I'm trying to use add_to() in the latest version of Pods (2.3.18) and it doesn't seems to be creating the relationship in the database table (wp_postmeta). What I'm doing is:
$postPod = pods("post", $post_id);
$postPod->add_to("field", "valueID");
But the meta_key "field" doesn't appear in the database table.
How can I properly use this add_to function? I didn't find any examples in the documentation.