```ruby
class RegisterableEdition
  attr_accessor :edition

  def initialize(edition)
    @edition = edition
  end

  def ==(other)
    edition == other.edition
  end

  def slug
    # strip the preceding slash character from the generated slug,
    # to be consistent with Panopticon's slug format.
    Whitehall.url_maker.public_document_path(edition).sub(/\A\//, "")
  end

  def paths
    if kind == "detailed_guide"
      ["/#{slug}"]
    else
      []
    end
  end

  def prefixes
    []
  end

  def title
    edition.title
  end

  def description
    edition.summary
  end

  def kind
    model_type = "#{edition.type.underscore}_type".to_sym
    edition.respond_to?(model_type) ? edition.send(model_type).key : edition.type.underscore
  end

  def state
    if archivable?
      "archived"
    else
      edition.state == "published" ? "live" : "draft"
    end
  end

  def need_ids
    edition.need_ids
  end

  def specialist_sectors
    [edition.primary_specialist_sector_tag].compact + edition.secondary_specialist_sector_tags
  end

  def organisation_ids
    registered_organisations.map(&:slug)
  end

  def registered_organisations
    if edition.respond_to?(:organisations)
      edition.organisations.reject {|organisation| organisation.is_a?(WorldwideOrganisation) }
    else
      []
    end
  end

private

  def archivable?
    edition.state == "archived" || edition.state == "deleted"
  end
end
```

Clean logic for setting registerable edition state
user
```ruby
class RegisterableEdition
  attr_accessor :edition

  def initialize(edition)
    @edition = edition
  end

  def ==(other)
    edition == other.edition
  end

  def slug
    # strip the preceding slash character from the generated slug,
    # to be consistent with Panopticon's slug format.
    Whitehall.url_maker.public_document_path(edition).sub(/\A\//, "")
  end

  def paths
    if kind == "detailed_guide"
      ["/#{slug}"]
    else
      []
    end
  end

  def prefixes
    []
  end

  def title
    edition.title
  end

  def description
    edition.summary
  end

  def kind
    model_type = "#{edition.type.underscore}_type".to_sym
    edition.respond_to?(model_type) ? edition.send(model_type).key : edition.type.underscore
  end

  def state
    case edition.state
    when "archived", "deleted"
      "archived"
    when "published"
      "live"
    else
      "draft"
    end
  end

  def need_ids
    edition.need_ids
  end

  def specialist_sectors
    [edition.primary_specialist_sector_tag].compact + edition.secondary_specialist_sector_tags
  end

  def organisation_ids
    registered_organisations.map(&:slug)
  end

  def registered_organisations
    if edition.respond_to?(:organisations)
      edition.organisations.reject {|organisation| organisation.is_a?(WorldwideOrganisation) }
    else
      []
    end
  end
end
```
assistant