Revoke all existing requests when you upload a new file to mass enqueue people

src/main/java/nl/tudelft/ewi/queue/controller/CourseController.java

@@ -13,6 +13,7 @@ import nl.tudelft.ewi.queue.repository.UserRepository;
 import nl.tudelft.ewi.queue.service.CourseService;
 import nl.tudelft.ewi.queue.service.GroupService;
 import nl.tudelft.ewi.queue.service.LabService;
+import nl.tudelft.ewi.queue.service.RequestService;
 import nl.tudelft.ewi.queue.validator.ParticipantValidator;
 import nl.tudelft.ewi.queue.viewmodel.AssignmentViewModel;
 import org.bouncycastle.ocsp.Req;
@@ -49,6 +50,9 @@ import java.util.stream.Collectors;
 @Controller
 public class CourseController {
 
+    @Autowired
+    private RequestService requestService;
+
     private static final Logger logger = LoggerFactory.getLogger(CourseController.class);
 
     @Autowired
@@ -315,6 +319,12 @@ public class CourseController {
 
         Assignment assignment = assignmentRepository.findOne(assignmentId);
 
+        for(Lab lab : assignment.getLabs()){
+            for(Request req : lab.getPending()) {
+                requestService.revoke(req);
+            }
+        }
+
         for(RequestEntity user : users) {
             labService.randomEnqueue(assignment, user);
         }