Django Login Class Based View

class Login(FormView):
    """
        Provides the ability to login as a user with a username and password
    """
    success_url = '/'
    form_class = UserLoginForm
    template_name = 'accounts/form.html'

    extra_context = {
        'title': 'Login'
    }

    def dispatch(self, request, *args, **kwargs):
        if self.request.user.is_authenticated:
            return HttpResponseRedirect(self.get_success_url())
        return super().dispatch(self.request, *args, **kwargs)

    def get_form_class(self):
        return self.form_class

    def form_valid(self, form):
        auth.login(self.request, form.get_user())
        return HttpResponseRedirect(self.get_success_url())

    def form_invalid(self, form):
        """If the form is invalid, render the invalid form."""
        return self.render_to_response(self.get_context_data(form=form))