Taxonomies with single term not showing up on node add/edit form

Same problem here... I forgot about this quirk until I did an upgrade of tac_lite today and started running into the problem again. I'm pretty sure there was a patch to an older version to fix this. If I can find the fix I'll try to post it here for you!

Found it. Line 51 of tac_lite_create.module in 6.x-1.5. The intended functionality is to hide the term "none" if it is the only term, but some of us obviously use this module to only show/assign one term to a customer. More robust checking of the actual value of the term should be implemented. For me though, I don't care if a term shows so I've attached a patch that just comments out the bad lines.

If you don't want to apply the patch, just go and comment out the following (tac_lite_create.module line 51):
if (count($form['taxonomy'][$vid]['#options']) <= 1) {
// Don't show if the only option left is .
unset($form['taxonomy'][$vid]);
}

The problem is still there in the 7.x-1.x version. Here is a patch that fixes it by checking if the only remaining item in the select is a taxonomy term on which the user has access to.

Thanks for pointing out the problem exists in 7.x, I was no aware.

Wouldn't the fix be more efficient to try something like

if (count($form[$field_name][$field_language]['#options']) <= 1 && isset($form[$field_name][$field_language]['#options'][0])) {
  // snip...
}

I'm not actually sure if none's index is 0 or -1. I don't think the array_intersect() code is easy to understand.

I am not sure either which is none's index (_none ?). It would work as well, and yes, could be easier to understand.

I think it may be _none, from options.module. Jeez it's hard to find anything in Drupal anymore. Too bad it's not a constant.

I don't have a test case for this handy. Can you try testing for '_none' and update the patch?

Yes, it is _none.

Ref (options.module, line 255):

$label = theme('options_none', array('instance' => $instance, 'option' => $properties['empty_option']));
$options = array('_none' => $label) + $options;

I attached the updated patch, should be working well.

I pushed the fix to 7.x. Still needs backport to 6.x.

I cleaned up the logic slightly:

      // Don't show if the only option left is <none>.
      if (empty($form[$field_name][$field_language]['#options']) ||
          (count($form[$field_name][$field_language]['#options']) == 1 && isset($form[$field_name][$field_language]['#options']['_none']))) {                                                                                                                        
        $form[$field_name]['#access'] = FALSE; 
      } 

Thank you for contribution. 👍
Drupal 6 is no longer supported. 🤷‍♂️
Closing as outdated. 🔐