Illuminate\Database\Eloquent\Model::getRelations PHP Method

    public function getRelations()
    {
        return $this->relations;
    }

 private function saveRelations()
 {
     /** @var Eloquent $related */
     foreach ($this->original->getRelations() as $related) {
         if ($related->isDirty()) {
             if ($related->save() === false) {
                 return false;
             }
         }
     }
     return true;
 }