json.array! @facets do |facet_obj|
  json.name facet_obj.name
  json.count facet_obj.count
  json.included_objs do
    formatted_objs = facet_obj.included_objs.map do |obj|
      @formatter.call(obj, scrivito_user, controller.view_context)
    end
    json.merge!(formatted_objs)
  end
end