Question

尝试创建购物车应用程序，目前卡住尝试从购物车中删除单个商品。我似乎无法找到如何删除单个产品，因为它目前使用删除功能删除了所有产品ID。

这是cart.py文件：

from decimal import Decimal
from django.conf import settings
from shop.models import Product


class Cart(object):

    def __init__(self, request):
        """
        Initialize the cart.
        """
        self.session = request.session
        cart = self.session.get(settings.CART_SESSION_ID)
        if not cart:
            # save an empty cart in the session
            cart = self.session[settings.CART_SESSION_ID] = {}
        self.cart = cart

    def __len__(self):
        """
        Count all items in the cart.
        """
        return sum(item['quantity'] for item in self.cart.values())

    def __iter__(self):
        """
        Iterate over the items in the cart and get the products from the database.
        """
        product_ids = self.cart.keys()
        # get the product objects and add them to the cart
        products = Product.objects.filter(id__in=product_ids)
        for product in products:
            self.cart[str(product.id)]['product'] = product

        for item in self.cart.values():
            item['price'] = Decimal(item['price'])
            item['total_price'] = item['price'] * item['quantity']
            yield item

    def add(self, product, quantity=1, update_quantity=False):
        """
        Add a product to the cart or update its quantity.
        """
        product_id = str(product.id)
        if product_id not in self.cart:
            self.cart[product_id] = {'quantity': 0,
                                      'price': str(product.price)}
        if update_quantity:
            self.cart[product_id]['quantity'] = quantity
        else:
            self.cart[product_id]['quantity'] += quantity
        self.save()

    def remove(self, product):
        """
        Remove a product from the cart.
        """
        product_id = str(product.id)
        if product_id in self.cart:
            del self.cart[product_id]
            self.save()

    def save(self):
        # update the session cart
        self.session[settings.CART_SESSION_ID] = self.cart
        # mark the session as "modified" to make sure it is saved
        self.session.modified = True

    def clear(self):
        # empty cart
        self.session[settings.CART_SESSION_ID] = {}
        self.session.modified = True

    def get_total_price(self):
        return sum(Decimal(item['price']) * item['quantity'] for item in self.cart.values())

这是views.py：

from django.shortcuts import render, redirect, get_object_or_404
from django.views.decorators.http import require_POST
from shop.models import Product
from .cart import Cart
from .forms import CartAddProductForm


@require_POST
def cart_add(request, product_id):
    cart = Cart(request)
    product = get_object_or_404(Product, id=product_id)
    form = CartAddProductForm(request.POST)
    if form.is_valid():
        cd = form.cleaned_data
        cart.add(product=product,
                #  quantity=cd['quantity'],
                 update_quantity=cd['update'])
    return redirect(product.category.get_absolute_url())


def cart_remove(request, product_id):
    cart = Cart(request)
    product = get_object_or_404(Product, id=product_id)
    cart.remove(product)
    return redirect('cart:cart_detail')


def cart_detail(request):
    cart = Cart(request)
    for item in cart:
        item['update_quantity_form'] = CartAddProductForm(initial={'quantity': item['quantity'],
                                                                   'update': True})
    return render(request, 'cart/detail.html', {'cart': cart})

非常感谢任何帮助！

Answer 1

您只需编辑remove方法即可。从数量中减去一个，并删除没有剩余的项目。

def remove(self, product):
    """
    Remove a product from the cart.
    """
    product_id = str(product.id)
    if product_id in self.cart:
        # Subtract 1 from the quantity
        self.cart[product_id]['quantity'] -= 1
        # If the quantity is now 0, then delete the item
        if self.cart[product_id]['quantity'] == 0:
            del self.cart[product_id]
        self.save()

从Django购物车中删除单个项目

1 个答案: