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Accessing original field in Parse.com Cloud Code beforeSave function

The ultimate goal is to detect changes between an existing Parse object and the incoming update using the beforeSave function in Cloud Code.
From the Cloud Code log available through parse.com, one can see the input to beforeSave contains a field called original and another one called update.
Cloud Code log:
Input: {"original": { ... }, "update":{...}
I wonder if, and how, we can access the original field in order to detect changing fields before saving.
Note that I've already tried several approaches for solving this without success:
using (object).changedAttributes()
using (object).previousAttributes()
fetching the existing object, before updating it with the new data
Note on request.object.changedAttributes():
returns false when using in beforeSave and afterSave -- see below for more details:
Log for before_save -- summarised for readability:
Input: { original: {units: '10'}, update: {units: '11'} }
Result: Update changed to { units: '11' }
[timestamp] false <--- console.log(request.object.changedAttributes())
Log for corresponding after_save:
[timestamp] false <--- console.log(request.object.changedAttributes())

There is a problem with changedAttributes(). It seems to answer false all the time -- or at least in beforeSave, where it would reasonably be needed. (See here, as well as other similar posts)
Here's a general purpose work-around to do what changedAttributes ought to do.
// use underscore for _.map() since its great to have underscore anyway
// or use JS map if you prefer...
var _ = require('underscore');
function changesOn(object, klass) {
var query = new Parse.Query(klass);
return query.get(object.id).then(function(savedObject) {
return _.map(object.dirtyKeys(), function(key) {
return { oldValue: savedObject.get(key), newValue: object.get(key) }
});
});
}
// my mre beforeSave looks like this
Parse.Cloud.beforeSave("Dummy", function(request, response) {
var object = request.object;
var changedAttributes = object.changedAttributes();
console.log("changed attributes = " + JSON.stringify(changedAttributes)); // null indeed!
changesOn(object, "Dummy").then(function(changes) {
console.log("DIY changed attributes = " + JSON.stringify(changes));
response.success();
}, function(error) {
response.error(error);
});
});
When I change someAttribute (a number column on a Dummy instance) from 32 to 1222 via client code or data browser, the log shows this:
I2015-06-30T20:22:39.886Z]changed attributes = false
I2015-06-30T20:22:39.988Z]DIY changed attributes =
[{"oldValue":32,"newValue":1222}]

quickblox - javascript can i get list of users sort by name?

I would like to get the list of users ordered by name and with the new users first.
I've used the documentation reference: http://quickblox.com/developers/Users#Sort
I've trying this code but it is not working at all:
function QBlistUsers(page) {
var userParams = {};
var page = currentPage;
{userParams.perPage = itemsPerPage;}
{userParams.pageNo = page;}
{userParams.order = ['desc','string','full_name'];}
//{userParams.order = 'desc+string+full_name';} // I've try this too, instead of the previous line
//load new rows per page
QB.users.listUsers(userParams, function(err, response){...}
The response is simply ignoring the param "order". I'm I doing something wrong?
thanks for helping

Look at new version of JS SDK 1.2.0:
http://quickblox.com/developers/Javascript
var params = {
order: { sort: 'desc', field: 'full_name' },
per_page: itemsPerPage,
page: page
};
QB.users.listUsers(params, function(error, response){
// callback function
});

Current version of WebSDK supports only 'in' parameter from Users filters. But we are already working on new version which will have all these filter cases. I think, through two / three days it will be released.

Try passing the order parameter like below and let me know whether it is working or not.
QB.users.listUsers({ order:'desc'+'string'+'full_name'}, function(error, response){
if(error) {
console.log(error);
} else {
// Success
}
});

Trying to write to User class parse, masterkey is not working

I want to update a field within the User class without being logged in as a user. From reading online and other responses people say I should use the 'masterkey' to do so. Here is my cloud code where I have added in the master key. The code is executed but when I go to my data browser the totalScore and predictions values are still the same and not updated to the new values.
Parse.initialize("key", "key");
Parse.Cloud.define("userUpdate", function(request, response) {
Parse.Cloud.useMasterKey();
var publicReadACL = new Parse.ACL();
publicReadACL.setPublicWriteAccess(true);
request.object.setACL(publicReadACL);
var User = Parse.Object.extend("User");
var query = new Parse.Query(User);
query.equalTo("username", request.params.username);
query.find({
success: function(user) {
user.set("totalScore", request.params.totalS);
user.set("totalPredictions", request.params.totalG);
user.save()
},
error: function() {
response.error("f");
}
});
});
Any help would be massively appreciated.

