[FIXED] Django rest framework create-only serializer field

Issue

I'm have a Django model that serves as a request description. It is created to issue a request by a REST client, serves to record the tasks current status, and record historical requests received by clients.

This model has a few fields that are used to fine-tune and control the requested task (say, a target object and the type of action). Obviously, I'd like the client to control those fields on object creation but not afterwards (you can't change the object once the task started running).

I was hoping for something similar to serializers.ReadOnlyField, so I could have something similar to this:

class TaskSerializer(serializers.ModelSerializer):
    owner = serializers.ReadOnlyField(source='owner.username')
    task_id = serializers.ReadOnlyField()
    target_object = serializers.CreateOnlyField()

but couldn't find it in the documentation or google.

Solution

Just to expand on Wim's answer, this is a way to select a different serialiser based on the incoming request method:

class RequestViewSet(viewsets.ModelViewSet): 
    serializer_class = RequestModelSerializer 
    model = Request 

    def get_serializer_class(self): 
        serializer_class = self.serializer_class 
        if self.request.method == 'POST': 
            serializer_class = SerializerWithoutCertainFields 
        return serializer_class

Answered By - fabio.sussetto