Django Update View Without Slug

urls.py

from django.conf.urls import patterns, include, url
from .views import UserUpdate

urlpatterns = patterns(
    '',
    url(r'^settings/$', UserUpdate.as_view(), name='accounts_settings'),
)

views.py

from django.views.generic.edit import UpdateView
from django.core.urlresolvers import reverse_lazy
from braces.views import LoginRequiredMixin
from .models import NeighborhoodNetUser
from .forms import SettingsForm

class UserUpdate(LoginRequiredMixin, UpdateView):
    model = NeighborhoodNetUser
    form_class = SettingsForm
    template_name = 'accounts/settings.html'
    success_message = 'Your settings have been saved.'
    success_url = reverse_lazy('home')

    def get_object(self):
        return NeighborhoodNetUser.objects.get(email=self.request.user.email)