class ActiveAdmin::ResourceController

def index(options={}, &block)
  super(options) do |format|
    block.call(format) if block
    format.html { render active_admin_template('index') }
    format.csv do
      headers['Content-Type'] = 'text/csv; charset=utf-8'
      headers['Content-Disposition'] = %{attachment; filename="#{csv_filename}"}
      render active_admin_template('index')
    end
  end
end