Using NestedField with accept_pk kwarg can only accepted JSON input but not form-data input

[caesarleong]

I got empty field if I use form-data input when apply NestedField. It seems NestedField only support JSON input. I add some log into DRF native serializers.py's to_internal_value() and I got below log with different format input

        print('data: {}'.format(data))
        for field in fields:
            validate_method = getattr(self, 'validate_' + field.field_name, None)
            print('field: {}'.format(field))
            primitive_value = field.get_value(data)
            print('key: {}, value: {}'.format(field.field_name, primitive_value))

data: <QueryDict: {'name': ['player04'], 'merchant': ['1']}>
field: NestedField(MerchantSerializer, many=False)
key: merchant, value: <class 'rest_framework.fields.empty'>

data: {'merchant': 1, 'name': 'PlayerJson01'}
field: NestedField(MerchantSerializer, many=False)
key: merchant, value: 1

Hope NestedField can support form-data as well, Thank you very much