module ActiveAdmin::Resource::ActionItems

def add_default_new_action_item
  add_action_item :new, only: :index do
    if controller.action_methods.include?("new") && authorized?(ActiveAdmin::Auth::NEW, active_admin_config.resource_class)
      localizer = ActiveAdmin::Localizers.resource(active_admin_config)
      link_to localizer.t(:new_model), new_resource_path
    end
  end
end