Help: Updating one dictionary value changes value for same key in all other dictionaries

Godot Version

v4.2.stable

Question

I am losing my mind over a dictionary saving issue, which I rebuilt here very simplified:


Code example:

#initiate two different empty dictionaries
var save_data: Dictionary = {}
var game_data: Dictionary = {}

func _ready():
#inst. some game data
game_data = {“SomeText”: “Stone”}

#save current game data
save_data = game_data

#change a variable in game data to simulate game running
game_data[“SomeText”] = “Lava”

#print compare values
print(game_data[“SomeText”])
print(save_data[“SomeText”])


Returns:
“Lava”
“Lava”


I absolutely do not understand why the “SomeText” filed in “save_game” also gets changed and would have expected to receive “Lava” “Stone” as outcomes.

I am trying to use this to temporally save a bunch of current game data in “save_game” have to game continuing in “game_data” and be able to jump back to the old data in “save_game”. However, in this example both dictionaries are always 100% the same and do not have any added value

Any hint to what I am missing is highly appreciated!

Best and 1000 thanks
Jokster

This line doesn’t actually save anything, only makes both variables point to the same dictionary object. Try to use duplicate() instead.

2 Likes

You are my absolute hero. The following fixes the logic and works as a charm:

save_data = game_data.duplicate(true)

1 Like

This topic was automatically closed 30 days after the last reply. New replies are no longer allowed.