if Rails.env.training?
    has_attached_file :thumbnail,
      storage: :fog,
      fog_credentials: {
        aws_access_key_id: NitroConfig.get("s3/training_read_only_access_key"),
        aws_secret_access_key: 'production_secret_acesss_key'
      },
      fog_directory: 'production_bucket_name'
  else
    has_attached_file :thumbnail, styles: { small: "75x75#", medium: '256x256#' }, default_url: ActionController::Base.helpers.image_path("/assets/logos/:style/power_logo_transparent.png")
  end