You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: demos_controller.rb
    path of file: ./repos/code_fund_ads/app/controllers
    
    the code of the file until where you have to start completion: class DemosController < ApplicationController
  before_action :load_campaigns

  layout "demo"
  helper_method :position
  ABSOLUTE = ["bottom-bar"
    
  def load_campaigns
    @campaigns = if authorized_user&.can_admin_system?
      Campaign.all.order(name: :asc)
    elsif current_user&.campaigns
      current_user.campaigns.order(name: :asc)
    else
      []
    end