grouped_records

# File activerecord/lib/active_record/associations/preloader.rb, line 152
      def grouped_records(association, records)
        h = {}
        records.each do |record|
          next unless record
          assoc = record.association(association)
          klasses = h[assoc.reflection] ||= {}
          (klasses[assoc.klass] ||= []) << record
        end
        h
      end