public function prepare_item_for_response( $item, $request ) {
    // Restores the more descriptive, specific name for use within this method.
    $raw_pattern      = $item;
    $prepared_pattern = array(
      'id'             => absint( $raw_pattern->id ),
      'title'          => sanitize_text_field( $raw_pattern->title->rendered ),
      'content'        => wp_kses_post( $raw_pattern->pattern_content ),
      'categories'     => array_map( 'sanitize_title', $raw_pattern->category_slugs ),
      'keywords'       => array_map( 'sanitize_text_field', explode( ',', $raw_pattern->meta->wpop_keywords ) ),
      'description'    => sanitize_text_field( $raw_pattern->meta->wpop_description ),
      'viewport_width' => absint( $raw_pattern->meta->wpop_viewport_width ),
    );

    $prepared_pattern = $this->add_additional_fields_to_object( $prepared_pattern, $request );

    $response = new WP_REST_Response( $prepared_pattern );

    
/**
 * Filters the REST API response for a block pattern.
 *
 * @since 5.8.0
 *
 * @param WP_REST_Response $response    The response object.
 * @param object           $raw_pattern The unprepared block pattern.
 * @param WP_REST_Request  $request     The request object.
 */
    return apply_filters( 'rest_prepare_block_pattern', $response, $raw_pattern, $request );
  }