I have a disc which i want to generate in igloo chest. I tried to do it via LootModifier. There are some code i used, but it doesn't work:

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public class DiscUAAdditionModifier extends LootModifier {
    private final Item addition;

    protected DiscUAAdditionModifier(LootItemCondition[] conditionsIn, Item addition) {
        super(conditionsIn);
        this.addition = addition;
    }

    @Nonnull
    @Override
    protected List<ItemStack> doApply(List<ItemStack> generatedLoot, LootContext context) {
        generatedLoot.add(new ItemStack(addition, 1));
        return generatedLoot;
    }

    public static class Serializer extends GlobalLootModifierSerializer<DiscUAAdditionModifier> {

        @Override
        public DiscUAAdditionModifier read(ResourceLocation name, JsonObject object,
                                                      LootItemCondition[] conditionsIn) {
            Item addition = ForgeRegistries.ITEMS.getValue(
                    new ResourceLocation(GsonHelper.getAsString(object, "addition")));
            return new DiscUAAdditionModifier(conditionsIn, addition);
        }

        @Override
        public JsonObject write(DiscUAAdditionModifier instance) {
            JsonObject json = makeConditions(instance.conditions);
            json.addProperty("addition", ForgeRegistries.ITEMS.getKey(instance.addition).toString());
            return json;
        }
    }
}

 

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@Mod.EventBusSubscriber(modid = SCIMod.MODID, bus = Mod.EventBusSubscriber.Bus.MOD)
public class ModEventBusEvents {

    @SubscribeEvent
    public static void registerModifierSerializers(@Nonnull final RegistryEvent.Register<GlobalLootModifierSerializer<?>>
                                                           event) {
        event.getRegistry().registerAll(
                new DiscUAAdditionModifier.Serializer().setRegistryName
                        (new ResourceLocation(SCIMod.MODID,"disc_igloo"))
        );
    }
}

 

and the json file: 

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{
  "conditions": [
    {
      "condition": "forge:loot_table_id",
      "loot_table_id": "minecraft:chests/igloo_chest"
    }
  ],
  "addition": "sci:disc_mod",
  "type": "sci:disc_igloo"
}

 

 

Could you more clearly define didn't work? What does the debug.log say? Did you follow all the steps in the docs?