How to make a Ranking system for your army game?

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#1

Hello Developers, i’m currently building on a project(“the army of robloxia”) and i can’t make a ranking system like, if you pass a training you would be ranked by a instructor but it doesn’t work for me. Do you guys know how to make one?

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#2

Hello!
You will have to do this via group ranking system, (if some one passes, you rank them in the group and it matches that rank with a overhead GUI.)
But in order to do that you would need.

game.Players.PlayerAdded:Connect(function(newPlayer)
   if newPlayer:IsInGroup(GroupId) and Player:GetRankInGroup(GroupId) == 120 then then                    
      print ("Player is in group and ranked")
   end
end)

There are some Tutorials on this subject already however.
Links :
https://developer.roblox.com/en-us/api-reference/function/Player/GetRankInGroup
https://developer.roblox.com/en-us/api-reference/function/Player/IsInGroup

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#3

Adding to what you’ve said,

I’d suggest adding a pcall to GetRankInGroup, simply because it’s a web signal, and can fail sometimes due to updates on the web,etc.

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#4

You can use datastore to save the players ranks and grant access to instructors to rank people. Try this:

local Players = game:GetService("Players")
local DataStoreService = game:GetService("DataStoreService")

local DataStore = DataStoreService:GetDataStore("Data")

local Default = {
    Rank = {
        Type = "StringValue", -- The ClassName of the value that will be created
        Value = "" -- Rank that the player gets when he joins for the first time
    }
}

local Ranks = {
    "Rank1",
    "Rank2",
    "Rank3",
    "Rank4"
}

local Instructors = {
    "Rank3",
    "Rank4"
}

local Prefix = "." -- Change if you want to

local function CreateValue(Player, Name)
    local Data = DataStore:GetAsync(Player.UserId)[Name] or Default[Name]

    for _, Value in pairs(Data) do
        local NewValue = Instance.new(Value.Type)
        NewValue.Name = Name
        NewValue.Value = Value.Value
        NewValue.Parent = Player.Infos
    end
end

Players.PlayerAdded:Connect(function(Player)
    local Infos = Instance.new("Folder")
    Infos.Name = "Infos"
    Infos.Parent = Player

    for Name, Value in pairs(Default) do
        CreateValue(Player, Name)
    end

    Player.Chatted:Connect(function(Message)
        local Msg = string.split(Message,  " ")
        if Msg[1] == Prefix.."rank" and Players:FindFirstChild(Msg[2]) and table.find(Ranks, Msg[3]) and table.find(Instructors, Player.Infos.Rank.Value) then
            local Plr = Players:FindFirstChild(Msg[2])
            Plr.Infos.Rank.Value = Ranks[table.find(Ranks, Plr.Infos.Rank.Value) + 1]
            print("Old rank: "..Ranks[table.find(Ranks, Plr.Infos.Rank.Value) - 1].." | New rank: "..Plr.Infos.Rank.Value)
        end
    end)
end)

Players.PlayerRemoving:Connect(function(Player)
    local Data = {}

    for _, Values in pairs(Player.Infos:GetChildren()) do
        Data[Values.Name] = {}
        Data[Values.Name].Type = Values.ClassName
        Data[Values.Name].Value = Values.Value
    end

    DataStore:SetAsync(Player.UserId, Data)
end
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