# File activerecord/lib/active_record/connection_adapters/abstract/transaction.rb, line 405
      def initialize(connection, savepoint_name, parent_transaction, **options)
        super(connection, **options)

        parent_transaction.state.add_child(@state)

        if isolation_level
          raise ActiveRecord::TransactionIsolationError, "cannot set transaction isolation in a nested transaction"
        end

        @savepoint_name = savepoint_name
      end

# File activerecord/lib/active_record/connection_adapters/abstract/transaction.rb, line 439
      def commit
        connection.release_savepoint(savepoint_name) if materialized?
        @state.commit!
        @instrumenter.finish(:commit) if materialized?
      end

# File activerecord/lib/active_record/connection_adapters/abstract/transaction.rb, line 445
      def full_rollback?; false; end

# File activerecord/lib/active_record/connection_adapters/abstract/transaction.rb, line 417
      def materialize!
        connection.create_savepoint(savepoint_name)
        super
      end

# File activerecord/lib/active_record/connection_adapters/abstract/transaction.rb, line 422
      def restart
        return unless materialized?

        @instrumenter.finish(:restart)
        @instrumenter.start

        connection.rollback_to_savepoint(savepoint_name)
      end

# File activerecord/lib/active_record/connection_adapters/abstract/transaction.rb, line 431
      def rollback
        unless @state.invalidated?
          connection.rollback_to_savepoint(savepoint_name) if materialized? && connection.active?
        end
        @state.rollback!
        @instrumenter.finish(:rollback) if materialized?
      end