sunspot_search.rb

        Sunspot.search(Person) do
          keywords(query_string) do
            boost_fields query_boost_fields

            highlight(*fields_to_highlight.push(:fragment_size => default_highlight_fragment_size))
          end

          facet(:class)

          #
          # Very ugly hack to allow facets for all data types
          #
          adjust_solr_params do |params|
            params[:fq] = ["{!tag=type_filter}type:Person"]
            params[:"facet.field"] = ["{!ex=type_filter}class_name"]
          end
        end