Ticket #16208: 16208.patch

django/core/serializers/python.py

@@ -110 +110 @@
                     if hasattr(field.rel.to._default_manager, 'get_by_natural_key'):
                         if hasattr(field_value, '__iter__'):
                             obj = field.rel.to._default_manager.db_manager(db).get_by_natural_key(*field_value)
-                            value = getattr(obj, field.rel.field_name)
-                            # If this is a natural foreign key to an object that
-                            # has a FK/O2O as the foreign key, use the FK value
-                            if field.rel.to._meta.pk.rel:
-                                value = value.pk
                         else:
-                            value = field.rel.to._meta.get_field(field.rel.field_name).to_python(field_value)
+                            obj = field.rel.to._default_manager.db_manager(db).get_by_natural_key(field_value)
+                        value = getattr(obj, field.rel.field_name)
+                        # If this is a natural foreign key to an object that
+                        # has a FK/O2O as the foreign key, use the FK value
+                        if field.rel.to._meta.pk.rel:
+                            value = value.pk
                         data[field.attname] = value
                     else:
                         data[field.attname] = field.rel.to._meta.get_field(field.rel.field_name).to_python(field_value)