code: def retrieve(self, request, project, pk=None):
          
          job_id, bug_id = map(int, pk.split("-"))
          job = Job.objects.get(repository__name=project, id=job_id)
          try:
              bug_job_map = BugJobMap.objects.get(job=job, bug_id=bug_id)
              serializer = BugJobMapSerializer(bug_job_map)
  
              return Response(serializer.data)
          except BugJobMap.DoesNotExist:
              return Response("Object not found", status=HTTP_404_NOT_FOUND)
docs: Retrieve a bug-job-map entry. pk is a composite key in the form
          bug_id-job_id