# Filter results based on access rules
  def filter(results)
    results.delete_if do |res|
      case res
      when Contact
        # If you're not a manager of this client, you can't see their contacts
        if res.contactable.is_a?(Client)
          !current_user.manager?(res.contactable)
        end
      when Campaign
        # If you're not a manager of this client, you can't see their campaigns
        if res.client.is_a?(Client)
          !current_user.manager?(res.client)
        end
      end
    end
  end