DataStore2 problem: Attempt to perform arithmetic (add) on table and number

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#1

Hi. So recently, I’ve just started using DataStore2.

I’m using it for an inventory system. Problem: Whenever the item is purchased, I keep getting this error:

11:20:33.428 ServerScriptService.Leaderstats.DataStore2:191: attempt to perform arithmetic (add) on table and number - Server - DataStore2:191

Again, I’m new to using DataStore2 so any suggestions to resolve this issue are appreciated.

Server Script:

local dataStore2 = require(script.DataStore2)

local repStorage = game.ReplicatedStorage
local remotes = repStorage:WaitForChild("DataRemotes")
local buyItem = remotes:WaitForChild("Purchase")
local sendData = remotes:WaitForChild("SendData")

dataStore2.Combine("Key", "Money", "Inventory", "EquippedWeapons")

local starterMoney = 0
local defaultWeapons = {}
local equipped = ""

game.Players.PlayerAdded:Connect(function(player)
	
	local char = player.Character or player.CharacterAdded:Wait()
	
	local money = Instance.new("IntValue")
	money.Name = "Money"
	money.Parent = player
	money.Value = 0
	
	local inventory = Instance.new("Folder")
	inventory.Name = "Inventory"
	inventory.Parent = player
	
	local equippedWeapon = Instance.new("StringValue")
	equippedWeapon.Name = "Primary"
	equippedWeapon.Parent = player
	equippedWeapon.Value =  ""
	
	local moneyDataStore = dataStore2("Money", player)
	local inventoryDataStore = dataStore2("Inventory", player)
	local equippedDataStore = dataStore2("EquippedWeapons", player)
	
	local function updateMoney(value)
		money.Value = value
	end
	
	local function updatePlayerInventory(tableToAdd)	
		for i, v in pairs(inventory:GetChildren()) do
			v:Destroy()
		end	
		
		for i, v in pairs(tableToAdd) do
			local item = Instance.new("BoolValue")
			item.Name = v
		end
	end
	
	local function updateEquippedWeapon(weapon)
		equippedWeapon.Value = weapon
	end
	
	updateMoney(moneyDataStore:Get(starterMoney))
	updatePlayerInventory(inventoryDataStore:Get(defaultWeapons))
	updateEquippedWeapon(equippedDataStore:Get(equipped))
	
	moneyDataStore:OnUpdate(updateMoney)
	inventoryDataStore:OnUpdate(updatePlayerInventory)
	equippedDataStore:OnUpdate(updateEquippedWeapon)
	
	sendData:FireClient(player)
	
end)

buyItem.OnServerInvoke = function(player, weaponName)
	
	local moneyDataStore = dataStore2("Money", player)
	local inventoryDataStore = dataStore2("Inventory", player)
	local equippedDataStore = dataStore2("EquippedWeapons", player)
	
	local weapon, isOwned
	
	local newTable = {}
	
	weapon = repStorage.WeaponModels:WaitForChild(weaponName)
	
	if player.Inventory:FindFirstChild(weaponName) then isOwned = true end
	
	local cost = weapon:GetAttribute("Cost")
	
	if not isOwned then
		if player.Money.Value >= cost then
			moneyDataStore:Increment(-cost)
			
			local item = Instance.new("BoolValue")
			item.Name = weapon.Name
			
			for _, v in pairs(player.Inventory:Getchildren()) do
				table.insert(newTable, v.Name)
			end
			
			inventoryDataStore:Set(newTable)
		end
	end
	
	print("Done!")
	
end
1 Like
#2

Can you point to the line that is causing the error?

#3

This line, moneyDataStore:Increment(-cost), is where the error comes from.

#5

Assuming that this is the line giving you that error, it would have to be the attribute after reading the DataStore2 API, You seem to be using :Increment(-value) correctly, I would check what the attributed value is printing out, possibly the issue, or you are looking at the wrong line.

1 Like
#6

Ah I see. Also…

…yes, I can confirm that the error is coming from that line; I set the attribute as a number value and when I printed moneyDataStore:Get(), it was actually a table so I figured that’s where the problem was coming from.