Fixed groups and black sign drop item

signs/common.lua

@@ -142,7 +142,7 @@ function signs.register_sign(mod, name, model)
 			wall_top = {-model.width/2, 0.5, -model.height/2,
 						   model.width/2, 0.5 - model.depth, model.height/2},
 		},
-		groups = {choppy=2,dig_immediate=2,attached_node=1},
+		groups = {choppy=2, dig_immediate=2, attached_node=1},
 		sounds = default.node_sound_defaults(),
 		display_entities = {
 			["signs:text"] = {
@@ -165,7 +165,13 @@ function signs.register_sign(mod, name, model)
 
 	-- Node fields override
 	for key, value in pairs(model.node_fields) do
-		fields[key] = value
+		if key == "groups" then
+			for key2, value2 in pairs(value) do
+				fields[key][key2] = value2
+			end
+		else
+			fields[key] = value
+		end
 	end
 
 	if not fields.wield_image then fields.wield_image = fields.inventory_image end

signs/nodes.lua

@@ -118,7 +118,7 @@ local models = {
 				wall_side = {-0.5, -7/32, -0.5, -7/16, 7/32, 7/16},
 				wall_bottom = {-0.5, -0.5, -0.5, 0.5, -7/16, 0.5},
 				wall_top = {-0.5, 0.5, -0.5, 0.5, 7/16, 0.5}},
-			groups={choppy=1,oddly_breakable_by_hand=1,not_in_creative_inventory=1},
+			groups={not_in_creative_inventory=1},
 			drop="signs:wooden_right",
 		},
 	},

signs_road/nodes.lua

@@ -64,7 +64,7 @@ local models = {
 			tiles={"signs_black_right.png"},
 			inventory_image="signs_black_inventory.png",
 			on_place=signs.on_place_direction,
-            on_rightclick=signs.on_right_click_direction,
+			on_rightclick=signs.on_right_click_direction,
 		},
 	},
 	black_left={
@@ -80,10 +80,10 @@ local models = {
 			description="Black direction sign",
 			tiles={"signs_black_left.png"},
 			inventory_image="signs_black_inventory.png",
-			groups={choppy=1,oddly_breakable_by_hand=1,not_in_creative_inventory=1},
-			drop="signs:black_right",
+			groups={not_in_creative_inventory=1},
+			drop="signs_road:black_right",
 			on_place=signs.on_place_direction,
-            on_rightclick=signs.on_right_click_direction,
+			on_rightclick=signs.on_right_click_direction,
 		},
 	},
 }