Celery EncodeError(TypeError('Object of type Response is not JSON serializable'))

Question

I am using Celery - Redis - Django rest framework together. The error happens when I try to pass the serializer to the delay of celery within the Django rest framework.

Here is the viewset

class TestSet(viewsets.ModelViewSet):

    queryset = Test.objects.all()
    serializer_class = ImageSerializer

    def create(self, request, *args, **kwargs):
         serializer = TestSerializer(data=request.data)

         if serializer.is_valid():

            image_uploaded= "static_path"
            
            json_data = base64.b64encode(np.array(image_uploaded)).decode('ascii')
            result = test_call.delay({'image': json_data})
            result = test_call.delay(serializer)

            data = {"task": result.task_id}

            return Response(data, status=status.HTTP_201_CREATED)
        return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)

@shared_task(name="values")
def test_call(decoded_image):
    return decoded_image

The error I get is

EncodeError(TypeError('Object of type Response is not JSON serializable'))

Update: Even when I do this, I still get an error

result = test_call.delay({"task": 1})

@shared_task(name="values")
def test_call(decoded_image):
    return {"task": 2}

Where is TestSerializer defined?

Greg Cowell
– Greg Cowell

2021-11-12 00:29:20 +00:00
Commented Nov 12, 2021 at 0:29 — Greg Cowell
– Greg Cowell, Commented Nov 12, 2021 at 0:29

Nick Collins · Accepted Answer · 2021-11-11 16:13:33Z

3

This isn't going to answer your question, but I can't leave a comment (low reputation).

It seems that you are trying to JSON Serialize something that obviously isn't JSON serializable. Based on the name, it is some kind of image data. You could try a different workflow that should be JSON Serializable, example:

One Example:

first save the image somewhere that is accessible later and add the location in the serializer (S3 bucket and then a link to the image)
In your celery task, fetch the image data based on that location

Second Example:

convert the image data into something JSON serializable like a Base64 image string

answered Nov 11, 2021 at 16:13

Nick Collins

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1 Comment

Joseph Adam Over a year ago

as mentioned briefly this helped and I started another question stackoverflow.com/questions/69942867/…

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