diff --git a/rest_framework/serializers.py b/rest_framework/serializers.py
index d417ca8067..c7f04b40cc 100644
--- a/rest_framework/serializers.py
+++ b/rest_framework/serializers.py
@@ -633,8 +633,8 @@ def create(self, validated_attrs):
# If we don't do this explicitly they'd likely get a confusing
# error at the point of calling `Model.objects.create()`.
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.items()
), (
'The `.create()` method does not suport nested writable fields '
'by default. Write an explicit `.create()` method for serializer '
@@ -681,8 +681,8 @@ def create(self, validated_attrs):
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.items()
), (
'The `.update()` method does not suport nested writable fields '
'by default. Write an explicit `.update()` method for serializer '
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