[1.12] Trigger advancement when the player picks up one of several items?

[Draco18s 2414]

How would I go about triggering an advancement when the player picks up one item in a list, not all of them?

 

The vanilla conditions seem to be an AND operator and I can't figure out how to specify an OR.

[jabelar 594]

I think the point of the optional "requirements" section of the advancement is to allow for OR operations. If you specify a bunch of item criteria without the requirements then it will be an AND. 

 

If you look at the information here: http://www.minecraftforum.net/forums/minecraft-discussion/redstone-discussion-and/commands-command-blocks-and/2809368-1-12-custom-advancements-aka-achievements#Requirements it specifically mentions that requirements are intended to allow boolean combinations of criteria. And an example earlier on that page shows where an advancement can be made if "either" (implying OR) criteria are met.

 

The key to changing the AND to an OR seems toi be the placement of the brackets in the requirements. 

Edited August 28, 2017 by jabelar

[Draco18s 2414]

Ah ha. Few (if any) of the vanilla advancements make use of such logic and their accompanying deserializers are hard to read. Especially when you don't know what to look for.

 

Thanks!