return response in django rest-framework

Question

I am writing an app in django rest-framework: My views.py:

class tagList(generics.ListCreateAPIView,APIView):

    model = tags
    serializer_class = getAllTagsDetailSerializer
    def get_queryset(self):
        print "q1"
        print self.request.QUERY_PARAMS.get('tag', None)
        print self.request.user
        print "q1"
        if tags.objects.filter(tag='burger')!= None:
             return tags.objects.filter(tag='burger')
        else:
            content = {'please move along': 'nothing to see here'}
            return Response(content, status=status.HTTP_404_NOT_FOUND)

I want to return error status code if query returns None. But the problem if i try to set Response it throws error:

Exception Type: TypeError
Exception Value:    
object of type 'Response' has no len()
Exception Location: /usr/local/lib/python2.7/dist-packages/django/core/paginator.py in _get_count, line 53

Else if query result is Not None it is working. How can i set status code on Django rest-framework.

Answer 1

Can you try this

model = tags # Model name
serializer_class = getAllTagsDetailSerializer # Call serializer

def get_queryset(self):
    key = self.request.QUERY_PARAMS.get('appKey', None)
    getTagName = self.request.QUERY_PARAMS.get('tagName')
    keyData = app.objects.filter(appKey=key).exists()    
    try:
        if keyData == True:
            return tags.objects.filter(tag=getTagName)
        else:
            raise exceptions.PermissionDenied
    except app.DoesNotExist:
        pass

I think it will work....

Answer 2

The method is expected to return a QuerySet, not a Response object, my bet is that you should throw an Exception, either an APIException or an Http404.

Anyway your handling seems odd, I think you should just return the QuerySet and the framework will handle if the result is empty or not. The method should look like this:

def get_queryset(self):
    return tags.objects.filter(tag='burger')