I decided to use {{ form.activity }} instead of that code above, but it is a bit strange, it should work in that way.
Now, I'm using django-widget-tweaks (https://github.com/kmike/django-widget-tweaks) to add some attributes to selected tag and it's working. The reason why I wasn't this to render automatically is because it gets less customizable. For example: How would you add an attribute for each option in that select field? -- You received this message because you are subscribed to the Google Groups "Django users" group. To unsubscribe from this group and stop receiving emails from it, send an email to django-users+unsubscr...@googlegroups.com. To post to this group, send email to django-users@googlegroups.com. Visit this group at http://groups.google.com/group/django-users. To view this discussion on the web visit https://groups.google.com/d/msgid/django-users/1ec396fb-ff4b-43ea-8304-4a876bd56c35%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.