表单未与{％csrf_token％} {{cart_product_form}} Django一起显示

Question

因此，我正在尝试为电子商务网站显示Django 2.x（最新版本）的下拉菜单，该菜单允许您在添加到购物车之前选择商品的数量，但数量表格未显示。我有一个商店应用程序和一个购物车应用程序，该表格在购物车应用程序中。看起来像这样：

如何显示它？

html

<form action="{% url "cart:cart_add" product.id %}" method="post">
    {% csrf_token %}
    {{ cart_product_form }}
    <input type="submit" value="add to cart" class="btn btn-primary">
</form>

以下是开发工具的外观：  Dev Tools for the form

商店views.py

from django.shortcuts import render, get_object_or_404
from .models import Category, Product
from cart.forms import CartAddProductForm
from django.template import RequestContext

def product_list(request, category_slug=None):
    category = None
    categories = Category.objects.all()
    products = Product.objects.filter(available=True)
    if category_slug:
        category = get_object_or_404(Category, slug=category_slug)
        products = Product.objects.filter(category=category)

    context = {
        'category': category,
        'categories': categories,
        'products': products
    }
    return render(request, 'shop/product/list.html', context)


def product_detail(request, id, slug):
    product = get_object_or_404(Product, id=id, slug=slug, available=True)
    cart_product_form = CartAddProductForm()
    context = {
        'product': product,
        'cart_product_form': cart_product_form
    }
    return render(request, 'shop/product/detail.html', context)

商店urls.py

from django.conf.urls import re_path
from . import views

app_name = 'shop'

urlpatterns = [
    re_path(r'^$', views.product_list, name='product_list'),
    re_path(r'^(?P<category_slug>[-\w]+)/$', views.product_list, name='product_list_by_category'),
    re_path(r'^(?P<id>\d+)/(?P<slug>[-\w]+)/$', views.product_detail, name='product_detail'),
]

购物车表格。py

from django import forms

PRODUCT_QUANTITY_CHOICES = [(i, str(i)) for i in range(1, 26)]

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

购物车.py

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


class Cart(object):
    def __init__(self, request):
        self.session = request.session
        cart = self.session.get(settings.CART_SESSION_ID)
        if not cart:
            cart = self.session[settings.CART_SESSION_ID] = {}
        self.cart = cart

    def add(self, product, quantity=1, update_quantity=False):
        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 save(self):
        self.session[settings.CART_SESSION_ID] = self.cart
        self.session.modified = True

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

    def __iter__(self):
        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):
        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):
        del self.session[settings.CART_SESSION_ID]
        self.session.modified = True

购物车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('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})
    return render(request, 'cart/detail.html', {'cart': cart})