LeanMapper\Relationship\HasOne::getColumnReferencingTargetTable PHP Method

    public function getColumnReferencingTargetTable()
    {
        return $this->columnReferencingTargetTable;
    }

 /**
  * @param Property $property
  * @param Relationship\HasOne $relationship micro-optimalization
  * @param Filtering|null $filtering
  * @throws InvalidValueException
  * @return Entity
  */
 private function getHasOneValue(Property $property, Relationship\HasOne $relationship, Filtering $filtering = null)
 {
     $targetTable = $relationship->getTargetTable();
     $row = $this->row->referenced($targetTable, $relationship->getColumnReferencingTargetTable(), $filtering);
     if ($row === null) {
         if (!$property->isNullable()) {
             $name = $property->getName();
             throw new InvalidValueException("Property '{$name}' cannot be null in entity " . get_called_class() . '.');
         }
         return null;
     } else {
         $entityClass = $this->mapper->getEntityClass($targetTable, $row);
         $entity = $this->entityFactory->createEntity($entityClass, $row);
         $this->checkConsistency($property, $entityClass, $entity);
         $entity->makeAlive($this->entityFactory);
         return $entity;
     }
 }