from django.core.exceptions import ObjectDoesNotExist

from django.core.exceptions import ValidationError

from django.db import transaction

from django.utils import timezone

from registrasion import models as rego

        self.cart.revision += 1

        self.cart.save()

    @transaction.atomic

    def set_quantities(self, product_quantities):

        ''' Sets the quantities on each of the products on each of the

        ''' Determines whether the status of the current cart is valid;

        this is normally called before generating or paying an invoice '''

        # TODO: validate vouchers

        items = rego.ProductItem.objects.filter(cart=self.cart)

        )

        cat_count = items.aggregate(Sum("quantity"))["quantity__sum"] or 0

from collections import defaultdict

from collections import namedtuple

from django.db.models import Sum

from django.utils import timezone

                             "product_quantities")

        elif products is None:

            products = set(i[0] for i in product_quantities)

        elif product_quantities is None:

            products = set(products)

            quantities = {}

        # if there are no mandatory conditions

        non_mandatory = defaultdict(lambda: False)

        for condition in all_conditions:

            cond = cls.for_condition(condition)

            remainder = cond.user_quantity_remaining(user)

        return self.ceiling.limit - count

class TimeOrStockLimitEnablingConditionController(

        TimeOrStockLimitConditionController):

import itertools

from django.db.models import Sum

from registrasion import models as rego

        passed_limits = set(

            product

            for product in all_products

            if cls(product).user_quantity_remaining(user) > 0

        )

from django.core.exceptions import ObjectDoesNotExist

class TestingCartController(CartController):

    def set_quantity(self, product, quantity, batched=False):

            quantity=10,

        ).save()

    @classmethod

    def new_voucher(self, code="VOUCHER", limit=1):

        voucher = rego.Voucher.objects.create(

from django.contrib import messages

from django.core.exceptions import ObjectDoesNotExist

from django.core.exceptions import ValidationError

from django.http import Http404

from django.shortcuts import redirect

from django.shortcuts import render