Fixed #30798 -- Fixed Meta.ordering validation for pk of related fields.

Regression in 440505cb2cadbe1a5b9fba246bcde6c04f51d07e.

1 files changed, 5 insertions, 1 deletions

diff --git a/django/db/models/base.py b/django/db/models/base.py
index fe3d84677a..0b8425aa85 100644
--- a/django/db/models/base.py
+++ b/django/db/models/base.py
@@ -1708,7 +1708,11 @@ class Model(metaclass=ModelBase):
             fld = None
             for part in field.split(LOOKUP_SEP):
                 try:
-                    fld = _cls._meta.get_field(part)
+                    # pk is an alias that won't be found by opts.get_field.
+                    if part == 'pk':
+                        fld = _cls._meta.pk
+                    else:
+                        fld = _cls._meta.get_field(part)
                     if fld.is_relation:
                         _cls = fld.get_path_info()[-1].to_opts.model
                     else: