Fixed #37139 -- Fixed inlines crash on parent models with db_default on primary key.

1 files changed, 10 insertions, 2 deletions

diff --git a/django/db/models/base.py b/django/db/models/base.py
index d53da600d7..7ac02f8a50 100644
--- a/django/db/models/base.py
+++ b/django/db/models/base.py
@@ -709,9 +709,17 @@ class Model(AltersData, metaclass=ModelBase):
 
     def _is_pk_set(self, meta=None):
         pk_val = self._get_pk_val(meta)
+
+        def _is_set(value):
+            return (
+                value is None
+                # Empty value when db_default is used.
+                or isinstance(value, DatabaseDefault)
+            )
+
         return not (
-            pk_val is None
-            or (isinstance(pk_val, tuple) and any(f is None for f in pk_val))
+            _is_set(pk_val)
+            or (isinstance(pk_val, tuple) and any(_is_set(f) for f in pk_val))
         )
 
     def get_deferred_fields(self):