              slug_field = models.SlugField(max_length=1024, blank=True)
              url_field = models.URLField(max_length=1024, blank=True)
  
          class AMOAFSerializer(serializers.ModelSerializer):
              class Meta:
                  model = AMOAFModel
  
 
</s>
            nullable_char_field = models.CharField(max_length=1024, blank=True, null=True)
              slug_field = models.SlugField(max_length=1024, blank=True)
              url_field = models.URLField(max_length=1024, blank=True)
            nullable_char_field = models.CharField(max_length=1024, blank=True, null=True)
  
          class AMOAFSerializer(serializers.ModelSerializer):
              class Meta:
                  model = AMOAFModel
  
keep add keep keep keep keep keep
 Test for setting allow_none=True for nullable CharFields
rest_framework/tests/test_serializer.py