How update only one element in nakama storage with Godot GDScript? It is possible?

Game Design
,
1

Hello guys, I hope you can help me. I am trying to migrate my logic to change my backend in php and mysql (WebService) to nakama. I have my project with Godot in GDScript. But I’m testing to see if all the logic I have would work for me, in nakama. And I find a problem. I put you in situation. My game the user has, several creatures, with which he will fight against other users. The user acquires these creatures. I want to store those creatures in the DB(Cockroach). I am using docker and nakama. So, I add these creatures with this function…

func write_creature_async(creatures := []) -> void:
yield(Online.nakama_client.write_storage_objects_async(
		Online.nakama_session,
		[
			NakamaWriteStorageObject.new(
				"all_creatures",
				"creaturesUser",
				ReadPermissions.OWNER_READ,
				WritePermissions.OWNER_WRITE,
				JSON.print({creatures = creatures}),
				""
			)
		]
	), "completed")

And creatures is this:

func _on_Button_button_down():
	var creatures := [
		{id = 0, creatureName = "Floosty", level = 2, experience = 0, max_exp = 25, max_hp = 30, atack1 = "Placaje"},
		{id = 0, creatureName = "Floosty", level = 3, experience = 0, max_exp = 25, max_hp = 30, atack1 = "Placaje"},
	]
	
	yield(write_creature_async(creatures), "completed")

estos datos aparecen en nakama así:

{
  "creatures": [
    {
      "atack1": "Placaje",
      "creatureName": "Floosty",
      "experience": 0,
      "id": 0,
      "level": 2,
      "max_exp": 25,
      "max_hp": 30
    },
    {
      "atack1": "Placaje",
      "creatureName": "Floosty",
      "experience": 0,
      "id": 1,
      "level": 3,
      "max_exp": 25,
      "max_hp": 30
    }
  ]
}

The problem comes when I try, for example, to change a stat of a single creature. To begin with, I can’t find a way to add an autoincremental ID (I’ve created a function to get out of trouble). And then, I can’t find how I could run update the stats of a single creature. The only option I see is to do a get of all the creatures, add them to an array, search the array for the creature I want to modify, and then do a write_storage_objects_async again adding all the creatures again. It is possible that this cannot be done as it is normally done in a DB with an INSERT or an UPDATE or a DELETE of a creature by id. But it seems strange to me and I can’t find any other options. Thank you!

2

Hi @sergisnt welcome to the forum.

For creature ID I would suggest you generate a UUID rather than use an auto-incrementing integer.

As for updating a single creature’s stats, you might want to consider storing each creature that belongs to a player in a separate storage object.

For example, you could have a "Creatures" collection in Nakama Storage Engine and store each creature belonging to a player inside that collection, keyed by the creature’s UUID.

You can then use the storage engine’s List API to retrieve all creatures that belong to a user (Nakama: Godot | Heroic Labs Documentation).

Once you have the creatures, it is then easy enough to make a change to a single creature and update it using the Write API (Nakama: Godot | Heroic Labs Documentation).

I hope this helps.

3

Do you mean to add the creatures collection and in the Key parameter add the ID of the creature? and have something like this?

image
image1571×180 9.59 KB

On the other hand, there is an already defined way to generate that UUID. Any existing function? Or do I generate the function and manually add the id to the key parameter?

And thanks for your support :smiley:

PS: Do you have any network or way to have a faster chat? Discord or similar?

4

Yes that’s correct, where the Key Name is the ID of the creature. I would recommend using a UUIDv4 but any unique key will do. You may need to find a GDScript implementation of UUIDv4 as I don’t believe it’s part of GDScript as standard.

The forums are the best way to reach us with questions. :slight_smile: