serialize return choices value django representation

Question

I have models.py like this:

class Tasks(models.Model):
  id = models.AutoField(primary_key=True)
  roles = (
        (u'1', u'task1'),
        (u'2', u'task2'),
    )
  role = models.CharField(max_length=1, choices=roles, default='1')

Then I have serializers.py looking like this:

class TaskSerializer(serializers.ModelSerializer):
    class Meta:
        model = Tasks
        fields = '__all__'

My viewset looks like this:

class Tasks(viewsets.ModelViewSet):
    queryset = Tasks.objects.all()
    serializer_class = TaskSerializer

So what I want to do is; say when I make a POSt request; I want to return saved data for tasks roles; if a I save it as 1, instead of returning roles field as 1, I want to return task1. How do I do this?

https://stackoverflow.com/questions/28945327/django-rest-framework-with-choicefield — Pythonista, Mar 20 '18 at 01:02
Possible duplicate of [Django Rest Framework with ChoiceField](https://stackoverflow.com/questions/28945327/django-rest-framework-with-choicefield) — Pythonista, Mar 20 '18 at 01:02

score 1 · Answer 1 · answered Mar 20 '18 at 02:47

You can override to_representation() method in Serializer class as below,

class TaskSerializer(serializers.ModelSerializer):
    class Meta:
        model = Tasks
        fields = '__all__'

    def to_representation(self, instance):
        return_dict = dict(super().to_representation(instance))

        if self.context.get('view').action == 'create' and return_dict:
            choice_dict = {k[0]: k[1] for k in instance.roles}
            return_dict['role'] = choice_dict[return_dict['role']]

        return return_dict

Short Description
Here self.context.get('view').action == 'create' will check whether the view's action is a create (simplym, a POST request or not) or not.
So the output response for a create operation be like this,

{
    "id": 3,
    "role": "task2"
}

Why did I do a type casting to dict?
to_representaion() method return a OrderedDict() which is immutable object.

serialize return choices value django representation

1 Answers1