diff --git a/src/Bundle/ChillTaskBundle/Controller/SingleTaskController.php b/src/Bundle/ChillTaskBundle/Controller/SingleTaskController.php
index be39f4900..71301dd40 100644
--- a/src/Bundle/ChillTaskBundle/Controller/SingleTaskController.php
+++ b/src/Bundle/ChillTaskBundle/Controller/SingleTaskController.php
@@ -2,6 +2,7 @@
 
 namespace Chill\TaskBundle\Controller;
 
+use Chill\MainBundle\Entity\Center;
 use Chill\MainBundle\Entity\Scope;
 use Chill\PersonBundle\Privacy\PrivacyEvent;
 use Psr\Log\LoggerInterface;
@@ -24,15 +25,16 @@ use Chill\PersonBundle\Security\Authorization\PersonVoter;
 use Chill\PersonBundle\Repository\PersonRepository;
 use Chill\TaskBundle\Event\TaskEvent;
 use Symfony\Component\EventDispatcher\EventDispatcherInterface;
-use Symfony\Component\Translation\TranslatorInterface;
 use Chill\TaskBundle\Event\UI\UIEvent;
 use Chill\MainBundle\Repository\CenterRepository;
+use Chill\MainBundle\Repository\ScopeRepository;
+use Chill\MainBundle\Repository\UserRepository;
 use Chill\MainBundle\Timeline\TimelineBuilder;
 use Chill\PersonBundle\Entity\AccompanyingPeriod;
 use Chill\PersonBundle\Repository\AccompanyingPeriodRepository;
 use Chill\PersonBundle\Security\Authorization\AccompanyingPeriodVoter;
 use Doctrine\ORM\EntityManagerInterface;
-use Symfony\Component\HttpFoundation\RequestStack;
+use Doctrine\ORM\EntityRepository;
 use Symfony\Contracts\Translation\TranslatorInterface as TranslationTranslatorInterface;
 
 /**
@@ -42,27 +44,23 @@ use Symfony\Contracts\Translation\TranslatorInterface as TranslationTranslatorIn
  */
 class SingleTaskController extends AbstractController
 {
+    protected EventDispatcherInterface $eventDispatcher;
     
-    /**
-     * @var EventDispatcherInterface
-     */
-    protected $eventDispatcher;
+    protected TimeLineBuilder $timelineBuilder;
     
-    /**
-     *
-     * @var TimelineBuilder
-     */
-    protected $timelineBuilder;
-    
-    /**
-     * @var LoggerInterface
-     */
-    protected $logger;
+    protected LoggerInterface $logger;
 
-    /**
-     * @var RequestStack
-     */
-    protected $request;
+    protected EntityRepository $personRepository;
+
+    protected EntityRepository $courseRepository;
+
+    protected SingleTaskRepository $taskRepository;
+
+    protected EntityRepository $userRepository;
+
+    protected EntityRepository $centerRepository;
+
+    protected EntityRepository $scopeRepository;
     
     /**
      * SingleTaskController constructor.
@@ -73,20 +71,25 @@ class SingleTaskController extends AbstractController
         EventDispatcherInterface $eventDispatcher,
         TimelineBuilder $timelineBuilder,
         LoggerInterface $logger,
-        RequestStack $requestStack
+        EntityManagerInterface $em
     ) {
         $this->eventDispatcher = $eventDispatcher;
         $this->timelineBuilder = $timelineBuilder;
         $this->logger = $logger;
-        $this->request = $requestStack->getCurrentRequest();
+        $this->personRepository = $em->getRepository(Person::class);
+        $this->courseRepository = $em->getRepository(AccompanyingPeriod::class);
+        $this->taskRepository = $em->getRepository(SingleTask::class);
+        $this->userRepository = $em->getRepository(User::class);
+        $this->centerRepository = $em->getRepository(Center::class);
+        $this->scopeRepository = $em->getRepository(Scope::class);
     }
 
     
-    private function getEntityContext()
+    private function getEntityContext(Request $request)
     {
-        if($this->request->query->has('person_id')){
+        if($request->query->has('person_id')){
             return 'person';
-        } else if ($this->request->query->has('course_id')) {
+        } else if ($request->query->has('course_id')) {
             return 'course';
         } else {
            return null;
@@ -101,7 +104,8 @@ class SingleTaskController extends AbstractController
      * )
      */
     public function newAction(
-        TranslationTranslatorInterface $translator
+        TranslationTranslatorInterface $translator,
+        Request $request
     ) {
 
