title: Django: CreateView fail_url
body: <p>I've the following code and I want <code>form_invalid</code> method to return the same page as <code>success_url</code>.
  I've been considering sub-classing <code>CreateView</code> but I want to know public opinion.
  How to realize the thing described above?</p>
  
  <pre><code>class ProgramNew(CreateView):
      form_class = ProgramForm
      template_name = 'programs/program_list.html'
      success_url = '/manage/programs'
  
      ....
      ....
      ....
  
      def form_invalid(self, form):    
          # How to return to self.success_url?
          return super(ProgramNew, self).form_invalid(form)
  </code></pre>
  
  <p>Sultan</p>