dav_events/views/events.py

@@ -688,6 +688,31 @@ class EventCreateView(EventPermissionMixin, generic.FormView):
             return self.render_to_response(self.get_context_data(form=next_form, event=event))
         else:
             event.editor = self.request.user
+
+            # Check for double submission (seems to happens accidentally if smartphone user reload the submit page)
+            possible_doublets = models.Event.objects.filter(owner=event.editor,
+                                                            title=event.title,
+                                                            first_day=event.first_day)
+            if possible_doublets.exists():
+                accident_period = datetime.datetime.now() - datetime.timedelta(hours=24)
+                possible_doublets = possible_doublets.filter(created_at__gt=accident_period)
+                if possible_doublets.exists():
+                    doublet = possible_doublets.first()
+                    doublet_created_at = doublet.created_at.strftime('%d.%m.%Y %H:%M:%S')
+                    error_msg = _(u'Du hast bereits eine Veranstaltung'
+                                  u' mit dem Titel "%(title)s"'
+                                  u' für das Datum %(day)s angelegt'
+                                  u' (am %(created_at)s).') % {'title': event.title,
+                                                               'day': event.first_day,
+                                                               'created_at': doublet_created_at}
+                    warn_msg = _(u'Deine eingegebenen Daten sind noch da,'
+                                 u' wenn du jetzt auf "Neue Veranstaltung anlegen" klickst.'
+                                 u' Du musst aber entweder den Titel oder das Startdatum ändern,'
+                                 u' um die Veranstaltung anlegen zu können.')
+                    messages.error(self.request, error_msg)
+                    messages.warning(self.request, warn_msg)
+                    return HttpResponseRedirect(reverse('dav_events:list'))
+
             event.save()
             if 'submit' in form.data:
                 event.workflow.update_status('submitted', event.owner)