code: public function getValues(\ElggEntity $entity) {
  		$sticky = $this->getStickyValue();
  		$values = array();
  		if (!$sticky) {
  			if ($entity->guid) {
  				$entities = elgg_get_entities_from_relationship(array(
  					'relationship_guid' => $entity->guid,
  					'relationship' => $this->getShortname(),
  					'inverse_relationship' => $this->inverse_relationship,
  					'limit' => 0,
  					'callback' => false,
  				));
  				if (is_array($entities) && count($entities)) {
  					foreach ($entities as $entity) {
  						$values[] = $entity->guid;
  					}
  				}
  			}
  		} else {
  			$values = $sticky;
  		}
  
  		return $values;
  	}
docs: {@inheritdoc}