
 			"type" : "exam",
 			"score" : 77.57315913088024
 		},
 		{
 			"type" : "quiz",
 			"score" : 13.28135073340091
 		},
 		{
 			"type" : "homework",
 			"score" : 67.27527802263116
 		},
 		{
 			"type" : "homework",
 			"score" : 55.74198976046431
 		}
 	]
 }
 
 ~~~
 
 my program would splice out doc.scores[1] which has the lowest score.
 
 Now I want to update the original db.  My code is below...
 
 
 ~~~
 
 var MongoClient = require('mongodb').MongoClient;
 MongoClient.connect('mongodb://localhost:27017/school',
                     function(err, db) {
 
                      if(err) throw(err);
 
                       var cur = db.collection('students').find({}).sort({name:1});
                       var updates = 0;
                       var curDone=false;
                       cur.each(function(err, doc){
                         if(err) throw err;
                         if (doc != null){
                           console.dir(doc._id + "--  record "+ doc.name);
 
                           zz = doc.scores;
                           zzlowScore = zz[0].score;
                           zzlowScoreIndex = 0;
                           for(var i = 0, l = zz.length; i < l; i++ ){
                             console.dir("========zz--Index "+i+" ---  score: "+ zz[i].score);
                             if(zzlowScore > zz[i].score){
                             //we have a new low score and index
                                   zzlowScore = zz[i].score;
                                   zzlowScoreIndex= i;
                                 };
                           };
 
                             console.dir("===  low score Index "+zzlowScoreIndex + "  ==lowscore== "+zzlowScore);
 
                             console.dir("..............remove the bad stuff..."+ doc._id);
                             doc.scores.splice(zzlowScoreIndex,1);
 
                           zz = doc.scores;
                           for(var i = 0, l = zz.length; i < l; i++ ){
                             console.dir("====zz--Index "+i+" ---  score: "+ zz[i].score);
                               };
 console.dir("============================================================================");
                             //doc.update({_id:doc._id},{scores:zz});
                             //db.collection('students').update({_id:doc._id},{scores:zz});
 //
 //Now I need to pass the new doc.scores back to the DB so it can update scores subarray.
 //But not sure how to do this.
 
 
 
-//cur.update({_id:doc._id},$set:{scores:zz});
+//cur.update({_id:doc._id},{$set:{scores:zz}});
 db.schools.update({_id:doc._id},$set:{scores:zz});
 //!!!!!!!!!!!!!!   THIS IS THE PART I CAN NOT FIGURE OUT.  HOW TO UPDATE ORIGINAL DOC??????
 
 //return doc.scores;
 
                         }else{
                           db.close();
                         };
 
 
                         console.dir("++++++++++++++++++++++++++++++++++++++++++");
 
 
                       });
                     });
 
 
 ~~~