Duplicate() not making a unique copy of my custom resource

[MummunMussukka]

Godot Version

4.2.1

Question

I am making a dungeon crawler where you have multiple party members. I have a party member scene and a custom resource for storing their inventory data. The party members have this code in their script

@export var inventory: Inventory

func _ready():
	inventory = inventory.duplicate()

The problem is, for some reason the resource stored in the inventory variable is still not unique. When I put stuff in one party member’s inventory, they all get it for some reason. When I make the inventory unique from the editor it works fine but I don’t want to do that manually every time so it would be really nice if there is a solution to this

[phazorknight]

Have you tried setting the Local To Scene setting on the resource to true?
That helped me a lot with related issues for my own custom resource.

[MummunMussukka]

Thanks for the reply, I just checked and it seems that the issue still persists if I do that

[shatteredreality]

Try duplicating with the subresources argument as true.

[MummunMussukka]

Sorry, forgot to mention it in the original post, tried that already and it didn’t have any effect

[dandeliondino]

You may be encountering this known issue with duplicating Resources then: Resource.duplicate(true) doesn't duplicate subresources stored in Array or Dictionary properties · Issue #74918 · godotengine/godot · GitHub

Your Inventory resource probably contains an array or dictionary that is not getting a unique instance.

The workaround is to create a custom duplicate function for your resource that will also make deep copies of all the arrays and dictionaries that it contains.

[MummunMussukka]

Thank you, that seems to explain this