CiviCRM Community Forums (archive)

I've got a custom data group assigned to a 'membership' type, with two fields in which I want to record the Drupal webform nid and sid (more on that in a sec). I've created a profile that has these fields, and I've added that profile to a Membership Contribution Page. I've successfully grabbed the nid and sid from the url in a BuildForm hook, and (also successfully) $form->setDefaults() for the two custom fields - they show up as expected on my membership contrib form.

However: when I submit the form, the membership is created, but the custom data is not saved.

Any thoughts? Holes in my process? Suggestions or incantations?

I wondered as much, but where is the relevant membershipId to be found once I'm I'm postProcess? I understand that the membership itself (as well as the contribution?) has been created at that point, and I'm itching to chain some API calls in response, but don't know how to get those key ids...

Okay, using API v3, would I then do something like the following (meaning, this is what I tried, without luck)?

    $params = array(
      'membership_id' => $form->_values['membership_id'],
      'custom_15' => $form->_submitValues['custom_15'],
      'custom_16' => $form->_submitValues['custom_16'],
      'version' => 3,
    );
   
    require_once 'api/api.php';
    $result = civicrm_api( 'membership','update',$params );

I've confirmed that those _submitValues are there in the $form object at the time the above api is called, and the $result array returns is_error = 0 and all the other expected values from the membership creation. But the custom data values haven't been set for the membership in question.

For some reason the API won't update fields that are set to "backend only" which makes me wonder how we are supposed to be setting them from the backend if not with the API.