Does a library to prevent duplicate form submissions exist for django?

Question

I am trying to find a way to prevent users from double-submitting my forms. I have javascript that disables the submit button, but there is still an occasional user who fin

Answer 1

Kristian Damian's answer is really a great suggestion. I just thought of a slight variation on that theme, but it might have more overhead.

You could try implementing something that is used in django-piston for BaseHandler objects, which is a method called exists() that checks to see if what you are submitting is already in the database.

From handler.py (BaseHandler):

def exists(self, **kwargs):
    if not self.has_model():
        raise NotImplementedError

    try:
        self.model.objects.get(**kwargs)
        return True
    except self.model.DoesNotExist:
        return False

So let's say make that a function called request_exists(), instead of a method:

if form.is_valid()
    if request_exists(request):
        # gracefully reject dupe submission
    else:
        # do stuff to save the request
        ...
        # and ALWAYS redirect after a POST!!
        return HttpResponseRedirect('/thanks/')