python - Remove null fields from Django Rest Framework response

Question

I have developed an API using django-rest-framework. I am using ModelSerializer to return data of a 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 an API response any value which is not present should not be sent in the response. When the title is null I want the response to be:

{
    "meta": {
        "name": "XYZ"
    }
}

Answer 1

I found this solution to be the simplest.

from collections import OrderedDict
from rest_framework import serializers

class NonNullModelSerializer(serializers.ModelSerializer):
    def to_representation(self, instance):
        result = super(NonNullModelSerializer, self).to_representation(instance)
        return OrderedDict([(key, result[key]) for key in result if result[key] is not None])