```ruby
class EditionDuplicator
  attr_accessor :existing_edition, :actor, :error_message, :new_edition

  # existing_edition: The existing edition to be duplicated
  # actor:            The WorkflowActor (usually a user) to perform the action
  def initialize(existing_edition, actor)
    self.existing_edition = existing_edition
    self.actor            = actor
  end

  # new_format : A new format to create (eg. 'answer')
  # assign_to  : The User who the new item should be assigned to for further
  #              work.
  def duplicate(new_format = nil, assign_to = nil)
    self.new_edition = actor.new_version(existing_edition, new_format)

    if new_edition && new_edition.save
      update_assignment(assign_to)
      true
    else
      false
    end
  end

  def error_message
    unless new_edition.is_a?(Edition) && new_edition.errors.empty?
      alert = 'Failed to create new edition'
      alert += new_edition ? ": #{new_edition.errors.inspect}" : ": couldn't initialise"
      alert
    end
  end

  protected
  def update_assignment(assign_to)
    if assign_to
      actor.assign(new_edition, assign_to)
    end
  end
end```

Update description of the new_format parameter
user
```ruby
class EditionDuplicator
  attr_accessor :existing_edition, :actor, :error_message, :new_edition

  # existing_edition: The existing edition to be duplicated
  # actor:            The WorkflowActor (usually a user) to perform the action
  def initialize(existing_edition, actor)
    self.existing_edition = existing_edition
    self.actor            = actor
  end

  # new_format : The format of the new edition (eg. 'answer')
  # assign_to  : The User who the new item should be assigned to for further
  #              work.
  def duplicate(new_format = nil, assign_to = nil)
    self.new_edition = actor.new_version(existing_edition, new_format)

    if new_edition && new_edition.save
      update_assignment(assign_to)
      true
    else
      false
    end
  end

  def error_message
    unless new_edition.is_a?(Edition) && new_edition.errors.empty?
      alert = 'Failed to create new edition'
      alert += new_edition ? ": #{new_edition.errors.inspect}" : ": couldn't initialise"
      alert
    end
  end

  protected
  def update_assignment(assign_to)
    if assign_to
      actor.assign(new_edition, assign_to)
    end
  end
end```
assistant