rollback_active_record_state! (ActiveRecord::Transactions)

    # File lib/active_record/transactions.rb, line 204
        def rollback_active_record_state!
          id_present = has_attribute?(self.class.primary_key)
          previous_id = id
          previous_new_record = new_record?
          yield
        rescue Exception
          @new_record = previous_new_record
          if id_present
            self.id = previous_id
          else
            @attributes.delete(self.class.primary_key)
            @attributes_cache.delete(self.class.primary_key)
          end
          raise
        end