When topic is deleted, discussions are purged

CHANGELOG.md

@@ -10,6 +10,7 @@
   - Defining a contact point for a dataset is done throught a form field
 - Allow wildcards in redirect_uris for Oauth2Client [#2935](https://github.com/opendatateam/udata/pull/2935)
 - Allow for being one day late on update fulfilled in time [#2941](https://github.com/opendatateam/udata/pull/2941)
+- When a topic is deleted, corresponding discussions are purged [#2944](https://github.com/opendatateam/udata/pull/2944)
 
 ## 7.0.1 (2023-12-06)
 

udata/core/topic/api.py

@@ -1,5 +1,6 @@
 from udata.api import api, fields, API
 from udata.core.dataset.api_fields import dataset_fields
+from udata.core.discussions.models import Discussion
 from udata.core.organization.api_fields import org_ref_fields
 from udata.core.reuse.api_fields import reuse_fields
 from udata.core.topic.permissions import TopicEditPermission
@@ -121,5 +122,7 @@ def delete(self, topic):
         '''Delete a given topic'''
         if not TopicEditPermission(topic).can():
             api.abort(403, 'Forbidden')
+        # Remove discussions linked to the topic
+        Discussion.objects(subject=topic).delete()
         topic.delete()
         return '', 204

udata/tests/api/test_topics_api.py

@@ -4,7 +4,7 @@
 from udata.core.topic.models import Topic
 from udata.core.topic.factories import TopicFactory
 from udata.core.user.factories import UserFactory
-from udata.models import Member
+from udata.models import Member, Discussion
 
 from . import APITestCase
 
@@ -122,10 +122,27 @@ def test_topic_api_delete(self):
         '''It should delete a topic from the API'''
         owner = self.login()
         topic = TopicFactory(owner=owner)
+
+        with self.api_user():
+            response = self.post(url_for('api.discussions'), {
+                'title': 'test title',
+                'comment': 'bla bla',
+                'subject': {
+                    'class': 'Topic',
+                    'id': topic.id,
+                }
+            })
+        self.assert201(response)
+
+        discussions = Discussion.objects(subject=topic)
+        self.assertEqual(len(discussions), 1)
+
         with self.api_user():
             response = self.delete(url_for('api.topic', topic=topic))
         self.assertStatus(response, 204)
+
         self.assertEqual(Topic.objects.count(), 0)
+        self.assertEqual(Discussion.objects.count(), 0)
 
     def test_topic_api_delete_perm(self):
         '''It should not delete a topic from the API'''