How to call a function after creating object in Django Rest Framework?

Question

I have a tour and a group model. Whenever a new group gets created I would like to adjust the tour size fields. If I understood correctly, the dispatch() method is the right place for this. However I receive following error:

AttributeError at /booking/newgroup/
'WSGIRequest' object has no attribute 'data'

def reduceTourSize(id, pers):
    t = Tour.objects.get(id=id)
    t.available_size = t.available_size - int(pers)
    t.current_size = t.current_size + int(pers)
    t.save()
    return t.current_size
    
    
class NewGroup(generics.CreateAPIView):
    serializer_class = GroupListSerializer
    queryset = Group.objects.all()
    
    def dispatch(self, request, *args, **kwargs):
        myresult = reduceTourSize(request.data['tour'], request.data['persons'])
        return Response(data={"current_size": myresult})

So how can I access the parameters passed in via POST?

sahinakkaya · Accepted Answer · 2021-02-23 20:49:30Z

1

Shouldn't you be accessing POST data inside the post method?

class NewGroup(generics.CreateAPIView):
    serializer_class = GroupListSerializer
    queryset = Group.objects.all()

    def post(self, request, *args, **kwargs):
       name = request.data.get("name")
       -------

edited Feb 23, 2021 at 20:49

sahinakkaya

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answered Feb 23, 2021 at 20:27

SDRJ

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Degrijo · Accepted Answer · 2021-02-23 20:36:42Z

1

You don't need to use dispatch here, check behavior, that CreateModelMixin provide you. It call save() method in serializer that call create() method in serializer, so you need to override this method. In create method you can get data from validated_data parameter.

answered Feb 23, 2021 at 20:36

Degrijo

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Tobi · Accepted Answer · 2021-02-23 20:41:21Z

1

The solution from @SDRJ works fine:

class NewGroup(generics.CreateAPIView):
    serializer_class = GroupListSerializer
    queryset = Group.objects.all()

    def post(self, request, *args, **kwargs):
        myresult = reduceTourSize(request.data['tour'], request.data['persons'])
        return self.create(request, *args, **kwargs)

answered Feb 23, 2021 at 20:41

Tobi

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