1.19.2 - Looking to modify a mod's loot table

[Psistorm]

I'm running a small server for some friends, and we run Dragon Mounts Legacy as part of our small selection of mods. We wanted to up the drop rate for the dragon eggs, and thus - total noob as far as creating datapacks/etc goes - I am now trying to find a way to modify the drop rates.

The github for the loot_modifier part of the mod is here:
https://github.com/Kay9Unit/Dragon-Mounts-Legacy/tree/master/src/generated/resources/data/dragonmounts/loot_modifiers/dragonmounts

And my question basically is: loot_modifier is a forge specific thing, but can I possibly run a datapack to override these modifications with my own? Or what would be the most straightforward way for me to basically control the drop rates for the eggs myself?

[warjort]

Yes, they are designed to be used in datapacks.

But the global loot modifiers are a bit subtle. They are additive by default, like tags. So it will run both the mod's and your loot modifier.

If you don't want this, you need a data/forge/loot_modifiers/global_loot_modifiers.json and use the "replace" option  to stop the mod's loot modifier from being run.

That's not something I have ever done, so I don't have an example.

See: https://forge.gemwire.uk/wiki/Dynamic_Loot_Modification#The_global_loot_modifiers.json for more details.

[Psistorm]

Looks like the "replace" value was what I was missing, I'll test this out and will report back once I have results, thank you!

[Psistorm]

TO update, no dice, sadly. I switched replace to true, but it's not showing up. I found something odd though. I installed JER to verify the loot tables for the dragon eggs, but it's not working on those items. I made sure that the server-config to allow loot tables was enabled for the single player world I'm testing in as well. It almost seems like the mod itself is not spawning eggs at all for some reason, but I figure a loot modifier should still make that happen regardless?

[Warren Tode]

Okay, I have ZERO understanding how loot tables work via Forge. But, before I started modding, I had no trouble altering existing loot tables or adding new ones via datapacks alone - whether these loot tables were mine, from a mod, or vanilla. This link is a good starting point for that if you'd like to do it via a datapack alone: here. You can also go here to help you build a loot table as well. I'm sure there are probably other tutorials out there for this if you need to find them. I wish I had an answer for Forge specifically though. Maybe someone else does?

Edited March 23, 2023 by Warren Tode
Corrected spelling error

[Psistorm]

Thank you for the links, I used the first one to learn about loot tables before beginning, it was quite helpful actually, the second one should definitely come in handy if I do make my own from scratch, too!

To provide some more info, I'll put the global_loot_modifiers.json here, as well as list the file structure, just to make sure everything is correct.

{
  "replace": true,
  "entries": [
    "dragonmounts:dragonmounts/aether/chests/simple_dungeon",
    "dragonmounts:dragonmounts/ghost/chests/woodland_mansion",
    "dragonmounts:dragonmounts/water/chests/buried_treasure",
    "dragonmounts:dragonmounts/fire/chests/desert_pyramid",
    "dragonmounts:dragonmounts/forest/chests/jungle_temple",
    "dragonmounts:dragonmounts/ghost/chests/abandoned_mineshaft",
    "dragonmounts:dragonmounts/ice/chests/igloo_chest",
    "dragonmounts:dragonmounts/nether/chests/bastion_treasure"
  ]
}

 

file structure:

[datapack name] / data / forge / loot_modifiers / global_loot_modifiers.json

[datapack name] / data / dragonmounts / loot_modifiers / ghost / chests / abandoned_mineshaft.json

there are more folders in loot_modifiers for the other dungeon chests, all intended - as a test right now - to convey a 100% spawn chance for a dragon egg (usually it is around 7.5 to 30%). However testing with this I found no eggs anywhere, and like I said, JER does not show any drop information for dragon eggs, but does show drop information for other items, chests and mob drops both.

For completness sake, an excerpt of one of the loot table modifiers, this one for the mineshaft:

{
  "conditions": [
    {
      "condition": "forge:loot_table_id",
      "loot_table_id": "minecraft:chests/abandoned_mineshaft"
    },
    {
      "condition": "minecraft:random_chance",
      "chance": 1.0
    }
  ],
  "breed": "dragonmounts:ghost",
  "type": "dragonmounts:dragon_egg_loot"
}

I appreciate all the feedback here so far, by the way, thanks for everyone who replied!

[Warren Tode]

I'm pretty sure that if you're altering an existing loot table, you'll need to use the exact same namespaces and folder structure that loot table has in order to get the new loot in there.

[Psistorm]

Ahh - right now I'm copying the namespace of the mod, which uses loot modifiers to alter the vanilla table, I'll do some more research

[zzQuestionmark]

Hi I’m running same mod on a server and realized they are spawning in chests which I don’t want, if I were to edit this data pack to disable them spawning in chests how would I do that? Explain to me like I’m 8

[Psistorm]

I do know that the server-config.cfg in your world folder will have a loot table option, it /should/ default to false, but that would be the setting you want. Looks like we're having opposite issues, hah.