       $task = (new SingleTask())
@@ -109,46 +113,41 @@ class SingleTaskController extends AbstractController
           ->setType('task_default')
           ;
         
-        $entityType = $this->getEntityContext();
+        $entityType = $this->getEntityContext($request);
 
         if ($entityType !== null) {
             
-            $entityId = $this->request->query->getInt("{$entityType}_id", 0); // sf4 check:
+            $entityId = $request->query->getInt("{$entityType}_id", 0); // sf4 check:
             // prevent error: `Argument 2 passed to ::getInt() must be of the type int, null given`
 
-            if ($entityId === null) {
-                return new Response("You must provide a {$entityType}_id", Response::HTTP_BAD_REQUEST);
-            }
-
-            if($entityType === 'person')
-            {
-                $person = $this->getDoctrine()->getManager()
-                                ->getRepository(Person::class)
+            switch($entityType){
+                case 'person':
+                    $person = $this->personRepository
                                 ->find($entityId);
 
-                if ($person === null) {
-                    $this->createNotFoundException("Invalid person id");
-                }
+                    if ($person === null) {
+                        $this->createNotFoundException("Invalid person id");
+                    }
 
-                $task->setPerson($person); 
+                    $task->setPerson($person);
+
+                    break;
+                case 'course':
+                    $course = $this->courseRepository
+                    ->find($entityId);
+
+                    if($course === null) {
+                        $this->createNotFoundException("Invalid accompanying course id");
+                    }
+
+                    $task->setCourse($course);
+
+                    break;
+                
+                default:
+                    new Response("You must provide a {$entityType}_id", Response::HTTP_BAD_REQUEST);
+                    break;
             }
-
-            if($entityType === 'course')
-            {
-
-                $course = $this->getDoctrine()->getManager()
-                ->getRepository(AccompanyingPeriod::class)
-                ->find($entityId);
-
-                if($course === null) {
-                    $this->createNotFoundException("Invalid accompanying course id");
-                }
-
-                $task->setCourse($course);
-
-            }
-
-           
         }
 
         //TODO : resolve access rights 
@@ -157,8 +156,7 @@ class SingleTaskController extends AbstractController
         //     . 'allowed to create this task');
 
         $form = $this->setCreateForm($task, new Role(TaskVoter::CREATE));
-
-        $form->handleRequest($this->request);
+        $form->handleRequest($request);
         
         if ($form->isSubmitted()) {
             if ($form->isValid()) {
@@ -171,18 +169,17 @@ class SingleTaskController extends AbstractController
 
                 $this->addFlash('success', $translator->trans("The task is created"));
 
-                if($entityType === 'person')
-                {
-                    return $this->redirectToRoute('chill_task_singletask_list', [
+                switch($entityType){
+                    case 'person':
+                        return $this->redirectToRoute('chill_task_singletask_list', [
                         'person_id' => $task->getPerson()->getId()
-                    ]);
-                }
-
-                if($entityType === 'course')
-                {
-                    return $this->redirectToRoute('chill_task_singletask_courselist', [
+                        ]);
+                        break;
+                    case 'course':
+                        return $this->redirectToRoute('chill_task_singletask_courselist', [
                         'course_id' => $task->getCourse()->getId()
-                    ]);
+                        ]);
+                        break;
                 }
 
             } else {
@@ -190,7 +187,7 @@ class SingleTaskController extends AbstractController
             }
         }
 
-        switch($this->getEntityContext()){
+        switch($this->getEntityContext($request)){
             case 'person': 
                 return $this->render('@ChillTask/SingleTask/Person/new.html.twig', array(
                 'form' => $form->createView(),
@@ -218,8 +215,8 @@ class SingleTaskController extends AbstractController
     public function showAction($id)
     {
         
-        $em = $this->getDoctrine()->getManager();
-        $task = $em->getRepository(SingleTask::class)->find($id);
+        // $em = $this->getDoctrine()->getManager();
+        $task = $this->taskRepository->find($id);
 
         if (!$task) {
             throw $this->createNotFoundException('Unable to find Task entity.');
@@ -227,15 +224,7 @@ class SingleTaskController extends AbstractController
 
         if ($task->getPerson() !== null) {
             
-            $personId = $task->getPerson()->getId();
-
-            if ($personId === null) {
-                return new Response("You must provide a person_id", Response::HTTP_BAD_REQUEST);
-            }
-
-            $person = $this->getDoctrine()->getManager()
-                ->getRepository(Person::class)
-                ->find($personId);
+            $person = $task->getPerson();
 
             if ($person === null) {
                 throw $this->createNotFoundException("Invalid person id");
@@ -250,22 +239,9 @@ class SingleTaskController extends AbstractController
 
