fix: cascade delete versions when corresponding change request is del…

…eted (#4152)

api/features/versioning/migrations/0003_cascade_delete_versions_on_cr_delete.py

@@ -0,0 +1,20 @@
+# Generated by Django 3.2.25 on 2024-06-12 14:43
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('workflows_core', '0009_prevent_cascade_delete_from_user_delete'),
+        ('feature_versioning', '0002_add_api_key_for_creation_and_publish'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='environmentfeatureversion',
+            name='change_request',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.CASCADE, related_name='environment_feature_versions', to='workflows_core.changerequest'),
+        ),
+    ]

api/features/versioning/models.py

@@ -74,7 +74,7 @@ class EnvironmentFeatureVersion(
     change_request = models.ForeignKey(
         "workflows_core.ChangeRequest",
         related_name="environment_feature_versions",
-        on_delete=models.SET_NULL,
+        on_delete=models.CASCADE,
         null=True,
         blank=True,
     )