def commit
  @state.commit!
end

def full_rollback?; false; end

def initialize(connection, parent_transaction, **options)
  super(connection, **options)
  @parent = parent_transaction
  if isolation_level
    raise ActiveRecord::TransactionIsolationError, "cannot set transaction isolation in a nested transaction"
  end
  @parent.state.add_child(@state)
end

def rollback
  @state.rollback!
  @parent.restart
end