Quick Initialization of Persistent Data

[carsakiller]

This tip is a pretty quick and easy one but I found it to be a nice little trick for initializing g_savedata values.

In onCreate(), you will have to get the values that you have stored in g_savedata, something like so:

function onCreate()
    G_vehicles = g_savedata.vehicles
end

There is an issue with this, however. If this save is brand new, then g_savedata.vehicles is nil. Instead, we would like to initialize it as an empty table. You could do the following:

function onCreate(newSave)
    if newSave then
        g_savedata.vehicles = {}
    else
        g_savedata.vehicles = g_savedata.vehicles
    end
end

However, I find a much cleaner and more reliable option to be the following:

function onCreate()
    g_savedata.vehicles = g_savedata.vehicles or {}
end

This means that g_savedata.vehicles will be equal to the g_savedata.vehicles table if it is not nil or false and if it is, then g_savedata.vehicles will be an empty table {}. And that is how we initialize all of our g_savedata variables for Carsa's Commands. We also define some shorter names just to make our lives easier.

Carsas-CommandsV2/src/script.lua

Lines 2959 to 2981 in 7039894

	g_savedata.version = SaveDataVersion
	g_savedata.autosave = g_savedata.autosave or 1
	g_savedata.is_dedicated_server = g_savedata.is_dedicated_server or false
	-- define if undefined
	g_savedata.vehicles = g_savedata.vehicles or {}
	g_savedata.objects = g_savedata.objects or {}
	g_savedata.players = g_savedata.players or {}
	g_savedata.roles = g_savedata.roles or deepCopyTable(DEFAULT_ROLES)
	g_savedata.unique_players = g_savedata.unique_players or 0
	g_savedata.preferences = g_savedata.preferences or deepCopyTable(PREFERENCE_DEFAULTS)
	g_savedata.rules = g_savedata.rules or {}
	g_savedata.aliases = g_savedata.aliases or deepCopyTable(DEFAULT_ALIASES)
	g_savedata.companionTokens = g_savedata.companionTokens or {}
	-- create references to shorten code
	G_vehicles = G_vehicles or new(VehicleContainer) ---@type VehicleContainer
	G_objects = g_savedata.objects -- Not in use yet
	G_players = new(PlayerContainer) ---@type PlayerContainer
	G_roles = new(RoleContainer) ---@type RoleContainer
	G_rules = new(Rules) ---@type Rules
	G_preferences = g_savedata.preferences
	G_aliases = g_savedata.aliases
	G_companionTokens = g_savedata.companionTokens