Challenge #1 of 1

Q: 

Imagine we have the following code in a Twig template:

{% for product in category.products %}
    {{ product.name }}
{% endfor %}

To fetch the Category object, in the controller, we call this method on CategoryRepository:

public function findBySlug(string $slug): ?Category
{
    return $this->createQueryBuilder('category')
        ->andWhere('category.slug = :slug')
        ->setParameter('slug', $slug);
        ->getQuery()
        ->getOneOrNullResult();
    }
}

But when I load the page... I have 11 queries just to render 10 products! Yikes! To try to fix this, I made this change:

public function findBySlug(string $slug): ?Category
{
   return $this->createQueryBuilder('category')
        ->andWhere('category.slug = :slug')
        ->setParameter('slug', $slug);
+       ->leftJoin('category.product', 'product')
+       ->addSelect('product')
       ->getQuery()
       ->getOneOrNullResult();
   }
}

Will this reduce my queries? And, do I need to tweak any other parts of my code?