{
      'Topic'          => all_class_results.where(searchable_type: 'Topic'),
      'StillImage'     => all_class_results.where(searchable_type: 'StillImage'),
      'AudioRecording' => all_class_results.where(searchable_type: 'AudioRecording'),
      'Video'          => all_class_results.where(searchable_type: 'Video'),