Check if record exists in Django Rest Framework API LIST/DATABASE

Question

I want to create a viewset/apiview with a path like this: list/<slug:entry>/ that once I provide the entry it will check if that entry exists in the database.

*Note: on list/ I have a path to a ViewSet. I wonder if I could change the id with the specific field that I want to check, so I could see if the entry exists or not, but I want to keep the id as it is, so

I tried:

class CheckCouponAPIView(APIView):
    def get(self, request, format=None):
        try:
            Coupon.objects.get(coupon=self.kwargs.get('coupon'))
        except Coupon.DoesNotExist:
            return Response(data={'message': False})
        else:
            return Response(data={'message': True})

But I got an error: get() got an unexpected keyword argument 'coupon'.

Here's the path: path('check/<slug:coupon>/', CheckCouponAPIView.as_view()),

Is there any good practice that I could apply in my situation?

JPG · Accepted Answer · 2018-04-09 07:05:36Z

1

What about trying something like this,

class CheckCouponAPIView(viewsets.ModelViewSet):
    # other fields
    lookup_field = 'slug'

From the official DRF Doc,

lookup_field - The model field that should be used to for performing object lookup of individual model instances. Defaults to pk

answered Apr 9, 2018 at 7:05

JPG

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2 Comments

yierstem Over a year ago

I tried it on Serializer for whatever reason. Thanks.

JPG Over a year ago

You don't have to do it elsewhere because it can be done with just lookup_field and it's more simplified

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