Hopefully you've figured this out by now, but if you haven't...I would first say check to make sure that you're passing the "totalScore" and "totalPredictions" as numbers. If you pass them as strings and Parse is expecting a Number, it won't update. And generally, I believe it's best practice to query the user class as follows:
var query = new Parse.Query(Parse.User);
query.get(user.objectId, {
success: function(userAgain) {
userAgain.set("totalScore", totalScore);
userAgain.save(null, {
error: function(userAgain, error) {
// This will error, since the Parse.User is not authenticated
}
});
}
});
Then of course you'd still need to include the master key stuff etc...

Inserting multiple values in Mysql using Nodejs and notifying user with a response

I am making a new webservice where i send a curl command with JSON and the JSON contains a array as
[{tempid:1,email:abc#123,address:asd},{tempid:2,email:abc#12345,address:asd45},{tempid:3,email:abc#1234,address:asd4}]
Now when i pass and insert the array in a mysql table tempid is just to show a mapping to the user to the contact id generated in the database as tempid:1 is now inserted and in database it has cid 120 , like this for tempid2 and 3 ,
But when i am trying to show the client the updated values it shows only one value , last last change not the whole updated Array. Its becuase of the async nature of the connection.querry function , so i need help in this , here is my webservice
contactadd webservice -->
for(var i=0;i<=request.body.contact.length-1;i++)
{
if(request.body.contact[i].tempid)
{ var ardata=new Array();
var o=request.body.contact[i];
pair=Object.keys(o).map(function(a){ return [a, o[a]] });
AM.addcontact(pair,request.session.user,request.body.contact.length,function(e,o){
if(!o)
{
response.send('something went wrong'+e);
}
else
{
//response.send(o);
}
});
}
}
Here is the update function in the database.js script -->
//ContactSync-addcontact module for database
exports.addcontact=function (arr,email,addnum,callback)
{
var counter=0;
var uid;
var data=new Array();
var showinsert=new Array();
var values=new Array();
var datatable=new Array();
var inserting=new Array();
var tempid=0;
connection.query('SELECT UID FROM user where email1="'+email.email+'"',function(err,rows,fields){
if(err)
{
throw err;
}
else
{
if(rows[0]!=undefined)
{
uid=rows[0]['UID'];
}
else
{
uid="no id in database";
}
}
});// get the UID of the inserting user
// make array of user provided data
for(var j=0;j<=arr.length-1;j++)
{
if(arr[j][0]!='tempid')
{
data.push(arr[j][0]);
}
else
{
tempid=arr[j][1];
}
}
connection.query('SELECT column_name FROM information_schema.columns where table_schema="webservice" AND table_name="usercontacts"',function(err,rows,fields){
if(err)
{
throw err;
}
else
{
for(var i=0;i<=rows.length-1;i++)
{
datatable.push(rows[i]['column_name']);
}
}
for(var k=0;k<=datatable.length-1;k++)
{
if(inArray(data[k],datatable))
{
inserting.push(data[k]);
}
}
if(inserting.length>0)
{
for(var z=0;z<=arr.length-1;z++)
{
if(inArray(arr[z][0],inserting))
{
values.push('"'+arr[z][1]+'"');
}
}
// Insert tempid values and data in the usercontacts table with inserting and values
connection.query('INSERT INTO usercontacts (cid,uid,'+inserting+') VALUES("","'+uid+'",'+values+')',function(err,rows,fields){
if(err)
{
throw err;
}
else
{
connection.query('SELECT * FROM usercontacts WHERE uid="'+uid+'" ORDER BY cid DESC LIMIT 0,'+addnum+'',function(err,rows,fields){
if(err)
{
throw err;
}
else
{ showinsert.push('temp-id: '+tempid+',cid:'+rows[0].cid+',uid:'+uid);
//for(var i=0;i<=inserting.length-1;i++)
forEach(inserting,function(row,index)
{
showinsert.push(inserting[index]+":"+values[index]);
counter+=1;
});
callback(null,showinsert);
}
});
}
});
//insertion finished
}
else
{
callback("Please Provide atleast one field to enter with tempid");
}
});
}
I just need to insert all the callback in a array which has been inserted and show user that array ,please help , completely stuck and then only i am trying StackOverflow.
Thank you for reading till the end BTW

