Use different way to handle connect_to_raillike numbers

game_api.txt

@@ -163,17 +163,18 @@ The following nodes use the group `connect_to_raillike` and will only connect to
 raillike nodes within this group and the same group value:
 
 | Node type		| Group value
-+-----------------------+------------
-| default:rail		| 2
++-----------------------+----------------------------------
+| default:rail		| default.connect_to_raillike.rails
 
 This is an overview of currently used groups:
-| Group value	| Description
-+---------------+------------
-| 2		| Rails
+| Group value				| Description
++---------------------------------------+------------
+| default.connect_to_raillike.rails	| Rails
 
 Example:
 If you want to add a new rail type and want it to connect with default:rail,
-add `connect_to_raillike=2` into the `groups` table of your node.
+add `connect_to_raillike=default.connect_to_raillike.rails` into the `groups` table
+of your node.
 
 
 Default sounds

mods/default/init.lua

@@ -13,6 +13,10 @@ default.gui_bg = "bgcolor[#080808BB;true]"
 default.gui_bg_img = "background[5,5;1,1;gui_formbg.png;true]"
 default.gui_slots = "listcolors[#00000069;#5A5A5A;#141318;#30434C;#FFF]"
 
+-- connect_to_raillike group values
+default.connect_to_raillike = {}
+default.connect_to_raillike.rails = 2
+
 function default.get_hotbar_bg(x,y)
 	local out = ""
 	for i=0,7,1 do

mods/default/nodes.lua

@@ -1433,7 +1433,7 @@ minetest.register_node("default:rail", {
                 -- but how to specify the dimensions for curved and sideways rails?
                 fixed = {-1/2, -1/2, -1/2, 1/2, -1/2+1/16, 1/2},
 	},
-	groups = {bendy=2,dig_immediate=2,attached_node=1,connect_to_raillike=2},
+	groups = {bendy=2,dig_immediate=2,attached_node=1,connect_to_raillike=default.connect_to_raillike.rails},
 })