player metaTable errors

[connorclockwise]

Alright, so I tried to add more functions to the metaTable "player", so I could start on an inventory of sorts. However, whenever I try to call the method on an entity, as a use function, it returns an error.
Ent code:
[lua]function ENT:Use( activator, caller)

Msg("it's alive! :O")
Msg(self.Entity.class)
activator:giveItem( activator, self.Entity.class )

end[/lua]

MetaTable code:
[lua]local meta = FindMetaTable("player")

function meta:takeItem( ply, class)
self.inventory[class] =- 1
Msg("You've just lost"..class)
end

function meta:giveItem( ply, class)
self.inventory[class] =+ 1
Msg("You've just recieved"..class)
end

function meta:inventoryToString( ply )
local parse = ""
for k, v in pairs ( self.inventory ) do
parse = parse.."+"..k.."="..v
end
return parse
end[/lua]

Exact error is "entities/item/init.lua:25: attempt to call method 'giveItem' (a nil value)"

[CombineGuru]

it's "Player" not "player"

[editline]03:58PM[/editline]

what's the ply for?

[CowThing]

It needs to be
FindMetaTable("[b]Player[/b]")
I think. Because 'Player' is the object and 'player' is a library.

[B]EDIT:[/B]
ninja'd

[connorclockwise]

Thanks very much magical talking trashcans.

[editline]03:06PM[/editline]

Sorry, I'm still getting the same error.

[editline]03:10PM[/editline]

Still broked. Same error.

[MegaJohnny]

Are you absolutely sure the metatable code is being run? What's it being called from - the entity script? Autorun/server? Something else? Did you check the console for any errors relating to the metatable script itself?

[commander204]

Why are you passing the player trough the argument when you are using self?

[CombineGuru]

Do it like this:

[lua]
function _R.Player.takeItem( ply, class )
ply.inventory[ class ] = ply.inventory[ class ] - 1
ply:ChatPrint("You've just lost " .. class )
end
[/lua]

[connorclockwise]

I see now that the ply arguement was extra, but I'm positive the metatable is being run, I'm running it through a gamemode.

@combineguru - explanation plox.

I'll look for a metatable related error.

[Lexic]

There is no such lua operation =+. Because of this, your metatable code isn't being run and therefore you are not adding the functions.

[Entoros]

I can also see potential errors in that you never defined self.inventory as a table.

[connorclockwise]

How would I go about defining a table within a meta table?

And yes Lexi, that's been changed since then. :|

[Entoros]

Just say

self.inventory = self.inventory or {}

In Lua, a "nil" value is considered "false" in an or statement. So that statement will evaluate is the same as

if self.inventory != nil then
      self.inventory = self.inventory
else
      self.inventory = {}
end

That way if the inventory is nil, then you get an empty table.

[connorclockwise]

Oh, I guess I'll try that. Thank you very much.