Cache the results of ItemDelete.get_answer_options

Fix #911

openslides/agenda/views.py

@@ -246,12 +246,25 @@ class ItemDelete(DeleteView):
     url_name_args = []
 
     def get_answer_options(self):
+        """
+        Returns the possible answers to the delete view.
+
+        'all' is a possible answer, when the item has children.
+        """
+        # Cache the result in the request, so when the children are deleted, the
+        # result does not change
+        try:
+            options = self.item_delete_answer_options
+        except AttributeError:
             if self.object.children.exists():
-            return [('all', _("Yes, with all child items."))] + self.answer_options
+                options = [('all', _("Yes, with all child items."))] + self.answer_options
             else:
-            return self.answer_options
+                options = self.answer_options
+            self.item_delete_answer_options = options
+        return options
 
     def pre_post_redirect(self, request, *args, **kwargs):
+        # TODO: rewrite this method with on_case_all and on_case_yes
         if self.get_answer() == 'all':
             self.object.delete(with_children=True)
             messages.success(

tests/agenda/tests.py

@@ -214,6 +214,14 @@ class ViewTest(TestCase):
         self.assertRedirects(response, '/agenda/')
         self.assertFalse(Item.objects.filter(pk=1).exists())
 
+    def test_delete_item_with_children(self):
+        item1 = Item.objects.create(title='item1')
+        item2 = Item.objects.create(title='item2', parent=item1)
+
+        self.adminClient.post('/agenda/%d/del/' % item1.pk, {'all': 'all'})
+        query = Item.objects.filter(pk__in=[item1.pk, item2.pk])
+        self.assertFalse(query)
+
 
 class ConfigTest(TestCase):
     def setUp(self):