我如何才能在Godot 3.1中获得一个部门的其余部分？

var department = get_node("department")
var restOfDepartment = department.get_node("rest_of_department")

# 部门的其余部分节点
extends Node2D

signal department_changed

# 触发部门变化的某个操作
func change_department():
    # 部门变化的逻辑...
    emit_signal("department_changed")

# 部门的父节点
extends Node2D

func _ready():
    var department = get_node("department")
    department.connect("department_changed", self, "_on_department_changed")

func _on_department_changed():
    # 部门变化后的操作...