Is there a way to detect when an item is being used in a loot table? I have a custom bush that I would like to drop itself when shears are used on it, and drop seeds otherwise. However, I am not sure how to implement that into a JSON lootable (if at all possible), and the documentation has nothing on this. Do I need to find out if the block is being broken with shears in the class, and then change the JSON loot table? How would I even go about doing that?

 

My Custom Bush:

Spoiler

public class WildCrop extends BushBlock {
	   protected static final VoxelShape SHAPE = Block.makeCuboidShape(2.0D, 0.0D, 2.0D, 14.0D, 13.0D, 14.0D);

	   public WildCrop(Block.Properties properties) {
	      super(properties);
	   }

	   public VoxelShape getShape(BlockState state, IBlockReader worldIn, BlockPos pos, ISelectionContext context) {
	      return SHAPE;
	   }

	   public Block.OffsetType getOffsetType() {
	      return Block.OffsetType.XZ;
	   }
	   
	   public static void generateBush(IWorld world, BlockPos pos, Random random) {
			   world.setBlockState(pos, BlockRegistry.Registry.WILD_CROP.getDefaultState(), 3);
	   }
}

 

My Bush's JSON loot table:

Spoiler

{
	"type": "minecraft:block",
	"pools":[
		{
			"rolls": 1.0,
			"name": "wild_crop_tomato_drop",
			"entries": [
				{
	            	"type": "minecraft:item",
	            	"name": "mmyronswickedadditions:tomato_seeds",
					"weight": 1
	          	},
				{
	            	"type": "minecraft:item",
	            	"name": "minecraft:wheat_seeds",
					"weight": 1
	          	},
				{
					"type": "empty",
					"weight": 2
				}
			]
		}
	],
	"functions": [
    	{
      		"function": "minecraft:explosion_decay"
    	}
  	]
}

 

29 minutes ago, mmyron said:

How would I even go about doing that?

Check out any of the leaves loot table jsons. It will show you how.

The broad strokes response is that its a Loot Condition. One already exists for shears, but it is possible to write your own, too.