diff --git a/rest_framework/validators.py b/rest_framework/validators.py
index a21f67e60e..83ad6f7d8e 100644
--- a/rest_framework/validators.py
+++ b/rest_framework/validators.py
@@ -35,7 +35,7 @@ def set_context(self, serializer_field):
"""
# Determine the underlying model field name. This may not be the
# same as the serializer field name if `source=<>` is set.
- self.field_name = serializer_field.source_attrs[0]
+ self.field_name = serializer_field.source_attrs[-1]
# Determine the existing instance, if this is an update operation.
self.instance = getattr(serializer_field.parent, 'instance', None)
@@ -174,8 +174,8 @@ def set_context(self, serializer):
"""
# Determine the underlying model field names. These may not be the
# same as the serializer field names if `source=<>` is set.
- self.field_name = serializer.fields[self.field].source_attrs[0]
- self.date_field_name = serializer.fields[self.date_field].source_attrs[0]
+ self.field_name = serializer.fields[self.field].source_attrs[-1]
+ self.date_field_name = serializer.fields[self.date_field].source_attrs[-1]
# Determine the existing instance, if this is an update operation.
self.instance = getattr(serializer, 'instance', None)
diff --git a/tests/test_validators.py b/tests/test_validators.py
index acaaf57432..67156f31c7 100644
--- a/tests/test_validators.py
+++ b/tests/test_validators.py
@@ -4,6 +4,7 @@
from django.test import TestCase
from rest_framework import serializers
+from rest_framework.validators import UniqueValidator
def dedent(blocktext):
@@ -22,6 +23,20 @@ class Meta:
model = UniquenessModel
+class RelatedModel(models.Model):
+ user = models.OneToOneField(UniquenessModel, on_delete=models.CASCADE)
+ email = models.CharField(unique=True, max_length=80)
+
+
+class RelatedModelSerializer(serializers.ModelSerializer):
+ username = serializers.CharField(source='user.username',
+ validators=[UniqueValidator(queryset=UniquenessModel.objects.all())]) # NOQA
+
+ class Meta:
+ model = RelatedModel
+ fields = ('username', 'email')
+
+
class AnotherUniquenessModel(models.Model):
code = models.IntegerField(unique=True)
@@ -73,6 +88,16 @@ def test_doesnt_pollute_model(self):
self.assertEqual(
AnotherUniquenessModel._meta.get_field('code').validators, [])
+ def test_related_model_is_unique(self):
+ data = {'username': 'existing', 'email': 'new-email@example.com'}
+ rs = RelatedModelSerializer(data=data)
+ self.assertFalse(rs.is_valid())
+ self.assertEqual(rs.errors,
+ {'username': ['This field must be unique.']})
+ data = {'username': 'new-username', 'email': 'new-email@example.com'}
+ rs = RelatedModelSerializer(data=data)
+ self.assertTrue(rs.is_valid())
+
# Tests for `UniqueTogetherValidator`
# -----------------------------------
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