Best way to prevent repopulation form after success submit?

I don't have complete repopulation with the function above. Only if it might be helpful for the user. See example above. Also my models check if an entry also exists in validation process. Are you still thinking in this case it isn't a fine solution?

Yes, there's no condition under which I would think otherwise.

Even if you want to repopulate the form, it's still worth doing the redirect in order to remove the resubmit-on-refresh effect.