custom_response_serializer.py

# in this seriliazer : 'user' is forignkey to customuser
# i need add user name and pk instead of pk only


class LandSerializer(serializers.ModelSerializer):
	points = PointSerializer(many=True, read_only=True)

	class Meta:
		model = Land
		fields = ('pk', 'user', 'name', 'create_time', 'points')

	def to_representation(self, instance):
    # this will add user full_name filed to user objects
		response = super().to_representation(instance)
		response['user'] = {'pk': 0, 'full_name': ''}
		response['user']['pk'] = UserSerializer(instance=instance.user).data['pk']
		response['user']['full_name'] = UserSerializer(instance=instance.user).data['full_name']
		return response
  
"""
this is how above code will response :
{
    "pk": 48,
    
    "user": { # now user have pk and its full_name field
        "pk": 1,
        "full_name": "soroush safari"
    },
    
    "name": "so",
    
    "create_time": "2020-04-09T12:04:29.066928Z"
}
"""