Improved nested update test in update().

Closes #2194.
encode · Dec 3, 2014 · f2dd05a · f2dd05a
1 parent 71a8cb2
commit f2dd05a
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/rest_framework/serializers.py b/rest_framework/serializers.py
@@ -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.values()
         ), (
             'The `.update()` method does not suport nested writable fields '
             'by default. Write an explicit `.update()` method for serializer '