how do you save tables with data store?

so the script i made is supposed to save a table with items names, and when player joins it should find items from the table in purchasables model (which is a model that has all purchasable items), and put them into purchased model (where bought items are stored) but it surprisingly doesn't work. however im not getting any errors. Heres the script:

local datastore = game:GetService("DataStoreService")
local ds2 = datastore:GetDataStore("DS2")
local purchasables = game.ServerStorage.PURCHASABLES:GetChildren()
game.Players.PlayerAdded:Connect(function(plr)
    local success,err = pcall(function()
		for i,v in pairs(purchasables) do
			if v.Name == val then
				v.Parent = game.Workspace.PURCHASED
			end
		end
    end)
    if success then
        print("Your Items Have Been Loaded.")
    else
        print("Your Items Loading Has Failed.")
        warn(err)
    end
end)

game.Players.PlayerRemoving:Connect(function(plr)
	for i,v in pairs(game.Workspace.PURCHASED:GetChildren()) do
		tab,val = {},v.Name
		table.insert(tab,val)
	end
    local success,err = pcall(function()
		for i,v in pairs(purchasables) do
			ds2:SetAsync(plr.UserId,val)
        end
    end)
    if success then
        print("Your Items Have Been Saved.")
    else
        print("We Got An Error While Saving Your Items.")
        warn(err)
    end
end)

well the best thing to do is to save the table as JSON, you can make your own JSON parser, or you can use HTTP service function parsers

for instance:

local http= game:GetService("HTTPService")
local data = {name = "badcc", vehicles = {"lambo", "benz", "tesla"} };

local json = http:JSONEncode(data) --turns table to a json  object
local data2 = http:JSONDecode(json) -- turns the json object into a lua object, like "data"

remember, the JSON returned from http:JSONEncode is just a lua string, which means you can save it to datastore

when you call http:JSONEncode(data) it will retun something like this "{name = "badcc", vehicles=["lambo", "benz", "tesla"]}"

you can find out more about the HTTP service here

this is what i have done so far with the json

local datastore = game:GetService("DataStoreService")
local http = game:GetService("HttpService")
local ds2 = datastore:GetDataStore("DS2")
local purchasables = game.ServerStorage.PURCHASABLES:GetChildren()
game.Players.PlayerAdded:Connect(function(plr)
    local success,err = pcall(function()
		for i,v in pairs(purchasables) do
			data2 = http:JSONDecode(json)
			if v.Name == data2 then
				v.Parent = game.Workspace.PURCHASED
			end
		end
    end)
    if success then
        print("Your Items Have Been Loaded.")
    else
        print("Your Items Loading Has Failed.")
        warn(err)
    end
end)

game.Players.PlayerRemoving:Connect(function(plr)
	for i,v in pairs(game.Workspace.PURCHASED:GetChildren()) do
		data = {v.Name}
		json = http:JSONEncode(data)
	end
    local success,err = pcall(function()
		for i,v in pairs(purchasables) do
			ds2:SetAsync(plr.UserId,json)
        end
    end)
    if success then
        print("Your Items Have Been Saved.")
    else
        print("We Got An Error While Saving Your Items.")
        warn(err)
    end
end)

rip

--Try this

local dataStore = game:GetService("DataStoreService")
local DS = dataStore:GetDataStore("DS2")
local purchasables = game.ServerStorage:WaitForChild("PURCHASABLES"):GetChildren()
local purchased = workspace:WaitForChild("PURCHASED")
local purchasedTBL = purchased:GetChildren()

game.Players.PlayerAdded:Connect(function(plr)
	local gameData = DS:GetAsync(plr.UserId)
	
	for _,v in pairs(purchasables) do
		if gameData == nil then return end --New Player
		gameData[v].Parent = purchased
	end
end)

game.Players.PlayerRemoving:Connect(function(plr)
	local saveData = {}
	
	for _,v in pairs(purchased) do
		table.insert(saveData,v)
	end
	DS:SetAsync(plr.UserId, saveData)
end)

game:BindToClose(function() --Prevent Data Loss, if unexpected shutdown
	for _,v in pairs(game.Players:GetPlayers()) do
		v:Kick("Closing")
	end
	
	game:GetService("Players").PlayerAdded:Connect(function(plr)
		plr:Kick("Closing")
	end)
end)