I have added serializer_class = serializers.FavoriteListSerializer to the ViewSet, now instead of getting This field is required, which I think got past the validation but then I am getting This field cannot be null. How to take slice of string when serializing a field (Django/DRF) 2. class BottleSerializer (serializers. Nested annotate fields in Django REST Framework serializers. Owner = serializers.IntegerField(required=False) Simple as that, adding the WineSerializer as a field solved it. Inspecting these automatically generated fields can be a useful tool for determining how to customize the relationship style. class FavoriteListSerializer(serializers.ModelSerializer): When using the ModelSerializer class, serializer fields and relationships will be automatically generated for you. I am still getting error when saving the record. When using HTML encoded form input be aware that omitting a value will always be treated as setting a field to False, even if it has a defaultTrue option specified. So I have a model which has a field that's not nullable but I want it to be populated in the pre_save method, so I have set the field to required=False in serializer, but doesn't seem to work. 'Django REST Framework serializer field requiredfalse' might help you. Set to false if this field is not required to be present during deserialization. Normally an error will be raised if a field is not supplied during deserialization. Writing nested serializers can usually be avoided by using the various types of serializer relations provided by the Django REST framework that you can find. Set this to True to ensure that the field is used when serializing a representation, but is not used when updating an instance during deserialization.
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