public function getForeignKeyName()
    {
        $key = $this->getQualifiedForeignKeyName();

        if (is_array($key)) { //Check for multi-columns relationship
            return array_map(function ($k) {
                $segments = explode('.', $k);

                return $segments[count($segments) - 1];
            }, $key);
        } else {
            $segments = explode('.', $key);

            return $segments[count($segments) - 1];
        }
    }