associated_records_by_owner

# File activerecord/lib/active_record/associations/preloader/association.rb, line 70
        def associated_records_by_owner
          owners_map = owners_by_key
          owner_keys = owners_map.keys.compact

          if klass.nil? || owner_keys.empty?
            records = []
          else
            # Some databases impose a limit on the number of ids in a list (in Oracle it's 1000)
            # Make several smaller queries if necessary or make one query if the adapter supports it
            sliced  = owner_keys.each_slice(model.connection.in_clause_length || owner_keys.size)
            records = sliced.map { |slice| records_for(slice) }.flatten
          end

          # Each record may have multiple owners, and vice-versa
          records_by_owner = Hash[owners.map { |owner| [owner, []] }]
          records.each do |record|
            owner_key = record[association_key_name].to_s

            owners_map[owner_key].each do |owner|
              records_by_owner[owner] << record
            end
          end
          records_by_owner
        end