Profile: Pat

Problem:

The issue here is that the user wanted to list out all their posts that do not have a specific custom field.

Solution:

Unfortunately this isn't possible to do through the use of the User interface and as such a custom filter is required.

The code below should be able to resolve this.

add_filter( 'wpv_filter_query', 'display_not_exist_posts', 99, 3 );
function display_not_exist_posts( $query_args, $view_settings, $views_id  ) {
    if ( $views_id == 123 ) { // if it is specific view and by default
        $query_args['meta_query'][] = array(
                'key'     => 'wpcf-customfieldslug', 
                   'compare' => 'NOT EXISTS',
        );
    }
    return $query_args;
}

Add this code to the Toolset custom code section in Toolset->Settings->Custom code and activate it.

Change 123 to the ID of your view and wpcf-customfeldslug to the slug of your custom field keeping the wpcf- slug