concat(*records) public

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# File activerecord/lib/active_record/associations/has_many_through_association.rb, line 30
      def concat(*records)
        unless owner.new_record?
          records.flatten.each do |record|
            raise_on_type_mismatch(record)
            record.save! if record.new_record?
          end
        end

        super
      end
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