/**
  * Controller for the base form.
  *
  * We need to override the functionality of the create form for pages
  * that include the rdf_entity id in the url so that the og audience field
  * is auto completed.
  *
  * @param \Drupal\rdf_entity\RdfInterface $rdf_entity
  *   The collection rdf_entity.
  *
  * @return array
  *   Return the form array to be rendered.
  */
 public function add(RdfInterface $rdf_entity)
 {
     // Setup the values for the release.
     $values = ['rid' => 'asset_release', 'field_isr_is_version_of' => $rdf_entity->id()];
     foreach ($this->fieldsToCopy as $solution_field => $release_field) {
         if (!empty($rdf_entity->get($solution_field)->getValue())) {
             $values[$release_field] = $rdf_entity->get($solution_field)->getValue();
         }
     }
     $asset_release = $this->entityTypeManager()->getStorage('rdf_entity')->create($values);
     $form = $this->entityFormBuilder()->getForm($asset_release);
     return $form;
 }