PartKeepr\DoctrineReflectionBundle\Filter\AssociationPropertyInterface::getAssociation PHP Method

    public function getAssociation();

 /**
  * Adds all required joins to the queryBuilder.
  *
  * @param QueryBuilder $queryBuilder
  * @param              $filter
  */
 private function addJoins(QueryBuilder $queryBuilder, AssociationPropertyInterface $filter)
 {
     if (in_array($filter->getAssociation(), $this->joins)) {
         // Association already added, return
         return;
     }
     $associations = explode('.', $filter->getAssociation());
     $fullAssociation = 'o';
     foreach ($associations as $key => $association) {
         if (isset($associations[$key - 1])) {
             $parent = $associations[$key - 1];
         } else {
             $parent = 'o';
         }
         $fullAssociation .= '.' . $association;
         $alias = $this->getAlias($fullAssociation);
         $queryBuilder->join($parent . '.' . $association, $alias);
     }
     $this->joins[] = $filter->getAssociation();
 }