Django Class Based Views, get_absolute_url not working

Question

I bought and am Reading the Book Two Scoops of Django:Best Practices for Django 1.5 and in it has a example of Class based views. After this implementation I get the error afte

Answer 1

Solved the problem after reading the first sentence of Austin Phillips:

    def form_valid(self, form):
        article = form.save(commit=False)
        article.author = self.request.user
        self.object = article.save()
        return super().form_valid(form)

the point is the save article.save()'s result back to self.object