From ea44b6703b3e2cd9782cebd217ce9c7626ee9d01 Mon Sep 17 00:00:00 2001
From: Sergei Aleshin <byword_roads_0h@icloud.com>
Date: Wed, 1 Oct 2025 20:31:15 +0400
Subject: [PATCH] fix: order of model classes in the
 unique_constraint_by_fields

---
 rest_framework/serializers.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/rest_framework/serializers.py b/rest_framework/serializers.py
index de737fc3b..5ca1ad55f 100644
--- a/rest_framework/serializers.py
+++ b/rest_framework/serializers.py
@@ -1608,7 +1608,7 @@ class ModelSerializer(Serializer):
 
         unique_constraint_by_fields = {
             constraint.fields: constraint
-            for model_cls in (self.Meta.model, *self.Meta.model._meta.parents)
+            for model_cls in (*self.Meta.model._meta.parents, self.Meta.model)
             for constraint in model_cls._meta.constraints
             if isinstance(constraint, models.UniqueConstraint)
         }