         }
 
-        if ($task->getCourse() !== null) 
+        if ($task->getCourse() === null) 
         {
-            $courseId = $task->getCourse()->getId();
-
-            if ($courseId === null) {
-                return new Response("You must provide a course_id", Response::HTTP_BAD_REQUEST);
-            }
-
-            $course = $this->getDoctrine()->getManager()
-            ->getRepository(AccompanyingPeriod::class)
-            ->find($courseId);
-
-            if ($course === null)
-            {
-                throw $this->createNotFoundException("Invalid course id");
-            }
+            return new Response("You must provide a course_id", Response::HTTP_BAD_REQUEST);
         }
 
 
@@ -299,34 +275,23 @@ class SingleTaskController extends AbstractController
      */
     public function editAction(
         $id,
-        TranslationTranslatorInterface $translator
+        TranslationTranslatorInterface $translator,
+        Request $request
     ) {
         
         $em = $this->getDoctrine()->getManager();
         $task = $em->getRepository(SingleTask::class)->find($id);
 
         if ($task->getContext() instanceof Person) {
-            $personId = $task->getPerson()->getId();
-            if ($personId === null) {
+
+            $person = $task->getPerson();
+            if ($person === null) {
                 return new Response("You must provide a person_id", Response::HTTP_BAD_REQUEST);
             }
 
-            $person = $this->getDoctrine()->getManager()
-                ->getRepository(Person::class)
-                ->find($personId);
-
-            if ($person === null) {
-                throw $this->createNotFoundException("Invalid person id");
-            }
         } else {
-            $courseId = $task->getCourse()->getId();
-            if ($courseId === null) {
-                return new Response("You must provide a course_id", Response::HTTP_BAD_REQUEST);
-            }
 
-            $course = $this->getDoctrine()->getManager()
-                ->getRepository(AccompanyingPeriod::class)
-                ->find($courseId);
+            $course = $task->getCourse();
 
             if ($course === null) {
                 throw $this->createNotFoundException("Invalid accompanying period id");
@@ -348,7 +313,7 @@ class SingleTaskController extends AbstractController
         
         $form = $event->getForm();
 
-        $form->handleRequest($this->request);
+        $form->handleRequest($request);
 
         if ($form->isSubmitted()) {
             if ($form->isValid()) {
@@ -370,12 +335,12 @@ class SingleTaskController extends AbstractController
 
                     return $this->redirectToRoute(
                         'chill_task_singletask_list', 
-                        $this->request->query->get('list_params', [])
+                        $request->query->get('list_params', [])
                     );
                 } else {
                     return $this->redirectToRoute(
                         'chill_task_singletask_courselist', 
-                        $this->request->query->get('list_params', [])
+                        $request->query->get('list_params', [])
                     );
                 }
             } else {
@@ -423,9 +388,7 @@ class SingleTaskController extends AbstractController
         $id,
         TranslationTranslatorInterface $translator
     ) {
-    
-        $em = $this->getDoctrine()->getManager();
-        $task = $em->getRepository(SingleTask::class)->find($id);
+        $task = $this->taskRepository->find($id);
 
         if (!$task) {
             throw $this->createNotFoundException('Unable to find Task entity.');
@@ -437,8 +400,7 @@ class SingleTaskController extends AbstractController
                 return new Response("You must provide a person_id", Response::HTTP_BAD_REQUEST);
             }
 
-            $person = $this->getDoctrine()->getManager()
-                ->getRepository(Person::class)
+            $person = $this->personRepository
                 ->find($personId);
 
             if ($person === null) {
@@ -451,8 +413,7 @@ class SingleTaskController extends AbstractController
                 return new Response("You must provide a course_id", Response::HTTP_BAD_REQUEST);
             }
 
-            $course = $this->getDoctrine()->getManager()
-                ->getRepository(AccompanyingPeriod::class)
+            $course = $this->courseRepository
                 ->find($courseId);
 
             if($course === null){
@@ -571,11 +532,12 @@ class SingleTaskController extends AbstractController
      */
     public function listAction(
         PaginatorFactory $paginatorFactory,
-        SingleTaskRepository $taskRepository,
-        PersonRepository $personRepository,
-        AccompanyingPeriodRepository $courseRepository,
-        CenterRepository $centerRepository,
-        FormFactoryInterface $formFactory
+        // SingleTaskRepository $taskRepository,
+        // PersonRepository $personRepository,
+        // AccompanyingPeriodRepository $courseRepository,
+        // CenterRepository $centerRepository,
+        FormFactoryInterface $formFactory,
+        Request $request
     ) {
         /* @var $viewParams array The parameters for the view */
         /* @var $params array The parameters for the query */
@@ -589,10 +551,10 @@ class SingleTaskController extends AbstractController
         $viewParams['accompanyingCourse'] = null;
         $params['accompanyingCourse'] = null;
 
