Using built in Django authentication/User model with Mongodb
def adduser(request):
     username = request.POST['username']
     password = request.POST['password']
     u = User.objects.create_user(username, request.POST['email'], password)
     u.save()
     a = Accounts(user=u)
     p = Passwords(user=u)
     a.save()
     p.save()
     user = authenticate(username=username, password=password)
     if user is not None and user.is_active:
         auth.login(request, user)
         return HttpResponseRedirect("/%s/" %u.id)
     else:
         return HttpResponseRedirect("/account/invalid/")