How to implement UGC? (User Generated Content)

from my personal experience with roblox datastores, I believe using two data stores (one hosting the outfits, and another hosting the owners of the specific outfits) would work fine.

we save outfits inside an OutfitIDStore with a unique ID (generate a unique ID and save a table with all the IDs) and then append that same ID to a user's outfits list (get the user's table and append the outfit ID to it)

this code has NOT been tested

-- TODO: test code

local DataStoreService = game:GetService('DataStoreService')

local OutfitIDStore = DataStoreService:GetDataStore('OUTFIT_STORE')
local UserIDStore = DataStoreService:GetDataStore('USER_STORE')

local Chars = ('abcdefghijklmnopqrstuvwxyz0123456789').split('')
local GenericLength = 6

-- DATASTORE FUNCTIONS
local function GetOutfitIDStore(key)
    if key == nil then
        error(('missing argument key (got %s, expected not nil)').format(tostring(key)))
    end

    return pcall(function()
        OutfitIDStore:GetAsync(key)
    end)
end

local function SetOutfitIDStore(key, data)
    if key == nil then
        error(('missing argument key (got %s').format(tostring(key)))
    end

    if data == nil then
        error(('missing argument data (got %s)').format(tostring(key)))
    end

    return pcall(function()
        OutfitIDStore:SetAsync(key, data)
    end)
end

local function GetUserIDStore(key)
    if key == nil then
        error(('missing argument key (got %s, expected not nil)').format(tostring(key)))
    end

    return pcall(function()
        UserIDStore:GetAsync(key)
    end)
end

local function SetUserIDStore(key, data)
    if key == nil then
        error(('missing argument key (got %s').format(tostring(key)))
    end

    if data == nil then
        error(('missing argument data (got %s)').format(tostring(key)))
    end

    return pcall(function()
        UserIDStore:SetAsync(key, data)
    end)
end

local function GenerateUniqueID(length: int)
    if type(length) ~= 'number' then
        length = GenericLength
    end

    local ID = ''
    for i = 1, length do
        ID = ID + Chars[math.random(1, #Chars)]
    end

    local ok, data = GetOutfitIDStore(ID)
    if not ok and type(data) ~= 'table' then
        return ID
    else
        return GenerateUniqueID(length)
    end
end

-- OUTFIT FUNCTIONS
local function SaveOutfit(Accessories: table, UserID: int)
    assert(Accessories, 'no accessories provided.')
    assert(UserID, 'no userid provided.')

    -- upload outfit to database
    local ID = GenerateUniqueID()
    local UploadSuccess, Message = SetOutfitIDStore(ID, Accessories)
    if not UploadSuccess and Message ~= nil then
        -- upload error, handle.
    end

    local GetSuccess, Data = GetUserIDStore(UserID)
    if not GetSuccess and Data == nil then
        -- get error, handle.
    end

    local UpdatedTable = Data
    table.insert(UpdatedTable, ID)

    local SetSuccess, Message = SetUserIDStore(UserID, UpdatedTable)
    if not SetSuccess and Message ~= nil then
        -- set error, handle.
    end
end

local function RemoveOutfit(ID: str, UserID: int)
    local GetSuccess, Data = GetUserIDStore(UserID)
    if not GetSuccess and Data == nil then
        -- get error, handle.
    end

    if not table.find(Data, ID) then
        return false, ('User %i is not the owner of outfit (%s)').format(UserID, ID)
    end
    local UpdatedTable = Data
    table.remove(UpdatedTable, table.find(Data, ID))

    local SetSuccess, Message = SetUserIDStore(UserID, UpdatedTable)
    if not SetSuccess and Message ~= nil then
        -- set error, handle.
    end
end

local function GetOutfitFromID(ID)
    return GetOutfitIDStore(ID)
end

local function GetUserOufits(UserID)
    return GetUserIDStore(UserID)
end