Fixed #24607 -- Serialized natural keys in multi-table inheritance models.

1 files changed, 7 insertions, 1 deletions

diff --git a/django/core/serializers/base.py b/django/core/serializers/base.py
index a6c8847278..cc3d94e155 100644
--- a/django/core/serializers/base.py
+++ b/django/core/serializers/base.py
@@ -88,7 +88,7 @@ class Serializer(object):
                         if self.selected_fields is None or field.attname in self.selected_fields:
                             self.handle_field(obj, field)
                     else:
-                        if self.selected_fields is None or field.attname[:-3] in self.selected_fields:
+                        if self.field_is_selected(field) and self.output_pk_field(obj, field):
                             self.handle_fk_field(obj, field)
             for field in concrete_model._meta.many_to_many:
                 if field.serialize:
@@ -101,6 +101,12 @@ class Serializer(object):
         self.end_serialization()
         return self.getvalue()
 
+    def field_is_selected(self, field):
+        return self.selected_fields is None or field.attname[:-3] in self.selected_fields
+
+    def output_pk_field(self, obj, pk_field):
+        return self.use_natural_primary_keys or pk_field != obj._meta.pk
+
     def start_serialization(self):
         """
         Called when serializing of the queryset starts.