Nextras\Orm\Entity\Reflection\EntityMetadata::getPrimaryKey PHP Метод

    public function getPrimaryKey()
    {
        return $this->primaryKey;
    }

 protected function addProperties(array $properties)
 {
     $path = $this->lookupPath(self::class, FALSE);
     $delimiter = strpos($path, '-');
     if ($delimiter !== FALSE) {
         $path = substr($path, 0, $delimiter);
     }
     $parent = $this->lookup(self::class, FALSE);
     if ($path && $parent instanceof self) {
         $parentProperty = $parent->getMetadata()->getProperty($path);
         if ($parentProperty->relationship && !$parentProperty->relationship->property) {
             $parent->relations[$path] = $this->getEntity();
         }
     }
     foreach ($properties as $metadata) {
         if (in_array($metadata->name, $this->metadata->getPrimaryKey())) {
             continue;
         }
         if ($path && $parent instanceof self && is_subclass_of($metadata->container, Nextras\Orm\Relationships\HasOne::class)) {
             if ($metadata->relationship && $metadata->relationship->property === $path && $metadata->relationship->repository === get_class($parent->getRepository())) {
                 $this->relations[$metadata->name] = $parent->getEntity();
                 continue;
             }
         }
         $this->addProperty($metadata);
     }
 }