Fixed #36730 -- Fixed constraint validation crash for excluded FK attnames.

Regression in e44e8327d3d88d86895735c0e427102063ff5b55.

Co-authored-by: Mariusz Felisiak <felisiak.mariusz@gmail.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/django/db/models/constraints.py b/django/db/models/constraints.py
index 73ab23bdfa..93251ff322 100644
--- a/django/db/models/constraints.py
+++ b/django/db/models/constraints.py
@@ -51,9 +51,12 @@ class BaseConstraint:
     def _expression_refs_exclude(cls, model, expression, exclude):
         get_field = model._meta.get_field
         for field_name, *__ in model._get_expr_references(expression):
-            if field_name in exclude:
+            if field_name == "pk":
+                field = model._meta.pk
+            else:
+                field = get_field(field_name)
+            if field_name in exclude or field.name in exclude:
                 return True
-            field = get_field(field_name)
             if field.generated and cls._expression_refs_exclude(
                 model, field.expression, exclude
             ):