Why Parse server is creating new object instead of updating? - parse-platform

Question

I am running parse server in NodeJS environment with express.
Generally, Parse automatically figures out which data has changed so only “dirty” fields will be sent to the Parse Cloud. So, I don’t need to worry about squashing data that I didn’t intend to update.
But why this following code is saving new data every time instead of updating the existing document data with name "Some Name".
// Parse code
Parse.initialize(keys.parseAppID);
Parse.serverURL = keys.parseServerURL;
var GameScore = Parse.Object.extend("GameScore");
var gameScore = new GameScore();
let data = {
playerName: "Some Name",
score: 2918,
cheatMode: true
};
gameScore.save(data, {
success: (gameScore) => {
// let q = new Parse.Query("GameScore");
// q.get(gameScore.id)
console.log("ID: " + gameScore.id)
},
error: function (gameScore, error) {
// Execute any logic that should take place if the save fails.
// error is a Parse.Error with an error code and message.
alert('Failed to create new object, with error code: ' + error.message);
}
});
// End of Parse code

Answer 1

The problem is that you're executing the query to find which object you want to update, but then you're not using the results when you go to save data.
query.first({ // This will result in just one object returned
success: (result) => {
// Check to make sure a result exists
if (result) {
result.save(data, {
// Rest of code
Note: You're treating playerName as a unique key. If multiple users can have the same playerName attribute, then there will be bugs. You can use id instead which is guaranteed to be unique. If you use id instead, you can utilize Parse.Query.get
Edit:
Since you want to update an existing object, you must specify its id.
var GameScore = Parse.Object.extend("GameScore");
var gameScore = new GameScore();
gameScore.id = "ID"; // This id should be the id of the object you want to update