我添加了代码以启用购物车上的删除选项。出现以下错误。
与“remove_cart_item”相反，未找到参数“(2,)”。尝试了 1 个模式：['cart/remove_cart_item/(?P
cart.html
{% extends 'base.html' %}
{% load static %}
{% block content %}
<!-- ============================ COMPONENT 1 ================================= -->
{% if not cart_items%}
<h2 class="text-center">Your shopping cart is empty</h2>
<br>
<div class="text-center">
<a href="{% url 'store' %}" class="btn btn-primary">Continue Shopping</a>
</div>
{% else %}
<div class="row">
<aside class="col-lg-9">
<div class="card">
<table class="table table-borderless table-shopping-cart">
<thead class="text-muted">
<tr class="small text-uppercase">
<th scope="col">Product</th>
<th scope="col" width="120">Quantity</th>
<th scope="col" width="120">Price</th>
<th scope="col" class="text-right" width="200"> </th>
</tr>
</thead>
<tbody>
<tr>
{% for cart_item in cart_items %}
<td>
<figure class="itemside align-items-center">
<div class="aside"><img src="{{ cart_item.product.images.url }}" class="img-sm"></div>
<figcaption class="info">
<a href="{{ cart_item.product.get_url }}" class="title text-dark">{{cart_item.product.product_name}}</a>
<p class="text-muted small">
{% if cart_item.variations.all %}
{% for item in cart_item.variations.all %}
{{item.variation_category |capfirst }} : {{item.variation_value | capfirst}} <br>
{% endfor %}
{% endif %}
</p>
</figcaption>
</figure>
</td>
<td>
<!-- col.// -->
<div class="col">
<div class="input-group input-spinner">
<div class="input-group-prepend">
<a href="{% url 'remove_cart' cart_item.product.id cart_item.id %}" class="btn btn-light" type="button" id="button-plus"> <i class="fa fa-minus"></i> </a>
</div>
<input type="text" class="form-control" value="{{cart_item.quantity}}">
<div class="input-group-append">
<form action="{% url 'add_cart' cart_item.product.id %}" method="POST">
{% csrf_token %}
{% for item in cart_item.variations.all %}
<input type="hidden" name="{{item.variation_category | lower}}" value="{{item.variation_value | capfirst}}">
{% endfor %}
<button class="btn btn-light" type="submit" id="button-minus"> <i class="fa fa-plus"></i> </button>
</form>
</div>
</div> <!-- input-group.// -->
</div> <!-- col.// -->
</td>
<td>
<div class="price-wrap">
<var class="price">${{cart_item.sub_total}}</var>
<small class="text-muted"> ${{cart_item.product.price}} each</small>
</div> <!-- price-wrap .// -->
</td>
<td class="text-right">
<a href="{% url 'remove_cart_item' cart_item.product.id cart_item.id %}" class="btn btn-danger"> Remove</a>
</td>
</tr>
{% endfor %}
</tbody>
</table>
</div> <!-- card.// -->
</aside> <!-- col.// -->
<aside class="col-lg-3">
<div class="card">
<div class="card-body">
<dl class="dlist-align">
<dt>Total price:</dt>
<dd class="text-right">{{total}}</dd>
</dl>
<dl class="dlist-align">
<dt>Tax:</dt>
<dd class="text-right"> {{tax}}</dd>
</dl>
<dl class="dlist-align">
<dt>Grand Total:</dt>
<dd class="text-right text-dark b"><strong>${{grand_total}}</strong></dd>
</dl>
<hr>
<p class="text-center mb-3">
<img src="{% static './images/misc/payments.png' %}" height="26">
</p>
<a href="./place-order.html" class="btn btn-primary btn-block"> Checkout </a>
<a href="{% url 'store' %}" class="btn btn-light btn-block">Continue Shopping</a>
</div> <!-- card-body.// -->
</div> <!-- card.// -->
</aside> <!-- col.// -->
</div> <!-- row.// -->
{% endif %}
<!-- ============================ COMPONENT 1 END .// ================================= -->
</div> <!-- container .// -->
</section>
<!-- ========================= SECTION CONTENT END// ========================= -->
{% endblock %}
购物车应用程序的 urls.py 文件
urlpatterns = [
path('', views.cart, name='cart'),
path('add_cart/<int:product_id>/', views.add_cart, name='add_cart'),
path('remove_cart/<int:product_id>/<int:cart_item_id>/', views.remove_cart, name='remove_cart'),
path('remove_cart_item/<int:product_id>/<int:cart_item_id>/', views.remove_cart_item, name='remove_cart_item'),
]
