I'm trying to use Rules to populate a CCK field - a user reference when they flag a node. It basically works, but if there's already a user reference it overwrites it instead of adding another. That's not exactly what I want. I want the rule to add another user reference field to whichever ones are already there, then populate it with the user reference.

Do you have any idea?

Edit - What I eventually came up with, without Rules -

function bamfmodule_flag($action, $flag, $content_id, $account) {
  if($action == 'flag') {
    if ($flag->name == 'event_bookmark') {
        $node = node_load($content_id);
        array_push($node->field_trainer, $account->uid);

1 Answer 1


Does it need to be a user reference?

Assuming that you are not using a global flag (then you wouldn't have an issue with multiple users), that information should already be stored in the flag tables. You should be able to show that information with a view (which you can attach to the node with http://drupal.org/project/views_attach). Or if that doesn't work, do a custom query in a hook_node_view() implementation in a custom module.

And if it has to be a user reference for some reason, an unlimited multi-value user reference should be easier to handle with Rules than a unlimited number of user reference fields. CCK (nor Fields, for that matter) is just not designed for that. And you can only add fields to content types, not single nodes.

  • So, I've backed out of Rules and have gone the custom module route entirely, using hook_flag() to add the user to the database. The issue I'm running into now is that I think I need to use a CCK hook to do what I'm trying to do with regards to adding to the multi-value user reference - it just doesn't work very reliably by executing a query directly. Just keeping everybody posted, as I'll probably be asking a new question here pretty soon.
    – JGrubb
    Apr 28, 2011 at 22:39
  • I doubt there is anything else than $node = node_load($nid), change $node and then node_save($node).
    – Berdir
    Apr 29, 2011 at 0:17
  • Totally. It's just the change $node bit that I'm finding a bit tricky. How to append to field_userreference properly. I'm at function pgc_flags_flag($action, $flag, $content_id, $account) { if($action == 'flag') { if ($flag->name == 'event_bookmark') { $node = node_load($content_id); $users = $node->field_trainer; } } }
    – JGrubb
    Apr 29, 2011 at 17:03
  • Try dpm($node) (needs devel.module), that will print the structure of the node for you. Should be something like $node->field_trainer[] = $account->uid. Not 100% sure that it directly stores the uid property like that, so first look at the existing entries if there are any.
    – Berdir
    Apr 29, 2011 at 17:40
  • I was having trouble wrapping my head around how to add to $node->field_trainer. Turns out it was easier than I thought it was. Thanks for the help, it works now.
    – JGrubb
    Apr 29, 2011 at 18:53

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