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-rw-r--r--rest_framework/serializers.py4
1 files changed, 2 insertions, 2 deletions
diff --git a/rest_framework/serializers.py b/rest_framework/serializers.py
index d417ca80..b1175b5b 100644
--- a/rest_framework/serializers.py
+++ b/rest_framework/serializers.py
@@ -681,8 +681,8 @@ class ModelSerializer(Serializer):
def update(self, instance, validated_attrs):
assert not any(
- isinstance(field, BaseSerializer) and not field.read_only
- for field in self.fields.values()
+ isinstance(field, BaseSerializer) and (key in validated_attrs)
+ for key, field in self.fields.values()
), (
'The `.update()` method does not suport nested writable fields '
'by default. Write an explicit `.update()` method for serializer '