[Benalish]

This is the first time I try to apply OOP in Lua. My goal is to create a template as if it were an object, without using the mixin.

XML code:

<Frame name="TemplateListViewTemplate" virtual="true">		
	<Scripts>
		<OnLoad>
			self = LibUnitScanListView:New(self)
		</OnLoad>
	</Scripts>
</Frame>

Lua code:

LibListView = {}
 
function LibListView:New(self)
        
        local listviewmt = {
            buttons  = {}, 
            data = {},
            --more methods and functions
            SetWidgetScript = function(words) print(words) end,
        }
        setmetatable(self, { __index = setmetatable(listviewmt, getmetatable(self)) })
end

If I write

self = LibListView:New(self)

inside <OnLoasd> tag the code works fine. At this point, I would like to make sure that the class is created without passing self as a parameter: in short, using the wording

listview = LibListView:New()

to make the code more elegant.
I tried to not put self in the signature, just leaving it without any params:

function LibListView:New()

At this point an error emerges:

listview = CreateFrame("Frame","listview",UIParent,"TemplateListViewTemplate")
listview:SetSize(150, 100)
listview:SetPoint("TOPLEFT",50,-75)
listview:SetWidgetScript("Hello World")

returns this error:

attempt to call method 'SetWidgetScript' (a nil value)

Can you help me?