PHP

laravel has many deep

class User extends Model {
    use StaudenmeirEloquentHasManyDeepHasRelationships;

    public function cards() {
        return $this->hasManyDeep(Card::class, [Subject::class, Deck::class]);
    }
}

laravel has many deep

//AppUser;

public function cards()
{
    Card::whereHas('decks', function($q){
         return $q->whereHas('subjects', function($q){
            return $q->where('user_id', $this->id);
        });
    });
}

laravel has many deep

$user->cards()->get();