getting the IntegrityError Message in Django view

Question

I Have a complex model with 6 constrains and i want to get a message to the user which constrain failed when the post-request fails.

 class testView(APIView):
    @staticmethod
    def post(request):
         serializer = testSerializer(data=request.data)

         if not serializer.is_valid():
             return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)

         try:
             testModel.objects.create(
                 # all the data
             )
             return testView.get(request)
         except IntegrityError:
             return Response(status=status.HTTP_403_FORBIDDEN)

The exception is called but I cant find the specific constrain that faild in the IntegrityErrorclass.

Is there any way to return the specific Constrain to the User?

(iam using django 3.0.2 with Postgresql)

iklinac · Accepted Answer · 2020-05-13 17:06:55Z

4

Get the actual error message from exception

except IntegrityError as e:
    error_message = e.__cause__

As per PEP 3134, a __cause__ attribute is set with the original (underlying) database exception, allowing access to any additional information provided.

edited May 13, 2020 at 17:06

answered May 13, 2020 at 16:40

iklinac

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4 Comments

Allamanda Weitgereist Over a year ago

if I do this i get this error: AttributeError: type object 'IntegrityError' has no attribute 'message' did you tried it yourself?

iklinac Over a year ago

It depends on version of python/django sorry pasted old one, now it is in args[0] or just use _cause_ as per PEP 3134

Webucator Over a year ago

If you're going to check for a substring in __cause__, you need to stringify it, so maybe use error_message = str(e.__cause__). But I think error_message = e.args[0] is cleaner.

iklinac Over a year ago

e.args[0] could raise index error in cases there is no exception message, to be frank I am not having a particular example of it happening for this use case

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