import sys

import util

from registrasion import forms

from registrasion import util

from registrasion.models import commerce

from registrasion.models import inventory

from registrasion.models import people

from registrasion.controllers.batch import BatchController

from registrasion.controllers.cart import CartController

from registrasion.controllers.credit_note import CreditNoteController

from registrasion.controllers.discount import DiscountController

from registrasion.controllers.invoice import InvoiceController

from registrasion.controllers.item import ItemController

from registrasion.controllers.product import ProductController

from registrasion.exceptions import CartValidationError

from collections import namedtuple

from django import forms as django_forms

from django.conf import settings

from django.contrib.auth.decorators import login_required

from django.contrib.auth.decorators import user_passes_test

from django.contrib.auth.models import User

                for form in formset:

                    if "product" not in form.cleaned_data:

                        # This is the empty form.

                        continue

                    if form.cleaned_data["product"] == product:

                        form.add_error("quantity", message)

    if request.POST and voucher_form.has_changed() and voucher_form.is_valid():

        try:

            current_cart.apply_voucher(voucher_form.cleaned_data["voucher"])

            return redirect(amend_registration, user_id)

        except ValidationError as ve:

            voucher_form.add_error(None, ve)

    ic = ItemController(user)

    data = {

        "user": user,

        "paid": ic.items_purchased(),

        "cancelled": ic.items_released(),

        "form": formset,

        "voucher_form": voucher_form,

    }

    return render(request, "registrasion/amend_registration.html", data)