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

You can use a session to store the hash

import hashlib

def contact(request):
    if request.method == 'POST':
        form = MyForm(request.POST)
        #join all the fields in one string
        hashstring=hashlib.sha1(fieldsstring)
        if request.session.get('sesionform')!=hashstring:
            if form.is_valid() :                                         
                request.session['sesionform'] = hashstring
                #do some stuff...
                return HttpResponseRedirect('/thanks/') # Redirect after POST  
        else
           raise SubmissionWasDuplicate("duplicate")
    else:
        form = MyForm() 

With this approach (not deleting the session cookie) the user can't re-store the data util the session expires, by the way, i'm assuming that exist something who identify the user who send the data