add a redirct view mixin

generic/views.py

@@ -1515,6 +1515,8 @@ class ExamViews(View, LoginRequiredMixin):
         ):
             view_feedback = True
 
+        can_edit = question.can_edit(request.user)
+
         return render(
             request,
             "{}/question_detail.html".format(self.app_name),
@@ -1526,6 +1528,7 @@ class ExamViews(View, LoginRequiredMixin):
                 "exam_length": exam_length,
                 "pos": pos,
                 "view_feedback": view_feedback,
+                "can_edit": can_edit,
             },
         )
 
@@ -3512,4 +3515,22 @@ class ExamGroupsUpdateBase(
     def get_form_kwargs(self):
         kwargs = super(ExamGroupsUpdateBase, self).get_form_kwargs()
         kwargs.update({"user": self.request.user})
-        return kwargs
+        return kwargs
+
+class RedirectMixin():
+    def get_success_url(self) -> str:
+        if "redirect" in self.request.GET:
+            return self.request.GET["redirect"]
+        return super().get_success_url()
+
+class UpdateQuestionMixin(RedirectMixin, RevisionMixin, UpdateView):
+
+    def get_form_kwargs(self):
+        kwargs = super().get_form_kwargs()
+        kwargs.update({"user": self.request.user})
+        return kwargs
+
+    def get_context_data(self, **kwargs):
+        context = super().get_context_data(**kwargs)
+        context["question"] = context["object"]
+        return context