How to protect object variables when rollbacking ? [SOLVED]

[Dawn]

Rollback on my novel worked fine when I was using global variables. But I'd rather use some object. And now I encountered some difficulties when player is rollbacking...

Here is my new code:

Code: Select all

init python :
    inventory = Inventory()
label start:
    e "You have %(inventory.money)s $"  #You have 50$
    $ inventory.earn(5)
   e "You earn 5 $"
   e "You have %(inventory.money)s $"  #You have 55$

It works fine. But if players use the rollback feature, he earn 5$ for each rollback...

So his money is growing 55, 60, 65, 70$, etc.

When I was using global variables, I didn't have this kind of problem.

Here is the inventory class source code:

Code: Select all

    class Inventory(store.object):
    ##############################
        def __init__(self, money = 50):
            self.money = money
            self.items = []
            
        ## Player earn money
        def earn(self, money): # Player earn money
            self.money += money

What have I to code to remove money when rollbacking?

PS : I read this topic, so I tried to add the below code, but it changed nothing:

Code: Select all

    import renpy.store as store
    import renpy.exports as renpy # we need this so Ren'Py properly handles rollback with classes

[Dawn]

After a full rebuild, I found the solution!
inventory have to be declared after the "label start" and not in a "init python"

Code: Select all

label start:
    $ inventory = Inventory()
    e "You have %(inventory.money)s $"  #You have 50$
    $ inventory.earn(5)
    e "You earn 5 $"
    e "You have %(inventory.money)s $"  #You have 55$

[trooper6]

Actually, current best practices, especially for saving and rollback is to declare the objects outside of an init block, before the start label, using default. (Also, you should use renpy interpolation).

So:

Code: Select all

default inventory = Inventory()

label start:
    e "You have [intentory.money]$"  #You have 50$
    $ inventory.earn(5)
    e "You earn 5 $"
    e ""You have [intentory.money]$"  #You have 55$

[Dawn]

Thank you very much! With interpolation you saved me a lot of time. Without your help, I will have problem with translation! Thanks for these two tips!

edit : I do a mistake. I tried your solution with define (instead of default). It doesn't work ! When I rollback money is not removed from inventory instance. But it works with default !