Example of framework coupled controller. Entire repo: https://github.com/CodelyTV/coupled-code-example/blob/master/src/AppBundle/Controller/CourseController.php

CourseController.php

<?php
namespace AppBundle\Controller;
use FOS\RestBundle\Controller\FOSRestController;
use Symfony\Component\HttpFoundation\Request;
final class CourseController extends FOSRestController
{
    public function getCourseAction(Request $request)
    {
        return $this->getDoctrine()
            ->getEntityManager()
            ->createQueryBuilder()
            ->select('c', 'v')
            ->from('AppBundle\Model\Course', 'c')
            ->where('c.level', '>', $request->get('from_level', 0))
            ->getQuery()
            ->execute();
    }
    public function getCourseVideosAction($courseId)
    {
        return $this->getDoctrine()
            ->getEntityManager()
            ->createQueryBuilder()
            ->select('c', 'v')
            ->from('AppBundle\Model\Course', 'c')
            ->leftJoin('a.Video', 'v')
            ->where('c.id', '=', $courseId)
            ->getQuery()
            ->execute();
    }
}