ActiveAdmin如何在没有模型的情况下添加自定义控制器

class CustomController< ApplicationController
  def index
    # 在这里编写自定义控制器逻辑
  end
end

Rails.application.routes.draw do
  get 'custom', to: 'custom#index'
end

ActiveAdmin.register_page "CustomController" do
  menu label: "Custom Controller", parent: "Dashboard"

  content do
    link_to "Go to Custom Controller", "/custom"
  end
end

ActiveAdmin.register_page "Dashboard" do
  menu priority: 1, label: proc { I18n.t("active_admin.dashboard") }

  content title: proc { I18n.t("active_admin.dashboard") } do
    # 在这里添加自定义内容
  end

  page_action :custom_controller, method: :get do
    redirect_to "/custom"
  end
end