replace_records(new_target, original_target) private

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# File activerecord/lib/active_record/associations/collection_association.rb, line 405
        def replace_records(new_target, original_target)
          delete(difference(target, new_target))

          unless concat(difference(new_target, target))
            @target = original_target
            raise RecordNotSaved, "Failed to replace #{reflection.name} because one or more of the "                                    "new records could not be saved."
          end

          target
        end
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