购物车应用程序的views.py文件
# Create your views here.
def _cart_id(request):
cart = request.session.session_key
if not cart:
cart = request.session.create()
return cart
def add_cart(request, product_id):
product = Product.objects.get(id=product_id) #get the product
product_variation = []
if request.method=='POST':
for item in request.POST:
key=item
value=request.POST[key]
try:
variation=Variation.objects.get(product=product, variation_category__iexact=key, variation_value__iexact=value)
product_variation.append(variation)
except:
pass
try:
cart = Cart.objects.get(cart_id = _cart_id(request)) #get the cart using the cart_id present in the session
except Cart.DoesNotExist:
cart = Cart.objects.create(
cart_id = _cart_id(request)
)
cart.save()
is_cart_item_exists = CartItem.objects.filter(product=product, cart=cart).exists()
if is_cart_item_exists:
cart_item = CartItem.objects.filter(product=product, cart=cart)
# existing_variations ->database
# current_variations -> product_variation
# item_id -> database
ex_var_list = []
id = []
for item in cart_item:
existing_variation = item.variations.all()
ex_var_list.append(list(existing_variation))
id.append(item.id)
print(ex_var_list)
if product_variation in ex_var_list:
# increase the cart item quantity
index = ex_var_list.index(product_variation)
item_id = id[index]
item = CartItem.objects.get(product=product, id=item_id)
item.quantity += 1
item.save()
else:
# create a new cart item
item = CartItem.objects.create(product=product, quantity=1, cart=cart)
if len(product_variation) > 0:
item.variations.clear()
item.variations.add(*product_variation)
item.save()
else:
cart_item = CartItem.objects.create(
product = product,
quantity = 1,
cart = cart,
)
if len(product_variation) > 0:
cart_item.variations.clear()
cart_item.variations.add(*product_variation)
cart_item.save()
return redirect('cart')
def remove_cart(request, product_id, cart_item_id):
cart = Cart.objects.get(cart_id = _cart_id(request))
product = get_object_or_404(Product, id=product_id)
try:
cart_item = CartItem.objects.get(product = product, cart = cart, id=cart_item_id)
if cart_item.quantity > 1:
cart_item.quantity -= 1
cart_item.save()
else:
cart_item.delete()
except:
pass
return redirect('cart')
def remove_cart_item(request, product_id, cart_item_id):
cart = Cart.objects.get(cart_id = _cart_id(request))
product = get_object_or_404(Product, id=product_id)
cart_item = CartItem.objects.get(product = product, cart = cart, id=cart_item_id)
cart_item.delete()
return redirect('cart')
def cart(request, total=0, quantity=0, cart_items= None):
try:
tax = 0
grand_total = 0
cart = Cart.objects.get(cart_id = _cart_id(request))
cart_items = CartItem.objects.filter(cart=cart, is_active=True)
for cart_item in cart_items:
total += (cart_item.product.price * cart_item.quantity)
quantity += cart_item.quantity
tax = (total * 2) / 100
grand_total = total + tax
except ObjectDoesNotExist:
pass # just ignore
context = {
'total': total,
'quantity': quantity,
'cart_items': cart_items,
'tax': tax,
'grand_total': grand_total,
}
return render(request, 'store/cart.html', context)
def __str__(self):
return self.cart_item
跟踪堆栈
Internal Server Error: /cart/
Traceback (most recent call last):
File "C:\Users\user\OneDrive - Education Department, Government of Punjab\Desktop\Django demos\GreatKart\env\Lib\site-packages\django\core\handlers\exception.py", line 47, in inner
response = get_response(request)
^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\user\OneDrive - Education Department, Government of Punjab\Desktop\Django demos\GreatKart\env\Lib\site-packages\django\core\handlers\base.py", line 179, in _get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\user\OneDrive - Education Department, Government of Punjab\Desktop\Django demos\GreatKart\carts\views.py", line 124, in cart
return render(request, 'store/cart.html', context)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\user\OneDrive - Education Department, Government of Punjab\Desktop\Django demos\GreatKart\env\Lib\site-packages\django\shortcuts.py", line 19, in render
content = loader.render_to_string(template_name, context, request, using=using)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\user\OneDrive - Education Department, Government of Punjab\Desktop\Django demos\GreatKart\env\Lib\site-packages\django\template\loader.py", line 62, in render_to_string
return template.render(context, request)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\user\OneDrive - Education Department, Government of Punjab\Desktop\Django demos\GreatKart\env\Lib\site-packages\django\template\backends\django.py", line 61, in render
return self.template.render(context)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\user\OneDrive - Education Department, Government of Punjab\Desktop\Django demos\GreatKart\env\Lib\site-packages\django\template\base.py", line 170, in render
return self._render(context)
^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\user\OneDrive - Education Department, Government of Punjab\Desktop\Django demos\GreatKart\env\Lib\site-packages\django\template\base.py", line 162, in _render
