# File lib/rbrainz/model/scored_collection.rb, line 43
        def <=>(other)
          if self.score.nil? && other.score.nil?
            return self.entity <=> other.entity
          end
          return -1 if self.score.nil?
          return 1 if other.score.nil?
          
          return self.score <=> other.score
        end