django orm query if no result try another query code example

Example 1: how do i check if a django queryset is empty

queryset = demo.objects.filter(name="non_existent_name")

if queryset.exists():
    serializer = DemoSerializer(queryset, many=True)
    return Response(serializer.data)
else:
    return Response(status=status.HTTP_404_NOT_FOUND)

Example 2: django filter values with OR operator

Blog.objects.filter(pk__in=[1, 4, 7])

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