reverse_lazy() in Django

Posted on by

from: https://stackoverflow.com/questions/31275574/reverse-for-success-url-on-django-class-based-view-complain-about-circular-impor

for the classes inherited from generic.edit.CreateView, success_url = url.name does not work because:

Using reverse  in your method works because reverse  is called when the view is run.

def my_view(request):
  url = reverse('blog:list-post')
  ...

If you override get_success_url , then you can still use reverse  because get_success_url  calls reverse  when the view is run.

class BlogCreateView(generic.CreateView):
  ...
  def get_success_url(self):
    return reverse('blog:list-post')

However, you can’t use reverse  with success_url  because then reverse  is called when the module is imported before the urls have been loaded.

Overriding get_success_url  is one option, but the easiest fix is to use reverse_lazy  instead of reverse .

from django.core.urlresolvers import reverse_lazy

class BlogCreateView(generic.CreateView):
  ...
  success_url = reverse_lazy('blog:list-post')