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How can i access repository functions in twig template in symfony2
{% for category in categories %}
    --{{ category.name }}--
      {% for product in getProducts(category.id,location) %}
     --{{ product.name }}--
    {% endfor %}
 {% endfor %}

{% render '@MyBundle:Product:list' with {category: category.id} %}

class CategoryManager
{
    public function loadCategoriesProductsForLocation($location)
    {
        $qb = $this->em->->createQueryBuilder();

        $qb->addSelect('category');
        $qb->addSelect('product');

        $qb->from('MyBundleBundle:Category','category');

        $qb->leftJoin('category.products','product',
            ExprJoin::WITH, $qb->expr()->eq('product.location', $location));