diff --git a/rest_framework/validators.py b/rest_framework/validators.py
index a152c6362f..4c444cf01e 100644
--- a/rest_framework/validators.py
+++ b/rest_framework/validators.py
@@ -188,7 +188,8 @@ def __call__(self, attrs, serializer):
if attrs[field_name] != getattr(serializer.instance, field_name)
]
- condition_kwargs = {source: attrs[source] for source in self.condition_fields}
+ condition_sources = (serializer.fields[field_name].source for field_name in self.condition_fields)
+ condition_kwargs = {source: attrs[source] for source in condition_sources}
if checked_values and None not in checked_values and qs_exists_with_condition(queryset, self.condition, condition_kwargs):
field_names = ', '.join(self.fields)
message = self.message.format(field_names=field_names)
diff --git a/tests/test_validators.py b/tests/test_validators.py
index 29b097ef39..d19734d98c 100644
--- a/tests/test_validators.py
+++ b/tests/test_validators.py
@@ -683,6 +683,24 @@ def test_nullable_unique_constraint_fields_are_not_required(self):
result = serializer.save()
self.assertIsInstance(result, UniqueConstraintNullableModel)
+ def test_unique_constraint_source(self):
+ class SourceUniqueConstraintSerializer(serializers.ModelSerializer):
+ raceName = serializers.CharField(source="race_name")
+
+ class Meta:
+ model = UniqueConstraintModel
+ fields = ("raceName", "position", "global_id", "fancy_conditions")
+
+ serializer = SourceUniqueConstraintSerializer(
+ data={
+ "raceName": "example",
+ "position": 5,
+ "global_id": 11,
+ "fancy_conditions": 11,
+ }
+ )
+ assert serializer.is_valid()
+
# Tests for `UniqueForDateValidator`
# ----------------------------------
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