Python-сообщество

from django.shortcuts import render_to_response
from django.template import RequestContext
from cart.cart_new import cart_distinct_item_count


def show_cart(request, template_name = 'cart/cart.html'):
    cart_item_count = cart_distinct_item_count(request)
    page_title = "Shopping Cart"
    return render_to_response(template_name, locals(), context_instance = RequestContext(request))

from cart.models import CartItem
from catalog.models import Product

from django.shortcuts import get_object_or_404

import decimal
import random

CART_ID_SESSION_KEY = 'cart_id'

def _cart_id(request):
    if request.session.get(CART_ID_SESSION_KEY,'') == '':
        request.session[CART_ID_SESSION_KEY] = _generate_cart_id()
    return request.session[CART_ID_SESSION_KEY]

def _generate_cart_id():
    cart_id = ''
    characters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890!@#$%^&*()'
    cart_id_length = 50
    for y in range(cart_id_length):
        cart_id += characters[random.randint(0, len(characters)-1)]
    return cart_id

def get_cart_items(request):
    return CartItem.objects.filter(cart_id=_cart_id(request))

def add_to_cart(request):
    postdata = request.POST.copy()
    product_slug = postdata.get('product_slug','')
    quantity = postdata.get('quantity',1)
    p = get_object_or_404(Product, slug=product_slug)
    cart_products = get_cart_items(request)
    product_in_cart = False
    for cart_item in cart_products:
        if cart_item.product.id == p.id:
            cart_item.augment_quantity(quantity)
            product_in_cart = True
    if not product_in_cart:
        ci = CartItem()
        ci.product = p
        ci.quantity = quantity
        ci.cart_id = _cart_id(request)
        ci.save()

def cart_distinct_item_count(request):
    return get_cart_items(request).count()