How do i replace items inside a chest

[mimi2023]

when a player put an item inside the chest it will replace it with another item

note replace items only in vanilla chest

 

[MFMods]

that would be difficult. and there is a ton of ways an item could end up in a chest - maybe i tossed it and a conveyor belt brought it to a chest and placed it in? or i threw it onto a hopper? no way you can detect all that.

 

what do you want, really?

perhaps you can react to ItemEntity creation and have your item be one thing while in inventories and another when spinning on the ground?
if it finds its way back into player's inventory, you can "feel" it there (things can tick in player's inventory) and do a switcharoo?