I'm not sure what the specific problem is, but there are some problems with the code you've shared that will bite you sooner or later. One of these may be causing your problem.
Race conditions
If the query SELECT UID FROM user where email1= for any reason takes longer than the SELECT column_name FROM information_schema.columns just below it then you won't have a value for the variable uuid and your logic will fail. Remember that these calls are non-blocking, so you can't rely on one finishing before the other one unless they're nested or use another flow-control mechanism (As #Tracker points out, async is popular).
Catching edge cases
In the line below you're assigning a string value to the uid variable and then continuing to use that variable even though it now contains an error message.
uid="no id in database";
Doing that means that your code later on will have trouble reacting. Instead use a different variable, leave the uid = undefined or immediately return the callback with an error, e.g.
return callback(new Error("user not found"));
Reporting errors
Don't throw errors in Node unless you want to kill the process, e.g. dependency problems during server startup. It doesn't work like Java, async errors are not caught by try/catch and will kill your process or leave you in a state that's hard to reason about. Instead make the error object your first parameter to the callback and return it immediately, like this:
if ( err ) return callback(err);
Then in your client code you can always check the first parameter to see if there was a problem.
Security problem
As #Tracker mentioned, don't ever do the this:
connection.query('SELECT UID FROM user where email1="'+email.email+'"', ...
If the value of the variable is passed through as "; drop table user; or similar then you're in trouble. Instead you can use node-mysql's build in escaping like this:
connection.query('SELECT UID FROM user where email1=?', [email.email], ...
Whitelist
You're querying information_schema.columns in order to detect which fields are valid then inserting them into usercontacts. This is a clever trick, but increases a 3 query process to 4 queries, and raises questions if there are any fields that a user shouldn't be inserting data into. Using a column whitelist may seem like more code to maintain, but would actually be simpler than all the code required to match columns dynamically.
Arrays
I don't see the source for the function inArray() but it looks like it does the same as Array.prototype.indexOf() so it may be better to use that. e.g.
if ( datatable.indexOf(data[k]) > -1 ) inserting.push(data[k]);
Every line of custom code you can delete is a line of code you don't have to maintain.

Populate Ember.Select directly from Database

Let me explain my issue, I am trying to populate Ember.Select directly from database.
I have these routes:
this.resource('twod', function() {
this.resource('twoduser', {
path : ':user_id'
});
});
In twoduser, I am displaying a full information about a single user. In that view, I have a Select Box as well, which end user will select and then with a button, he can add the user to a team that he selected from Ember.Select.
I tried to do this,
App.TwoduserController = Ember.ArrayController.extend({
selectedTeam : null,
team : function (){
var teams = [];
$.ajax({
type : "GET",
url : "http://pioneerdev.us/users/getTeamNames",
data : data,
success : function (data){
for (var i = 0; i < data.length; i ++){
var teamNames = data[i];
teams.push(teamNames);
}
}
});
return teams;
}.property()
})
Then in my index.html:
{{view Ember.Select
contentBinding="team"
optionValuePath="teams.team_name"
optionLabelPath="teams.team_name"
selectionBinding="selectedTeam"
prompt="Please Select a Team"}}
But when I do this, for some reason it interferes with Twoduser and I am not able to view the single user.
Furthermore, here's a sample JSON response I will get through the url:
{"teams":[{"team_name":"Toronto Maple Leafs"},{"team_name":"Vancouver Canuck"}]}
Moreover, I am fetching all users using Ajax like this:
App.Twod.reopenClass({
findAll : function() {
return new Ember.RSVP.Promise(function(resolve, reject) {
$.getJSON("http://pioneerdev.us/users/index", function(data) {
var result = data.users.map(function(row) {
return App.Twod.create(row);
});
resolve(result);
}).fail(reject);
});
},
findBy : function(user_id) {
return new Ember.RSVP.Promise(function(resolve, reject) {
var user = App.Twod.create();
$.getJSON("http://pioneerdev.us/users/byId/" + user_id, function(data) {
var result = user.setProperties(data.user);
resolve(result);
}).fail(reject);
});
}
});
Though there's one thing, I have a separate Teams route:
this.resource('teamview', function(){
this.resource('teamviewdetail', {
path : ':team_id'
});
});
Which shows all the teams and a single team when you click on a single team.
Can I use that TeamviewController? or Can I fetch team names from Twoduser Controller and push names to the array as I mentioned before?
More Information:
If I use the way I mentioned, I get this error:
Uncaught TypeError: Object [object Object] has no method 'addArrayObserver'
Here's a working jsfiddle on the issue I am experiencing. You can select "Storyboard" from the Designation & then select the user. That will reproduce the issue.
One more Update: Seems using ObjectController instead of ArrayController issue solves the addArrayObserver issue. But still I can't get the teams in the Ember.Select.

The biggest issue here is that you use Array#push instead of pushObject. Ember needs the special methods in order to be aware of changes. Otherwise, it will continue to think that the array of teams is as empty as when you first returned it. Second biggest issue is that your ajax success call isn't accessing the returned data properly.
Also, optionValuePath and optionLabelPath are relative to the individual select option view, so they should start with content, which is the individual item as set on the view. So: content.team_name