PostInitPattern.gd

extends Node

func pack(p:Node)->PackedScene: var v = PackedScene.new(); v.pack(p); return v

class A extends Node:
	@export var m: String = "a"
	static func instantiate(p:PackedScene):
		var v: A = p.instantiate()
		v._post_init()
		return v
	func _init()->void: print(m) # this will always print "a"
	func _post_init()->void: print(m) # this will print whatever was the value was when the scene was packed

func _ready() -> void:
	var v: Variant = A.new() # v now is an "A" instance and will print "a"
	v.m = "my string"
	var p = pack(v) # p now is a PackedScene
	v = p.instantiate() # v now is a new "A" instance and will print "a"
	print(v.m) # will print "my string"
	print("\n")
	v = A.instantiate(p); breakpoint # will print "a" and then print "my string"