Table Errors using OOP

Help and Feedback Scripting Support
#1

I’m trying to use OOP to create a grid system. Currently, there’s a problem with remembering a set of tiles that I don’t fully understand.

local Grid = {}
Grid.__index = Grid

function Grid.new(size)
   local self = setmetatable({}, Grid)
   self.Size = size
   self.Tiles = {}
   return self
end

function Grid:AddTile(object, position)
   local tile = Tile.new() -- an object with properties: Object, Position
   tile.Object = object
   tile.Position = position
   table.insert(self.Tiles, tile)
end

function Grid:GetTile(pos)
   local t
   for _, tile in pairs(self.Tiles) do
      if tile.Position == pos then
         t = tile
         break
      end
   end
   return t
end

My problem is that when I use AddTile, the Tiles are added only during that scope (ot whatever you call it). If I try to reference self.Tiles anywhere else (like GetTile), it outputs nil.

The specific error that pops up when I use GetTile is:

ServerScriptService.Grid:42: invalid
argument #1 to 'ipairs' (table expected, got nil)

Any help here would be appreciated.
(I’m going to sleep after I post this. I won’t be answering anything until a few hours later.)

1 Like
#2

You never returned self? That’s probably why it is returning nil.

#3

Whoops. It was a typo. Sorry about that.

#4

What did you reference self when getting the error using :GetTile() ?