Django的cart_add cart.py不顯示項目

Question

我要創造我的購物車Django的shop.i啓動新的應用程序命名爲購物車和新文件添加到這個應用程序cart.py。在這個文件中，我創建了類Cart，並添加了一些功能。 這是cart.py

class Cart(object): 
    def __init__(self, request): 
     """ 

     Inicjaliazacja koszyka na zakupy. 
     """ 
     self.session = request.session 
     cart = self.session.get(settings.CART_SESSION_ID) 
     if not cart: 
      # pusty koszyk w sesji 
      cart = self.session[settings.CART_SESSION_ID] = {} 
     self.cart = cart 

    def add(self, product, quantity=1, update_quantity=False, size=None, upd_size=False): 
     """ 
     Dodanie produktu i zmiana ilości 
     """ 
     product_id = str(product.id) 
     if product_id not in self.cart: 
      self.cart[product_id] = {'quantity': 0, 
            'size': None, 
            'price': str(product.price)} 
     if update_quantity: 
      self.cart[product_id]['quantity'] = quantity 
     else: 
      self.cart[product_id]['quantity'] += quantity 
     if upd_size: 
      self.cart[product_id]['size'] = size 
     else: 
      self.cart[product_id]['size'] += size 
     self.save() 

    def save(self): 
     self.session[settings.CART_SESSION_ID] = self.cart 
     self.session.modified = True 

    def remove(self, product): 
     """ 
     Usunięcie produktów z koszyka 
     """ 
     product_id = str(product.id) 
     if product_id in self.cart: 
      del self.cart[product_id] 
      self.save() 

    def __iter__(self): 
     """ 
     Iteracja przez elementy na zakupy i pobranie z bazy danych 
     """ 

     product_ids = self.cart.keys() 
     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 __len__(self): 
     """ 
     Obliczanie liczby wszytskich elementów w koszyku. 
     """ 
     return sum(item['quantity'] for item in self.cart.values()) 

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

    def clear(self): 
     # usunięcie koszyka 
     del self.session[settings.CART_SESSION_ID] 
     self.session.modified = True 

接下來，我創建的文件（forms.py），並添加以下代碼：

from django import forms 

PRODUCT_QUANTITY_CHOICES = [(i, str(i)) for i in range(1, 21)] 

SIZE_CHOICES = (
    ('S', 'S'), 
    ('M', 'M'), 
    ('L', 'L'), 
    ('XL', 'XL') 
) 


class CartAddProductForm(forms.Form): 
    quantity = forms.TypedChoiceField(
           choices=PRODUCT_QUANTITY_CHOICES, 
           coerce=int) 
    update = forms.BooleanField(required=False, 
           initial=False, 
           widget=forms.HiddenInput) 
    sz = forms.MultipleChoiceField(
     required=True, 
     widget=forms.RadioSelect, 
     choices=SIZE_CHOICES, 
     initial=False) 

我的下一個步驟是創建視圖

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'], 
       size=cd['size'], 
       upd_size=['sz']) 
    return redirect('cart:cart_detail') 


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, 
           'size': item['size'], 
           'sz': True} 
     ) 
    return render(request, 
        'cart/detail.html', 
        {'cart': cart}) 

和last is th detail.html in cart app：

{% extends "shop/base.html" %} 
{% load static %} 

{% block title %}{{ product.name }}{% endblock %} 
{% block content %} 
<div class="container-fluid"> 
    <div class="row"> 
     {% for item in cart %} 
      {% with product=item.product %} 
       <div class="col-md-2"> 
        <a href="{{ product.get_absolute_url }}"> 
         <img src="{{ product.image_url }}" class="img-responsive"> 
        </a> 
       </div> 
       {{product.name}} 
       <form action="{% url 'cart:cart_add' product.id %}" method="post"> 
        {{ item.update_quantity_form.quantity }} 
        {{ item.update_quantity_form.update }} 
        <input type="submit" value="Zmień"> 
        {% csrf_token %} 
       </form> 
       {{ item.quantity }} 
       {{ item.size }} 
       <a href="{% url 'cart:cart_remove' product.id%}">Usuń</a> 
       {{item.price}} 
       {{item.total_price}} 
      {% endwith %} 
     {% endfor %} 
     {{cart.get_total_price}} 

     <a href="{% url 'orders:order_create' %}"> 
      Do kasy 
     </a> 
    </div> 
</div> 
{% endblock %} 

我在poduct detail.html中添加表單以將產品添加到購物車中。

怎麼回事？ 當我點擊添加到購物車移動到cart/detail.html，但沒有顯示。 當我刪除evrything大小的工作很好，並顯示我的產品在cart/detail.html沒有大小，但我需要它。我如何解決它？

Answer 1

您的意見中存在拼寫錯誤。

應該有CD [ '深圳']，不是[ '深圳']

現在是：

if form.is_valid(): 
    cd = form.cleaned_data 
    cart.add(product=product, 
      quantity=cd['quantity'], 
      update_quantity=cd['update'], 
      size=cd['size'], 
      upd_size=['sz']) 
return redirect('cart:cart_detail') 

應該

if form.is_valid(): 
    cd = form.cleaned_data 
    cart.add(product=product, 
      quantity=cd['quantity'], 
      update_quantity=cd['update'], 
      size=cd['size'], 
      upd_size=cd['sz']) 
return redirect('cart:cart_detail')