Serialized array for select_advanced saves incorrectly on front-end submission

Hi Anh,

I have an update.

I discovered that the issue was actually occurring for all front-end select_advanced or select fields with multiple set to TRUE regardless of whether there are multiple MetaBoxes or not.

I had come across this with another metabox and created a workaround that led me to believe it wasn't happening.

The workaround hooks rwmb_{metabox_id}after_save_post and strips the string notation off of the serialized array.

Like so:

function obh_update_group_primary_contact($post_id) {
  global $wpdb;
  $table = $wpdb->prefix . '_group_contact_info';
  $result = $wpdb->get_row(
    "SELECT * 
    FROM $table 
    WHERE ID = $post_id"
  );
 
  $primary_contact = $result->obh_group_primary_contact;
 
  $string_query = stripos( $primary_contact, 's:' );
    
  if($string_query !==false) {
     $ass_array = preg_split('/^[s]\:([1-9][0-9]{0,2})\:\"/', $primary_contact);
    $string_1 = $ass_array[1];
    $string_2 = rtrim($string_1,'";');
  } else {
    $string_2 = $primary_contact;
  }
  
  if($string_2){
    $wpdb->update(
      $table,
      array('obh_group_primary_contact' => $string_2),
      array('ID' => $post_id )
    );
  }
}

add_action( 'rwmb_obh_group_description_after_save_post', 'obh_update_group_primary_contact' );

As far as I'm concerned, this is solved for me. Please let me know if you uncover a better way to address it in core. I'm always happy to implement your updates.

Thanks for all your hard work and the tremendous plugins!

That's basically it. The only difference is that I have several MetaBoxes per post type with several fields all writing to their own tables.

I also have several things hooked to save_post... there could be something in there causing the issue.

We can close this for now as I'm thinking it must be on my end somehow. I'll let you know if I discover anything else related to this issue.

Thanks again!