fix a little question ordering bug

longs/views.py

@@ -129,9 +129,9 @@ class AuthorOrCheckerRequiredMixin(object):
             or self.request.user.is_superuser
         ):
             return obj
-        if self.request.user not in obj.get_author_objects():
-            raise PermissionDenied()  # or Http404
-        return obj
+        if self.request.user in obj.get_author_objects():
+            return obj
+        raise PermissionDenied()  # or Http404
 
 
 # def index(request):
@@ -959,7 +959,7 @@ class ExamCreate(ExamCreateBase):
     form_class = ExamForm
 
 
-class ExamUpdate(ExamUpdateBase, AuthorOrCheckerRequiredMixin):
+class ExamUpdate(AuthorOrCheckerRequiredMixin, ExamUpdateBase):
     model = Exam
     form_class = ExamForm