Hi Antoine,

What you could do here is set the "userName" and "displayName" to be the exact same. As the userName has to be unique on Registration, the RegistrationResponse will return an error saying "USERNAME": "TAKEN" if it is already in use, this will ensure that both your userName and displayNames are all unique without you having to add any extra code. Do you plan on using the players email addresses for anything in game ? It would be possible to store it in a players scriptData on Registration, I can show you how to do this if you'd like. If you have any more questions just let me know.

Thanks,

Liam

Hi Antoine, 

You could check for unique displayNames manually in the RegistrationRequest and Response if you'd like. To do it you would require a custom runtime collection, for the purposes of this example I've just called it "displayNames"

So in your RegistrationRequest Cloud Code add the following.

//load the displayNames collection
var displayNameCol = Spark.runtimeCollection("displayNames")

//get the displayName passed in from the request
var displayName = Spark.getData().displayName;

//check the custom collection to see if the current displayName is already in use
var displayNameCheck = displayNameCol.findOne({"_id":displayName})

//if it's not the collection, proceed as normal
if(displayNameCheck === null){
    Spark.setScriptData("Success", displayName + " is Unique")
}

//if the displayName is already in our collection, throw an error to stop the request
else{
    throw "This displayName Is Not Unique"
}

Next in the RegistrationResponse Cloud Code you could add the follwoing.

//load our collection
var displayNameCol = Spark.runtimeCollection("displayNames")

//get the displayName 
var displayName = Spark.getPlayer().getDisplayName(); 

//insert the Unique displayName into our custom collection
var success = displayNameCol.insert({"_id" : displayName})

//response scriptata success message
Spark.setScriptData("Success", displayName + " was added to the displayNames collection")

That should do it, each Registration with a unique displayName will be successful and the custom collection will look like this. 

Hope this helps. If you have any other questions just let me know.

Thanks,

Liam

Hi Nguyen,

To achieve the same behaviour using the Game Data Service you could do the following:

//RegistrationRequest

var existingItem = Spark.getGameDataService().getItem("displayNames", Spark.getData().displayName);

if(existingItem.document()){

    Spark.setScriptError("error", "Display name taken");

    Spark.exit();

}

//Registration Response

var data = Spark.getData();

if(data.error) Spark.exit();

var item = Spark.getGameDataService().createItem("displayNames", Spark.getData().displayName);

item.persistor.persist();

Regards,

Vinnie