AddOrEditView

gistfile1.py

class AddOrEditView(generic.UpdateView):
    # The following two _kwarg attributes are introduced in Django 1.4, until
    # then, they can exist here without any concern.
    slug_url_kwarg = 'slug'
    pk_url_kwarg = 'pk'

    def get_object(self, *args, **kwargs):
        pk = self.kwargs.get(self.pk_url_kwarg)
        slug = self.kwargs.get(self.slug_url_kwarg)
        if pk is None and slug is None:
            return None
        return super(AddOrEditView, self).get_object(*args, **kwargs)