Question 110404 in Json Question posted in
Our archive of expertly curated questions and answers provides insights and solutions to common problems related to this popular data interchange format. From parsing and manipulating JSON data to integrating it with various programming languages and web services, our archive has got you covered. Start exploring today and take your JSON skills to the next level

Json – Django APIView: how to display calculated value

I have to display a calculated value in APIVIEW, but I can’t figure out how to set up the view, it’s giving me an error.

The code, that returns a simple JSON is working fine:

def protein_coverage(request, protein_id):
    try:
        proteins = Protein.objects.filter(protein=protein_id)
        domain_length = 0
    
        coverage = domain_length / protein_length
        

    except Protein.DoesNotExist:
        return HttpResponse({'message': 'This Protein does not exist'}, status=status.HTTP_404_NOT_FOUND)

    if request.method == 'GET':

        serializer = ProteinCoverageSerializer(coverage)
        return JsonResponse(serializer.data,safe=False)

I tried this for the APIView:

class ProteinCoverage(generics.RetrieveAPIView):
    serializer_class = ProteinCoverageSerializer

    def get_queryset(self):
        pk = self.kwargs['protein_id']
        proteins = Protein.objects.filter(protein=pk)
        domain_length = 0
    
        coverage = domain_length / protein_length
        return coverage

But it’s giving me an error:

Expected view ProteinCoverage to be called with a URL keyword argument named "pk". Fix your URL conf, or set the `.lookup_field` attribute on the view correctly.

I’m not sure, which API is suitable for this situation and how to pass a single variable to it.

I also checked the documentation, but it’s not clear.
How do I convert this JsonResponse to APIView?

Tags:

2

Answers


  1. 0

    You have to use lookup_fields. Refer docs

    Login or Signup to reply.
  2. 0

    You can simply do it with APIView:

    from rest_framework.response import Response
from rest_framework.views import APIView

class ProteinCoverageView(APIView):

    def get(self, request, protein_id):
        try:
            proteins = Protein.objects.filter(protein=protein_id)
            domain_length = 0
        
            coverage = domain_length / protein_length
        
        except Protein.DoesNotExist:
            return Response({'message': 'This Protein does not exist'}, status=status.HTTP_404_NOT_FOUND)
        
        
        serializer = ProteinCoverageSerializer(coverage)
        return Response(serializer.data)
    Login or Signup to reply.
Please signup or login to give your own answer.

Back To Top
Search