Check if relation is loaded

Hi, I was wondering if is it possible to check if a relationship is loaded.

I'm using eager loading and caché so when I'm at a model instance I want to :

• check if the relationship is loaded,

• if it's not, then I will try to take it from caché,

• if not I fetch it using getRelated.

*1 My problem here is that when I try to check if it's null, it automagically loads the relationship, avoiding the caché layer. So, summing up in pseudocode:

public function getMyRelationship()
{
     $cache_key = '....';
     $ttl = 10 * 60;
     if($this->myRelationsip === null) {  // check if the related models are already fetched // *1
              // get from cache or execute function to fetch the related models
              $this->myRelationship = $this->cache->remember($cache_key, $ttl, function() { 
                      return $this->getRelated('myRelationship');
               }
     }

     return $this->myRelationship;  
}