Reply To: Adding new field to existing posts

• Kevin Pliester

• April 21, 2018 at 12:14 am

Check this out:

$args = array(
  'post_type' => 'product', /* product post type */
  'posts_per_page' => -1 /* all products */
);

$products = new WP_Query( $args );

// check if products exists
if( $products->have_posts() ) {

  // loop products
  while( $products->have_posts() ): $products->the_post();

  // check if field exists
  if( !get_field( 'field_slug' ) ) {
    update_field( 'field_slug' ); /* update field */
  }
  
  endwhile; 

  // reset query to default query
  wp_reset_postdata();

}