how to pass the current user in reverse_lazy()

DeleteView:

class DeletePost(LoginRequiredMixin, SelectRelatedMixin, generic.DeleteView):

    username = self.object.user.username

    model = models.Post

    select_related = ("user","teacher","subject")

    success_url = reverse_lazy("posts:for_user", kwargs={'username': self.request.user.username},)

    def get_queryset(self):

        queryset = super().get_queryset()

        return queryset.filter(user_id=self.request.user.id)

    def delete(self, *args, **kwargs):

        messages.success(self.request, "Post Deleted")

        return super().delete(*args, **kwargs)

Error in terminal:

username = self.object.user.username

NameError: name 'self' is not defined

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