Ticket #18682: django_fix_18682.patch

django/contrib/contenttypes/management.py

@@ -61 +61 @@
     # Confirm that the content type is stale before deletion.
     if to_remove:
         if interactive:
-            content_type_display = '\n'.join(
-                '    %s | %s' % (ct.app_label, ct.model)
-                for ct in to_remove
-            )
+            ct_info = []
+            for ct in to_remove:
+                relations = ct._meta.get_all_related_objects()
+                related_counts = {}
+
+                ct_info.append('    %s | %s' % (ct.app_label, ct.model))
+
+                for rel in relations:
+                    # Ignore non-ContentType relations
+                    if rel.parent_model != ContentType:
+                        continue
+
+                    accessor = getattr(ct, rel.get_accessor_name(), None)
+
+                    if not accessor:
+                        continue
+
+                    filter_kwargs = {
+                        rel.field.name: ct
+                    }
+                    related_count =  accessor.filter(**filter_kwargs).count()
+                    if related_count > 0:
+                        ct_info.append('      - %s | %s object%s to be deleted: %d' % (
+                            rel.opts.app_label,
+                            rel.opts.model_name,
+                            's' if related_count != 1 else '',
+                            related_count)
+                        )
+
+            content_type_display = '\n'.join(ct_info)
             ok_to_delete = input("""The following content types are stale and need to be deleted:
 
 %s