discourse/db/fixtures/500_lounge_category.rb

lounge = Category.where(id: SiteSetting.lounge_category_id).first
if lounge and !lounge.group_ids.include?(Group[:trust_level_3].id)

  # The category for users with trust level 3 has been created.
  # Add permissions and a description to it.

  lounge.group_names = ['trust_level_3']
  unless lounge.save
    puts lounge.errors.full_messages
    raise "Failed to set permissions on trust level 3 lounge category!"
  end

  creator = PostCreator.new(Discourse.system_user,
    raw: I18n.t('vip_category_description'),
    title: I18n.t('category.topic_prefix', category: lounge.name),
    category: lounge.name,
    archetype: Archetype.default
  )
  post = creator.create

  unless post && post.id
    puts post.errors.full_messages if post
    puts creator.errors.inspect
    raise "Failed to create description for trust level 3 lounge!"
  end

  lounge.topic_id = post.topic.id
  unless lounge.save
    puts lounge.errors.full_messages
    puts "Failed to set the lounge description topic!"
  end

  # Reset topic count because we don't count the description topic
  Category.exec_sql "UPDATE categories SET topic_count = 0 WHERE id = #{lounge.id}"
end