-        if (!empty($this->request->query->get('person_id', NULL))) {
+        if (!empty($request->query->get('person_id', NULL))) {
             
-            $personId = $this->request->query->getInt('person_id', 0);
-            $person = $personRepository->find($personId);
+            $personId = $request->query->getInt('person_id', 0);
+            $person = $this->personRepository->find($personId);
 
             if ($person === null) {
                  throw $this->createNotFoundException("This person ' $personId ' does not exist.");
@@ -603,10 +565,10 @@ class SingleTaskController extends AbstractController
             $params['person'] = $person;
         }
 
-        if (!empty($this->request->query->get('course_id', NULL))) {
+        if (!empty($request->query->get('course_id', NULL))) {
             
-            $courseId = $this->request->query->getInt('course_id', 0);
-            $course = $courseRepository->find($courseId);
+            $courseId = $request->query->getInt('course_id', 0);
+            $course = $this->courseRepository->find($courseId);
 
             if ($course === null) {
                  throw $this->createNotFoundException("This accompanying course ' $courseId ' does not exist.");
@@ -617,27 +579,27 @@ class SingleTaskController extends AbstractController
             $params['accompanyingCourse'] = $course;
         }
         
-        if (!empty($this->request->query->get('center_id', NULL))) {
-            $center = $centerRepository->find($this->request->query->getInt('center_id'));
+        if (!empty($request->query->get('center_id', NULL))) {
+            $center = $this->centerRepository->find($this->request->query->getInt('center_id'));
             if ($center === null) {
                 throw $this->createNotFoundException('center not found');
             }
             $params['center'] = $center;
         }
         
-        if(!empty($this->request->query->get('types', []))) {
+        if(!empty($request->query->get('types', []))) {
             $types = $this->request->query->get('types', []);
             if (count($types) > 0) {
                 $params['types'] = $types;
             }
         }
         
-        if (!empty($this->request->query->get('user_id', null))) {
-            if ($this->request->query->get('user_id') === '_unassigned') {
+        if (!empty($request->query->get('user_id', null))) {
+            if ($request->query->get('user_id') === '_unassigned') {
                 $params['unassigned'] = true;
             } else {
                 
-                $userId = $this->request->query->getInt('user_id', 0);
+                $userId = $request->query->getInt('user_id', 0);
                 $user = $this->getDoctrine()->getManager()
                     ->getRepository(User::class)
                     ->find($userId);
@@ -651,12 +613,11 @@ class SingleTaskController extends AbstractController
             }
         }
 
-        if (!empty($this->request->query->get('scope_id'))) {
+        if (!empty($request->query->get('scope_id'))) {
 
-            $scopeId = $this->request->query->getInt('scope_id', 0);
+            $scopeId = $request->query->getInt('scope_id', 0);
             
-            $scope = $this->getDoctrine()->getManager()
-                ->getRepository(Scope::class)
+            $scope = $this->scopeRepository
                 ->find($scopeId);
 
             if ($scope === null) {
@@ -668,7 +629,7 @@ class SingleTaskController extends AbstractController
         }
 
         $possibleStatuses = \array_merge(SingleTaskRepository::DATE_STATUSES, [ 'closed' ]);
-        $statuses = $this->request->query->get('status', $possibleStatuses);
+        $statuses = $request->query->get('status', $possibleStatuses);
 
         $diff = \array_diff($statuses, $possibleStatuses);
         if (count($diff) > 0) {
@@ -683,7 +644,7 @@ class SingleTaskController extends AbstractController
         $tasks_count = 0;
 
         foreach($statuses as $status) {
-            if($this->request->query->has('status')
+            if($request->query->has('status')
                 && FALSE === \in_array($status, $statuses)) {
                 continue;
             }
@@ -696,14 +657,14 @@ class SingleTaskController extends AbstractController
                 $params['is_closed']   = true;
             }
 
-            $count = $taskRepository
+            $count = $this->taskRepository
                 ->countByParameters($params, $this->getUser())
                 ;
             $paginator = $paginatorFactory->create($count);
 
