Help with DRF error

[Larry Martell]

I have a DRF API. It is throwing an error that I have not been able to fix.

Here is my view and serializer:

class CreateNotations(CreateAPIView):
    permission_classes = [IsAuthenticated]
    serializer_class = NotationListSerializer

    def post(self, request, *args, **kwargs):
        return super().post(request, *args, **kwargs)

class NotationListSerializer(serializers.Serializer):
    workitem_id = serializers.PrimaryKeyRelatedField(queryset=WorkItem.objects.all(), source="workitem")
    notations = NotationSerializer(many=True)

    def create(self, validated_data):
        workitem = validated_data["workitem"]

        IncompleteAnalysis.objects.filter(workitem=workitem).delete()

        data = []
        for notation in validated_data["notations"]:
            data.append({
                'workitem': workitem,
                'incomplete_analysis_reason': notation["reason"],
                'vessel_affected': notation["vessel"],
                'user': self.context['request'].user,
                'timestamp': datetime.now().isoformat()
            })

        return IncompleteAnalysis.objects.bulk_create([IncompleteAnalysis(**d) for d in data])

The body of the request received is:

{'workitem_id': 244, 'notations': [{'reason_id": 4, 'vessel_id': 6}]}

It fails with this:

AttributeError: Got AttributeError when attempting to get a value for field `workitem_id` on serializer `NotationListSerializer`.
The serializer field might be named incorrectly and not match any attribute or key on the `list` instance.
Original exception text was: 'list' object has no attribute 'workitem'.

Here is the stack trace:

ERROR    django.request:log.py:241 Internal Server Error: /api/notations/
Traceback (most recent call last):
  File "/home/larrymartell/.local/lib/python3.8/site-packages/rest_framework/fields.py", line 446, in get_attribute
    return get_attribute(instance, self.source_attrs)
  File "/home/larrymartell/.local/lib/python3.8/site-packages/rest_framework/fields.py", line 96, in get_attribute
    instance = getattr(instance, attr)
AttributeError: 'list' object has no attribute 'workitem'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/larrymartell/.local/lib/python3.8/site-packages/django/core/handlers/exception.py", line 56, in inner
    response = get_response(request)
  File "/home/larrymartell/.local/lib/python3.8/site-packages/django/core/handlers/base.py", line 197, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/home/larrymartell/.local/lib/python3.8/site-packages/django/views/decorators/csrf.py", line 55, in wrapped_view
    return view_func(*args, **kwargs)
  File "/home/larrymartell/.local/lib/python3.8/site-packages/django/views/generic/base.py", line 103, in view
    return self.dispatch(request, *args, **kwargs)
  File "/home/larrymartell/.local/lib/python3.8/site-packages/rest_framework/views.py", line 509, in dispatch
    response = self.handle_exception(exc)
  File "/home/larrymartell/.local/lib/python3.8/site-packages/rest_framework/views.py", line 469, in handle_exception
    self.raise_uncaught_exception(exc)
  File "/home/larrymartell/.local/lib/python3.8/site-packages/rest_framework/views.py", line 480, in raise_uncaught_exception
    raise exc
  File "/home/larrymartell/.local/lib/python3.8/site-packages/rest_framework/views.py", line 506, in dispatch
    response = handler(request, *args, **kwargs)
  File "/inst/martell/EVServer/app/CAPgraph/createevapi/views.py", line 1270, in post
    return super().post(request, *args, **kwargs)
  File "/home/larrymartell/.local/lib/python3.8/site-packages/rest_framework/generics.py", line 190, in post
    return self.create(request, *args, **kwargs)
  File "/home/larrymartell/.local/lib/python3.8/site-packages/rest_framework/mixins.py", line 20, in create
    headers = self.get_success_headers(serializer.data)
  File "/home/larrymartell/.local/lib/python3.8/site-packages/rest_framework/serializers.py", line 555, in data
    ret = super().data
  File "/home/larrymartell/.local/lib/python3.8/site-packages/rest_framework/serializers.py", line 253, in data
    self._data = self.to_representation(self.instance)
  File "/home/larrymartell/.local/lib/python3.8/site-packages/rest_framework/serializers.py", line 509, in to_representation
    attribute = field.get_attribute(instance)
  File "/home/larrymartell/.local/lib/python3.8/site-packages/rest_framework/relations.py", line 190, in get_attribute
    return super().get_attribute(instance)
  File "/home/larrymartell/.local/lib/python3.8/site-packages/rest_framework/fields.py", line 479, in get_attribute
    raise type(exc)(msg)
AttributeError: Got AttributeError when attempting to get a value for field `workitem_id` on serializer `NotationListSerializer`.
The serializer field might be named incorrectly and not match any attribute or key on the `list` instance.
Original exception text was: 'list' object has no attribute 'workitem'.

  

This is vexing as I have other very similar APIs that work fine.

Thanks!

Larry

[Reddy Tintaya]

Can't you just use 
    workitem = serializers.PrimaryKeyRelatedField(queryset=WorkItem.objects.all())
instead of workitem_id?

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[Larry Martell]

On Sat, Dec 16, 2023 at 1:10 PM Reddy Tintaya <rtin...@momnt.com> wrote:

Can't you just use 
    workitem = serializers.PrimaryKeyRelatedField(queryset=WorkItem.objects.all())
instead of workitem_id?

No because workitem_id is what is sent in the request.