'self' argument not passed to GDScript automatically

[Alikae]

Hi @gilzoide.

Firstly, I would like to thank you for your work.

While trying to call a GDScript method from a Lua script, the owner of the method is not passed as first argument and need to be given manually.

Sample Code:

Test.gd:

extends Node

func _ready(): var lua_script = load("res://LuaTest.lua") lua_script.ltest(self)

func test(): print('It worked !')`

LuaTest.lua:

`local LuaTest = { extends = "Node", }

function LuaTest:ltest(parent) parent.test() -- The code work if we pass parent as argument here end

return LuaTest`

Corresponding error: E 0:00:00.490 test: attempt to index local 'o' (a nil value)

Is there something I missed on how it's supposed to work ? Thanks by advance,

[bojjenclon]

Hi, it looks like you may be calling the method incorrectly. I see you're using dot notation - e.g. parent.test() in your Lua file. For Lua "objects" you should actually use a colon, like so parent:test(). This will automatically pass in self.

In essence, parent.test would look for a class wide method whereas parent:test would look for an instance method

[Alikae]

Thanks. Look like I need to dive a little more in Lua. :pray:

[gilzoide]

Yeah, Lua is a little bit different than most programming languages. The next thing I want/need to do is a document like "From GDScript to Lua" showing these differences. Sorry that it isn't in place yet.

---

Not related, but if want, you can make highlighted code blocks with triple backticks and the language name.

For example, writing:

```gdscript
extends Node

func _ready():
    var lua_script = load("res://LuaTest.lua")
    lua_script.ltest(self)

func test():
    print('It worked !')`

shows like
```gdscript
extends Node

func _ready():
    var lua_script = load("res://LuaTest.lua")
    lua_script.ltest(self)

func test():
    print('It worked !')`