Module: RRF::Model::ClassMethods

Defined in:
lib/rrf.rb

Instance Method Summary collapse

Instance Method Details

#fuse(*result_sets, limit: 10) ⇒ Object 



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# File 'lib/rrf.rb', line 26

def fuse(*result_sets, limit: 10)
  rank_bias = RRF.configuration.rank_bias
  record_scores = Hash.new { |hash, key| hash[key] = { score: 0, id: key, sources: [] } }
  
  result_sets.each do |result_set|
    if result_set.is_a?(ActiveRecord::Relation)
      result_set.select(:id).each_with_index do |record, index|
        score = 1.0 / (rank_bias + index)
        record_scores[record.id][:score] += score
        record_scores[record.id][:sources] << :active_record
      end
    elsif result_set.is_a?(Searchkick::Relation)
      result_set.hits.each_with_index do |hit, index|
        id = hit["_id"]
        score = 1.0 / (rank_bias + index)
        record_scores[id][:score] += score
        record_scores[id][:sources] << :searchkick
      end
    else
      raise RRF::Error, "Unsupported result set type: #{result_set.class}"
    end
  end

  # Sort by score and limit results
  top_record_ids = record_scores.sort_by { |_id, result| -result[:score] }.to_h.keys.first(limit)

  # Load actual records from ActiveRecord
  self.where(id: top_record_ids).index_by(&:id).values_at(*top_record_ids).each do |record|
    record.define_singleton_method(:_rrf_score) { record_scores[record.id][:score] }
  end
end