return self.nodelist.render(context)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\user\OneDrive - Education Department, Government of Punjab\Desktop\Django demos\GreatKart\env\Lib\site-packages\django\template\base.py", line 938, in render
bit = node.render_annotated(context)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\user\OneDrive - Education Department, Government of Punjab\Desktop\Django demos\GreatKart\env\Lib\site-packages\django\template\base.py", line 905, in render_annotated
return self.render(context)
^^^^^^^^^^^^^^^^^^^^
File "C:\Users\user\OneDrive - Education Department, Government of Punjab\Desktop\Django demos\GreatKart\env\Lib\site-packages\django\template\loader_tags.py", line 150, in render
return compiled_parent._render(context)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\user\OneDrive - Education Department, Government of Punjab\Desktop\Django demos\GreatKart\env\Lib\site-packages\django\template\base.py", line 162, in _render
return self.nodelist.render(context)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\user\OneDrive - Education Department, Government of Punjab\Desktop\Django demos\GreatKart\env\Lib\site-packages\django\template\base.py", line 938, in render
bit = node.render_annotated(context)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\user\OneDrive - Education Department, Government of Punjab\Desktop\Django demos\GreatKart\env\Lib\site-packages\django\template\base.py", line 905, in render_annotated
return self.render(context)
^^^^^^^^^^^^^^^^^^^^
File "C:\Users\user\OneDrive - Education Department, Government of Punjab\Desktop\Django demos\GreatKart\env\Lib\site-packages\django\template\loader_tags.py", line 62, in render
result = block.nodelist.render(context)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\user\OneDrive - Education Department, Government of Punjab\Desktop\Django demos\GreatKart\env\Lib\site-packages\django\template\base.py", line 938, in render
bit = node.render_annotated(context)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\user\OneDrive - Education Department, Government of Punjab\Desktop\Django demos\GreatKart\env\Lib\site-packages\django\template\base.py", line 905, in render_annotated
return self.render(context)
^^^^^^^^^^^^^^^^^^^^
File "C:\Users\user\OneDrive - Education Department, Government of Punjab\Desktop\Django demos\GreatKart\env\Lib\site-packages\django\template\defaulttags.py", line 312, in render
return nodelist.render(context)
^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\user\OneDrive - Education Department, Government of Punjab\Desktop\Django demos\GreatKart\env\Lib\site-packages\django\template\base.py", line 938, in render
bit = node.render_annotated(context)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\user\OneDrive - Education Department, Government of Punjab\Desktop\Django demos\GreatKart\env\Lib\site-packages\django\template\base.py", line 905, in render_annotated
return self.render(context)
^^^^^^^^^^^^^^^^^^^^
File "C:\Users\user\OneDrive - Education Department, Government of Punjab\Desktop\Django demos\GreatKart\env\Lib\site-packages\django\template\defaulttags.py", line 211, in render
nodelist.append(node.render_annotated(context))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\user\OneDrive - Education Department, Government of Punjab\Desktop\Django demos\GreatKart\env\Lib\site-packages\django\template\base.py", line 905, in render_annotated
return self.render(context)
^^^^^^^^^^^^^^^^^^^^
File "C:\Users\user\OneDrive - Education Department, Government of Punjab\Desktop\Django demos\GreatKart\env\Lib\site-packages\django\template\defaulttags.py", line 446, in render
url = reverse(view_name, args=args, kwargs=kwargs, current_app=current_app)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\user\OneDrive - Education Department, Government of Punjab\Desktop\Django demos\GreatKart\env\Lib\site-packages\django\urls\base.py", line 87, in reverse
return iri_to_uri(resolver._reverse_with_prefix(view, prefix, *args, **kwargs))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\user\OneDrive - Education Department, Government of Punjab\Desktop\Django demos\GreatKart\env\Lib\site-packages\django\urls\resolvers.py", line 685, in _reverse_with_prefix
raise NoReverseMatch(msg)
django.urls.exceptions.NoReverseMatch: Reverse for 'remove_cart_item' with arguments '(2,)' not found. 1 pattern(s) tried: ['cart/remove_cart_item/(?P<product_id>[0-9]+)/(?P<cart_item_id>[0-9]+)/$']
在 urls.py 中，remove_cart_item 路径被定义为需要两个参数：product_id 和 cart_item_id
path('remove_cart_item/<int:product_id>/<int:cart_item_id>/', views.remove_cart_item, name='remove_cart_item')
错误表明函数需要两个参数，但得到了 0，所以你应该像这样传递参数来解决错误：
<a href="{% url 'remove_cart_item' product_id=cart_item.product.id cart_item_id=cart_item.id %}" class="btn btn-danger"> Remove</a>
此语法显式匹配 urls.py 文件中定义的参数，确保它们正确传递。
如果错误无法解决，请通过打印查看productid和cart id的值
print(cart_item.id)