theme_hook_suggestions based on empty field

Question

I'm trying to implement theme_hook_suggestions in preprocess node template based on the fact that a field (field_logo) is empty or not.

The template change is not working.

Can anyone help?

This is the code that I have so far:

function community_alpha_preprocess_node(&$vars) {
  $node = $vars['node'];
  if(($node->type == 'advertorial') && !$teaser && $node_top){
    $advertorial_type = $node->field_logo['und'][0]['tid'];
    if(!empty($advertorial_type)){
      $vars['theme_hook_suggestions'] = 'node__advertorial';
    }else{
      $vars['theme_hook_suggestions'] = 'node__advertorial__alt';
    }
  }

}

Thanks.

Answer 1

You need to clear the cache after making changes in the template.php file.

For Drupal 7 version please run below command to clear the cache and check aftewards.

drush cc all

For Drupal 8 version please run below command to clear the cache and check afterwards.

drush cache-clear

Answer 2

I believe there was a problem with the first conditional loop. I also removed ['und'], [0] and ['tid'] from field_logo.

So here's the final code that seems to work.

Thanks for the help.

function community_alpha_preprocess_node(&$vars) {
  $node = $vars['node'];
  if($node->type == 'advertorial'){
    $advertorial_type = $node->field_logo;
    if(!empty($advertorial_type)){
      $vars['theme_hook_suggestions'][] = 'node__advertorial';
    }else{
      $vars['theme_hook_suggestions'][] = 'node__advertorial__alt';
    }
  }
}