Django KeyError： 'サイズ'

Question

カートに商品を追加しようとするとこのエラーが発生します。サイズがなければこの作品が必要ですがサイズが必要です。だから私はそれを修正するために何をすることができますか？

February 11, 2017 - 12:04:30 
Django version 1.10.5, using settings 'villain.settings' 
Starting development server at http://127.0.0.1:8000/ 
Quit the server with CONTROL-C. 
[11/Feb/2017 12:04:41] "GET /8/koszulka-moro/ HTTP/1.1" 200 3624 
Internal Server Error: /cart/add/8/ 
Traceback (most recent call last): 
    File "/home/krystian/.virtualenvs/vpw/lib/python3.5/site-packages/django/core/handlers/exception.py", line 39, in inner 
    response = get_response(request) 
    File "/home/krystian/.virtualenvs/vpw/lib/python3.5/site-packages/django/core/handlers/base.py", line 187, in _get_response 
    response = self.process_exception_by_middleware(e, request) 
    File "/home/krystian/.virtualenvs/vpw/lib/python3.5/site-packages/django/core/handlers/base.py", line 185, in _get_response 
    response = wrapped_callback(request, *callback_args, **callback_kwargs) 
    File "/home/krystian/.virtualenvs/vpw/lib/python3.5/site-packages/django/views/decorators/http.py", line 40, in inner 
    return func(request, *args, **kwargs) 
    File "/home/krystian/Project/villain/villain/cart/views.py", line 19, in cart_add 
    update_size=cd['size_update'] 
    File "/home/krystian/Project/villain/villain/cart/cart.py", line 34, in add 
    self.cart[product_id]['size'] += size 
KeyError: 'size' 

これII私の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, update_size=False, size=None): 
     """ 
     Dodanie produktu i zmiana ilości 
     """ 
     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 
     if update_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 

が、これはこれは、私はそれを修正しようと、私のviews.py

@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'], 
       update_size=cd['size_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}) 
     item['update_size_form'] = CartAddProductForm(
         initial={'size': item['size'], 
           'size_update': True} 
     ) 
    return render(request, 
        'cart/detail.html', 
        {'cart': cart}) 

ある

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) 
    size = forms.TypedChoiceField(
           choices=SIZE_CHOICES) 
    size_update = forms.BooleanField(required=False, 
            initial=False, 
            widget=forms.HiddenInput) 

私forms.pyです私のすべてのattepmtsは動作しません。

Answer 1

数量と価格だけで製品辞書を初期化します。サイズを更新できるようにするには、その初期化でsizeの値を含める必要があります。