gistfile1.ru

  define_index do
    ...
    # it should be this
    indexes genres(:name)

    # indexes special_tags(:name), :as => 'special_tags'
    # and the ugly way to get special_tags working
    indexes "GROUP_CONCAT(DISTINCT `special_tags_performances`.`name` SEPARATOR ' ')", :as => 'special_tags'
    set_property :custom_joins => "LEFT OUTER JOIN `taggings` special_tags_performances_join ON (`performances`.`id` = `special_tags_performances_join`.`taggable_id` AND `special_tags_performances_join`.`taggable_type` = 'Performance')  LEFT OUTER JOIN `tags` special_tags_performances ON (`special_tags_performances`.`id` = `special_tags_performances_join`.`tag_id`) AND `special_tags_performances`.`context` = 'special_tags'"

    ...
  end