From 9eec2404ddcc47a27a23b091f6abc22523f2b4ab Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Norman=20J=C3=A4ckel?= <openslides@normanjaeckel.de>
Date: Fri, 1 Mar 2019 20:51:42 +0100
Subject: [PATCH] Fixed on_delete field attr. Fixed #4405

---
 openslides/utils/models.py                | 26 ++++++--------
 tests/integration/motions/test_viewset.py | 42 +++++++++++++++++++++++
 2 files changed, 53 insertions(+), 15 deletions(-)

diff --git a/openslides/utils/models.py b/openslides/utils/models.py
index d997ed2aa..e106e47d1 100644
--- a/openslides/utils/models.py
+++ b/openslides/utils/models.py
@@ -163,12 +163,11 @@ def SET_NULL_AND_AUTOUPDATE(
     Like models.SET_NULL but also informs the autoupdate system about the
     instance that was reference.
     """
-    if len(sub_objs) != 1:
-        raise RuntimeError(
-            "SET_NULL_AND_AUTOUPDATE is used in an invalid usecase. Please report the bug!"
-        )
-    setattr(sub_objs[0], field.name, None)
-    inform_changed_data(sub_objs[0])
+    instances = []
+    for sub_obj in sub_objs:
+        setattr(sub_obj, field.name, None)
+        instances.append(sub_obj)
+    inform_changed_data(instances)
     models.SET_NULL(collector, field, sub_objs, using)
 
 
@@ -179,19 +178,16 @@ def CASCADE_AND_AUTOUODATE(
     Like models.CASCADE but also informs the autoupdate system about the
     root rest element of the also deleted instance.
     """
-    if len(sub_objs) != 1:
-        raise RuntimeError(
-            "CASCADE_AND_AUTOUPDATE is used in an invalid usecase. Please report the bug!"
-        )
-    root_rest_element = sub_objs[0].get_root_rest_element()
-    inform_changed_elements(
-        [
+    elements = []
+    for sub_obj in sub_objs:
+        root_rest_element = sub_obj.get_root_rest_element()
+        elements.append(
             Element(
                 collection_string=root_rest_element.get_collection_string(),
                 id=root_rest_element.pk,
                 full_data=None,
                 reload=True,
             )
-        ]
-    )
+        )
+    inform_changed_elements(elements)
     models.CASCADE(collector, field, sub_objs, using)
diff --git a/tests/integration/motions/test_viewset.py b/tests/integration/motions/test_viewset.py
index f737da93f..4417e4e0b 100644
--- a/tests/integration/motions/test_viewset.py
+++ b/tests/integration/motions/test_viewset.py
@@ -696,6 +696,18 @@ class DeleteMotion(TestCase):
         motions = Motion.objects.count()
         self.assertEqual(motions, 0)
 
+    def test_delete_with_two_change_recommendations(self):
+        self.cr1 = MotionChangeRecommendation.objects.create(
+            motion=self.motion, internal=False, line_from=1, line_to=1
+        )
+        self.cr2 = MotionChangeRecommendation.objects.create(
+            motion=self.motion, internal=False, line_from=2, line_to=2
+        )
+        response = self.client.delete(reverse("motion-detail", args=[self.motion.pk]))
+        self.assertEqual(response.status_code, status.HTTP_204_NO_CONTENT)
+        motions = Motion.objects.count()
+        self.assertEqual(motions, 0)
+
 
 class ManageMultipleSubmitters(TestCase):
     """
@@ -1966,3 +1978,33 @@ class DeleteWorkflow(TestCase):
         )
         self.assertEqual(response.status_code, status.HTTP_400_BAD_REQUEST)
         self.assertEqual(Workflow.objects.count(), 2)
+
+
+class DeleteCategory(TestCase):
+    """
+    Tests the deletion of categories.
+    """
+
+    def setUp(self):
+        self.client = APIClient()
+        self.client.login(username="admin", password="admin")
+        self.category = Category.objects.create(
+            name="test_name_dacei2iiTh", prefix="test_prefix_lahngoaW9L"
+        )
+
+    def test_simple_delete_category_with_two_motions(self):
+        self.motion1 = Motion.objects.create(
+            title="test_title_fieB5ko4ahGeex5ohsh7",
+            text="test_text_EFoh6Ahtho9eihei1xua",
+            category=self.category,
+        )
+        self.motion2 = Motion.objects.create(
+            title="test_title_ahboo8eerohchuoD7sut",
+            text="test_text_pahghah9iuM9moo8Ohve",
+            category=self.category,
+        )
+        response = self.client.delete(
+            reverse("category-detail", args=[self.category.pk])
+        )
+        self.assertEqual(response.status_code, status.HTTP_204_NO_CONTENT)
+        self.assertFalse(Category.objects.exists())