From an ActiveAdmin Sidebar how can I know what action I am in?

Question

I wrote a custom ActiveAdmin Sidebar that adds context sensitive documentation to all the entities in my app.

I'd like the Sidebar to know what is the current controller action so to display more relevant information. Most importantly I'd like to know if the action is :index vs the other object specific actions.

To give you some more context, in case the action is :index I'd like to display a text that explains what the entity is, and if the action is :new or :edit I'd like to show a detail of all the object properties.

The code below gives you an idea of what I'm trying to achieve

module Help
  class HelpSidebar < ActiveAdmin::SidebarSection
    @@help

    def initialize
      @@help = YAML.load(File.read("app/admin/help/help.yml"))
      super "help", sidebar_options
    end

    def block
      -> do
        # if action == :index
          text_node @@help
            .dig(collection.klass.to_s, "text")
        # else
          ul do
            @@help
              .dig(collection.klass.to_s, "fields")
              .each do |key, value|
                li do
                  b "#{key.humanize}:"
                  text_node value
                end
              end
          end
        #end
      end
    end

    def title
      super
    end

    protected

    def sidebar_options
      { if: proc { @@help.key?(collection.klass.to_s) } }
    end
  end
end

Thanks for your help