Fixed #29076 -- Made Model.refresh_from_db() clear cached relationships even if the related id doesn't change.

1 files changed, 2 insertions, 6 deletions

diff --git a/django/db/models/base.py b/django/db/models/base.py
index f88690f225..8d4e19fa5a 100644
--- a/django/db/models/base.py
+++ b/django/db/models/base.py
@@ -609,13 +609,9 @@ class Model(metaclass=ModelBase):
                 # This field wasn't refreshed - skip ahead.
                 continue
             setattr(self, field.attname, getattr(db_instance, field.attname))
-            # Throw away stale foreign key references.
+            # Clear cached foreign keys.
             if field.is_relation and field.is_cached(self):
-                rel_instance = field.get_cached_value(self)
-                local_val = getattr(db_instance, field.attname)
-                related_val = None if rel_instance is None else getattr(rel_instance, field.target_field.attname)
-                if local_val != related_val or (local_val is None and related_val is None):
-                    field.delete_cached_value(self)
+                field.delete_cached_value(self)
 
         # Clear cached relations.
         for field in self._meta.related_objects: