python - Remove null fields from Django Rest Framework response -

i have developed api using django-rest-framework. using modelserializer return data of model.

models.py

class metatags(models.model):     title = models.charfield(_('title'), max_length=255, blank=true, null=true)     name = models.charfield(_('name'), max_length=255, blank=true, null=true) 

serializer.py

class metatagsserializer(serializers.modelserializer):     class meta:         model = metatags 

response

{     "meta": {         "title": null,         "name": "xyz"     } } 

ideally in api response value not present should not sent in response. when title null want response be:

{     "meta": {         "name": "xyz"     } } 

you try overriding to_native function:

class metatagsserializer(serializers.modelserializer):     class meta:         model = metatags      def to_native(self, obj):         """         serialize objects -> primitives.         """         ret = self._dict_class()         ret.fields = self._dict_class()          field_name, field in self.fields.items():             if field.read_only , obj none:                 continue             field.initialize(parent=self, field_name=field_name)             key = self.get_field_key(field_name)             value = field.field_to_native(obj, field_name)              # continue if value none not serialized.             if value none:                 continue              method = getattr(self, 'transform_%s' % field_name, none)             if callable(method):                 value = method(obj, value)             if not getattr(field, 'write_only', false):                 ret[key] = value             ret.fields[key] = self.augment_field(field, field_name, key, value)          return ret 

i copied base to_native function serializers.baseserializer , added check value.