title: ActiveAdmin Collection action on filtered data
body: <p>I have a custom collection action on the index page, and I want to access the filtered data inside that action. How can I do this? Can I get the collection itself? or maybe the filter params?</p>
  
  <pre><code>  collection_action :do_something do
      # call some async process
      redirect_to :action =&gt; :index, :notice =&gt; "started working!"
    end
  
    action_item :only =&gt; :index do
      link_to('DO WORK', do_something_admin_game_stats_path)
    end
  </code></pre>