Add "Mark all as read"

core/views/site.py

@@ -21,6 +21,8 @@ class NotificationList(ListView):
     template_name = "core/notification_list.jinja"
 
     def get_queryset(self):
+        if 'see_all' in self.request.GET.keys():
+            self.request.user.notifications.update(viewed=True)
         return self.request.user.notifications.order_by('-id')[:20]
 
 def notification(request, notif_id):