             $viewParams['single_task_'.$status.'_count'] = $count;
             $viewParams['single_task_'.$status.'_paginator'] = $paginator;
-            $viewParams['single_task_'.$status.'_tasks'] = $taskRepository
+            $viewParams['single_task_'.$status.'_tasks'] = $this->taskRepository
                 ->findByParameters($params, $this->getUser(),
                     $singleStatus ? $paginator->getCurrentPage()->getFirstItemNumber() : 0,
                     $singleStatus ? $paginator->getItemsPerPage() : 10)
@@ -729,7 +690,7 @@ class SingleTaskController extends AbstractController
             'add_type' => true
         ]);
 
-        $form->handleRequest($this->request);
+        $form->handleRequest($request);
     
         if (isset($person)) {
             $event = new PrivacyEvent($person, array(
@@ -744,10 +705,10 @@ class SingleTaskController extends AbstractController
     }
 
 
-    protected function getPersonParam(EntityManagerInterface $em)
+    protected function getPersonParam(Request $request)
     {
-        $person = $em->getRepository(Person::class)
-            ->find($this->request->query->getInt('person_id'))
+        $person = $this->personRepository
+            ->find($request->query->getInt('person_id'))
             ;
 
         if (NULL === $person) {
@@ -760,10 +721,10 @@ class SingleTaskController extends AbstractController
         return $person;
     }
 
-    protected function getUserParam(EntityManagerInterface $em)
+    protected function getUserParam(Request $request)
     {
-        $user = $em->getRepository(User::class)
-            ->find($this->request->query->getInt('user_id'))
+        $user = $this->userRepository
+            ->find($request->query->getInt('user_id'))
             ;
 
         if (NULL === $user) {
@@ -799,17 +760,16 @@ class SingleTaskController extends AbstractController
      */
 
     public function listCourseTasks(
-        AccompanyingPeriodRepository $courseRepository, 
-        SingleTaskRepository $taskRepository,
         FormFactoryInterface $formFactory,
-        TranslationTranslatorInterface $translator
+        TranslationTranslatorInterface $translator,
+        Request $request
         ): Response
     {
 
-        if (!empty($this->request->query->get('course_id', NULL))) {
+        if (!empty($request->query->get('course_id', NULL))) {
             
-            $courseId = $this->request->query->getInt('course_id', 0);
-            $course = $courseRepository->find($courseId);
+            $courseId = $request->query->getInt('course_id', 0);
+            $course = $this->courseRepository->find($courseId);
 
             if ($course === null) {
                  throw $this->createNotFoundException("This accompanying course ' $courseId ' does not exist.");
@@ -817,13 +777,11 @@ class SingleTaskController extends AbstractController
 
         }
 
-        $em = $this->getDoctrine()->getManager();
-
         if($course === NULL) {
             throw $this->createNotFoundException('Accompanying course not found');
         }
 
-        $tasks = $taskRepository
+        $tasks = $this->taskRepository
         ->findBy(
             array('course' => $course)
         );
diff --git a/src/Bundle/ChillTaskBundle/config/services/controller.yaml b/src/Bundle/ChillTaskBundle/config/services/controller.yaml
index cfe083e07..80b8c0b08 100644
--- a/src/Bundle/ChillTaskBundle/config/services/controller.yaml
+++ b/src/Bundle/ChillTaskBundle/config/services/controller.yaml
@@ -8,5 +8,5 @@ services:
       $eventDispatcher: '@Symfony\Component\EventDispatcher\EventDispatcherInterface'
       $timelineBuilder: "@chill_main.timeline_builder"
       $logger: "@chill.main.logger"
-      $requestStack: '@Symfony\Component\HttpFoundation\RequestStack'
+      $em: "@doctrine.orm.default_entity_manager"
     tags: ["controller.service_arguments"]
diff --git a/src/Bundle/ChillTaskBundle/migrations/Version20210909153533.php b/src/Bundle/ChillTaskBundle/migrations/Version20210909153533.php
index 8a81b4ab9..5ea1bb32c 100644
--- a/src/Bundle/ChillTaskBundle/migrations/Version20210909153533.php
+++ b/src/Bundle/ChillTaskBundle/migrations/Version20210909153533.php
@@ -7,14 +7,11 @@ namespace Chill\Migrations\Task;
 use Doctrine\DBAL\Schema\Schema;
 use Doctrine\Migrations\AbstractMigration;
 
-/**
- * Auto-generated Migration: Please modify to your needs!
- */
 final class Version20210909153533 extends AbstractMigration
 {
     public function getDescription(): string
     {
-        return '';
+        return 'An accompanying period can be linked to a task. Key course_id is added to single task entity';
     }
 
     public function up(Schema $schema): void