future_cached.html.erb

<h1>This is a page with a report on it:</h1>

<h2>Long Running Report</h2>
<% future_cache("long running report for user #{current_user.id}", {:ttl => 1.day, :callback => current_user.deliver_report_finished_email}) do %>

<% render :partial => 'report', :collection => current_user.reports.big %>

<% else %>
<strong> This report is being generated, you will receive an email when it's complete</strong>
<% end %>