class LoginRequiredMixin(object):
    @method_decorator(login_required)
    def dispatch(self, request, *args, **kwargs):
        return super(LoginRequiredMixin, self).dispatch(request, *args, **kwargs)
class CarAdd(LoginRequiredMixin, CreateView):
   pass

class MyDeleteView(DeleteView):
    def get_object(self, queryset=None):
        """ Hook to ensure object is owned by request.user. """
        obj = super(MyDeleteView, self).get_object()
        if not obj.owner == self.request.user:
            raise Http404
        return obj

class CheckOwnerMixin(object):
    owner_field = 'owner'
    def get_object(self, queryset=None):
        obj = super(MyDeleteView, self).get_object()
        if not getattr(obj, self.owner_field) == self.request.user:
            raise Http404
        return obj
class MyDeleteView(CheckOwnerMixin, DeleteView):
    pass