improve exam collections management

generic/views.py

@@ -759,24 +759,36 @@ class ExamViews(View, LoginRequiredMixin):
         return HttpResponse("Done")
 
     @method_decorator(login_required)
-    def exam_list(self, request, all=False):
-        if not self.check_user_access(request.user):
-            # raise PermissionDenied
-            exam_list = self.Exam.objects.filter(
-                author__id=request.user.id, exam_mode=True
-            ).order_by("name")
+    def exam_list_collection(self, request, collection_id):
+        collection = get_object_or_404(ExamCollection, pk=collection_id)
 
-            exam_list = exam_list | self.Exam.objects.filter(
-                markers__id=request.user.id, exam_mode=True
-            ).order_by("name")
-        else:
-            exam_list = (
-                self.Exam.objects.prefetch_related(
-                    "valid_user_users", "valid_cid_users"
+        if not request.user in collection.author.all():
+            raise PermissionDenied
+
+        return self.exam_list(request, all=True, collection=collection)
+
+    @method_decorator(login_required)
+    def exam_list(self, request, all=False, collection=None):
+        if collection is None:
+            if not self.check_user_access(request.user):
+                # raise PermissionDenied
+                exam_list = self.Exam.objects.filter(
+                    author__id=request.user.id, exam_mode=True
+                ).order_by("name")
+
+                exam_list = exam_list | self.Exam.objects.filter(
+                    markers__id=request.user.id, exam_mode=True
+                ).order_by("name")
+            else:
+                exam_list = (
+                    self.Exam.objects.prefetch_related(
+                        "valid_user_users", "valid_cid_users"
+                    )
+                    .filter(exam_mode=True)
+                    .order_by("name")
                 )
-                .filter(exam_mode=True)
-                .order_by("name")
-            )
+        else:
+            exam_list = self.Exam.objects.filter(exam_mode=True, examcollection__in=[collection]).order_by("name")
 
         if not all:
             exam_list = exam_list.filter(archive=False).order_by("name")
@@ -794,6 +806,7 @@ class ExamViews(View, LoginRequiredMixin):
                 "app_name": self.app_name,
                 "view_all": all,
                 "marking": marking,
+                "collection": collection,
             },
         )