After some tests, I realize that in group fields, ACF create fields named “field_***” (used for post_name) but after saving post_name become “field-***”.
The reason is that wp_insert_post() (used for creating field) sanitize post_name with sanitize_title function (check wp-includes/post.php on line 3189).
To prevent this, I have to add a filter to return original post_name.
In advanced-custom-fields-pro/api/api-field.php, I add in function acf_update_field() on line 839 :
add_filter( 'sanitize_title', 'acf_update_field_sanitize_title', 100, 3 );
just before :
$field['ID'] = wp_insert_post( $save );
and remove that filter just after saving :
remove_filter( 'sanitize_title', 'acf_update_field_sanitize_title', 100 );
And after acf_update_field :
function acf_update_field_sanitize_title ( $title, $raw_title, $context ) {
return $raw_title;
}
It seems to work for me…
Note :
if you don’t want to alter ACF sources, you can add this to your functions.php :
function acf_update_field_sanitize_title ( $title, $raw_title, $context ) {
return $raw_title;
}
// add filter for sanitize_title
add_filter( 'acf/update_field', function ( $field ) {
add_filter( 'sanitize_title', 'acf_update_field_sanitize_title', 100, 3 );
return $field;
}, 10, 1 );
// remove filter for sanitize_title
add_filter( 'wp_unique_post_slug', function ( $slug, $post_ID, $post_status, $post_type, $post_parent, $original_slug ) {
remove_filter( 'sanitize_title', 'acf_update_field_sanitize_title', 100 );
return $slug;
}, 10, 6 );
