start taking more advantage of class based views

physics/views.py

@@ -3,7 +3,7 @@ from django.utils import timezone
 from generic.models import CidUser
 from physics.decorators import user_is_author_or_physics_checker
 from physics.filters import QuestionFilter, UserAnswerFilter
-from generic.mixins import SuperuserRequiredMixin
+from generic.mixins import CheckCanEditMixin, SuperuserRequiredMixin
 from physics.tables import QuestionTable, UserAnswerTable
 from django.shortcuts import render, get_object_or_404, redirect
 from django.views.decorators.csrf import csrf_exempt
@@ -339,7 +339,7 @@ class ExamCreate(ExamCreateBase):
     form_class = ExamForm
 
 
-class ExamUpdate(ExamUpdateBase, AuthorOrCheckerRequiredMixin):
+class ExamUpdate(CheckCanEditMixin, ExamUpdateBase, AuthorOrCheckerRequiredMixin):
     model = Exam
     form_class = ExamForm
 
@@ -353,10 +353,11 @@ class ExamClone(AuthorOrCheckerRequiredMixin, ExamCloneMixin, ExamCreate):
 
 
 class ExamAuthorUpdate(
-    RevisionMixin, LoginRequiredMixin, AuthorRequiredMixin, UpdateView
+    RevisionMixin, CheckCanEditMixin, LoginRequiredMixin, AuthorRequiredMixin, UpdateView
 ):
     model = Exam
     form_class = ExamAuthorForm
+    template_name = "author_form.html"
 
 
 class QuestionView(