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  public function ajax_background_add() {
    check_ajax_referer( 'background-add', 'nonce' );

    if ( ! current_user_can( 'edit_theme_options' ) ) {
      wp_send_json_error();
    }

    $attachment_id = absint( $_POST['attachment_id'] );
    if ( $attachment_id < 1 ) {
      wp_send_json_error();
    }

    update_post_meta( $attachment_id, '_wp_attachment_is_custom_background', get_stylesheet() );

    wp_send_json_success();
  }