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你好我正在我的電子商務django教程和由於某種原因，我的簡單購物車數不起作用。每次添加到購物車時，我的cart.html中的{{cart_item_count}}都是0Django購物車不更新數量
此外，與此代碼相關的書籍有carts.py作爲cart.py，但由於某些原因該應用程序是購物車犯規是這樣，所以我重新命名我的cart.py「carts.py」，這樣做，從 進口車的車車
不Django的不允許PY文件同名的應用程序???
爲了幫助代碼
carts.py具有功能高清cart_disinct_item_count（請求），返回被稱爲我的views.py設置其顯示在我的車的變量「cart_item_count」計數。 HTML頁面，但目前無論我的表單是什麼，都會返回0.
我沒有發佈整個項目代碼，但我想我得到了所有需要的相關信息。
感謝
cart.html
{% block content %}
<h1>Cart Page Here</h1>
Cart item count: {{cart_item_count }}
{% endblock %}
車views.py
# Create your views here.
from django.shortcuts import render_to_response
from django.template import RequestContext
from cart import carts as cart
def show_cart(request, template_name="cart/cart.html"):
cart_item_count = cart.cart_disinct_item_count(request)
page_title = 'Shopping Cart'
return render_to_response("cart/cart.html", locals(),
context_instance = RequestContext(request))
車項目模型
class CartItem(models.Model):
cart_id = models.CharField(max_length=50)
date_added = models.DateTimeField(auto_now_add = True)
quantity = models.IntegerField(default = 1)
product = models.ForeignKey('catalog.Product', unique = False)
class Meta:
app_label = ''
db_table = 'cart_items'
ordering = ['date_added']
def total(self):
return self.quantity * self.product.price
def name(self):
return self.product.name
def price(self):
return self.product.price
def get_absolute_url(self):
return self.product.get_absolute_url()
def augment_quantity(self, quantity):
""" called when a POST request comes in for a Product instance already in the shopping cart """
self.quantity = self.quantity + int(quantity)
self.save()
carts.py
def get_cart_items(request):
return CartItem.objects.filter(cart_id=_cart_id(request))
#add an item to the cart
def add_to_cart(request):
postdata = request.POST.copy()
#get product slug from post data, return blank if empty
product_slug = postdata.get('product_slug', '')
#get quantity added, return 1 if empty
quantity = postdata.get('quantity', 1)
#fetch the product or return a missing page error
p = get_object_or_404(Product, slug = product_slug)
#get products in cart
cart_products = get_cart_items(request)
product_in_cart = False
#check to see if item is already in cart
for cart_item in cart_products:
if cart_item.product.id == p.id:
#update the quantity if found
cart_item.augment_quantity(quantity)
product_in_cart = True
if not product_in_cart:
#create and save a new cart item
ci = CartItem()
ci.product = p
ci.quantity = quantity
ci.cart_id = _cart_id(request)
ci.save()
#returns the total number of items in the user's cart
def cart_disinct_item_count(request):
return get_cart_items(request).count()
forms.py：
class ProductAddToCartForm(forms.Form):
quantity = forms.IntegerField(widget=forms.TextInput(attrs={'size':'2',
'value':'1', 'class':'quantity'}),
error_messages={'invalid': 'Please enter a valid quantity'},
min_value = 1)
product_slug = forms.CharField(widget = forms.HiddenInput())
#override the default __init__ so we can set the request
def __init__(self, request = None, *args, **kwargs):
self.request = request
super(ProductAddToCartForm, self).__init__(*args, **kwargs)
* EDIT ** 忘了添加顯示了產品，並調用add_to_cart視圖：
#new product view, with POST vs GET detection
DEF show_product（請求，product_slug，template_name =「catalog/product.html」）：
p = get_object_or_404(Product, slug=product_slug)
categories = p.categories.all()
page_title = p.name
meta_keywords = p.meta_keywords
meta_description = p.meta_description
#need to evaluate the HTTP method
if request.method == 'POST':
#add to cart....create the bound form
postdata = request.POST.copy()
form = ProductAddToCartForm(request, postdata)
#check if posted data is valid
if form.is_valid():
#add to cart and redirect to cart page
cart.add_to_cart(request)
# if test cookie worked, get rid of it
if request.session.test_cookie_worked():
request.session.delete_test_cookie()
url = urlresolvers.reverse('show_cart')
return HttpResponseRedirect(url)
else:
# it's a GET, create the unbound form. Note request as a kwarg
form = ProductAddToCartForm(request = request, label_suffix = ':')
#assign the hidden input the product slug
form.fields['product_slug'].widget.attrs['value'] = product_slug
#set the test cookie on our first GET request
request.session.set_test_cookie()
return render_to_response("catalog/product.html", locals(), context_instance=RequestContext(request))
*** *** UPDATE好的，我想通了，我add_to_cart（請求）功能在我的carts.py工作不正常...我會嘗試看看究竟發生了什麼，如果我有任何問題，我會發布它... – mcd