concat_records

# File activerecord/lib/active_record/associations/has_many_through_association.rb, line 41
      def concat_records(records)
        ensure_not_nested

        records = super(records, true)

        if owner.new_record? && records
          records.flatten.each do |record|
            build_through_record(record)
          end
        end

        records
      end