【发布时间】：2020-06-29 15:25:24
【问题描述】：
我已经为具有变体 s、m 和 l 的项目创建了一个模型，当我从产品详细信息页面添加具有不同变体的相同项目（例如 item1 尺寸小和 item1 尺寸中等）时，它会正确添加数量使用产品详细信息页面中的 post 方法为每个具有不同变体到订单摘要页面的项目。
现在在“订单摘要”页面中，当我尝试添加或删除具有变体的商品时，它只会更新到添加的第一个商品，因为它反映的是 item.slug 而不是商品变体。
要重新澄清添加具有不同变体的相同项目工作正常，除了在模板订单 summary.html 中有一个带有 href 的标签添加到购物车并从购物车中删除单个项目，我认为这是问题的原因不将数量更新到变体而是更新到 item.slug，添加到购物车不是读取变体。我在视图和模板中绘制了我认为错误原因的箭头。
我也尝试在 order.summary.html 模板中添加 post 方法，但没有成功。 （我这样做的原因是我通过 post 方法从产品详细信息模板中添加了项目变体，我也尝试过这样做，如下图所示）
为了更好地澄清这里是models.py
class Item(models.Model):
designer = models.ForeignKey(User, on_delete=models.CASCADE)
title = models.CharField(max_length=100)
slug = models.SlugField(unique=True)
def __str__(self):
return self.title
def get_absolute_url(self):
return reverse("core:product", kwargs={'slug': self.slug})
def get_add_to_cart_url(self):
return reverse("core:add-to-cart", kwargs={'slug': self.slug})
def get_remove_from_cart_url(self):
return reverse("core:remove-from-cart", kwargs={'slug': self.slug})
class VariationManager(models.Manager):
def all(self):
return super(VariationManager, self).filter(active=True)
def sizes(self):
return self.all().filter(category='size')
VAR_CATEGORIES = (('size', 'size',),)
class Variation(models.Model):
item = models.ForeignKey(Item, on_delete=models.CASCADE)
category = models.CharField(
max_length=120, choices=VAR_CATEGORIES, default='size')
title = models.CharField(max_length=120)
objects = VariationManager()
def __str__(self):
return self.title
class OrderItem(models.Model):
user = models.ForeignKey(settings.AUTH_USER_MODEL,
on_delete=models.CASCADE)
item = models.ForeignKey(Item, on_delete=models.CASCADE)
quantity = models.IntegerField(default=1)
variation = models.ManyToManyField(Variation)
def __str__(self):
return f"{self.quantity} of {self.item.title}"
这里是views.py
class OrderSummaryView(LoginRequiredMixin, View):
def get(self, *args, **kwargs):
try:
order = Order.objects.get(user=self.request.user, ordered=False)
context = {
'object': order
}
return render(self.request, 'order_summary.html', context)
except ObjectDoesNotExist:
messages.warning(self.request, "You do not have an active order")
return redirect("/")
@login_required
def add_to_cart(request, slug):
item = get_object_or_404(Item, slug=slug)
order_item_qs = OrderItem.objects.filter(
item=item,
user=request.user,
ordered=False
)
item_var = [] # item variation
if request.method == 'POST':
for items in request.POST:
key = items
val = request.POST[key]
try:
v = Variation.objects.get(
item=item,
category__iexact=key,
title__iexact=val
)
item_var.append(v)
except:
pass
if len(item_var) > 0:
for items in item_var:
order_item_qs = order_item_qs.filter(
variation__exact=items,
)
if order_item_qs.exists():
order_item = order_item_qs.first()
order_item.quantity += 1
order_item.save()
else:
order_item = OrderItem.objects.create(
item=item,
user=request.user,
ordered=False
)
order_item.variation.add(*item_var) <------------- this line is not read in the template
order_item.save()
order_qs = Order.objects.filter(user=request.user, ordered=False)
if order_qs.exists():
order = order_qs[0]
# check if the order item is in the order
if not order.items.filter(item__id=order_item.id).exists():
order.items.add(order_item)
messages.info(request, "This item quantity was updated.")
return redirect("core:order-summary")
else:
ordered_date = timezone.now()
order = Order.objects.create(
user=request.user, ordered_date=ordered_date)
order.items.add(order_item)
messages.info(request, "This item was added to cart.")
return redirect("core:order-summary")
@login_required
def remove_single_item_from_cart(request, slug):
item = get_object_or_404(Item, slug=slug)
order_qs = Order.objects.filter(
user=request.user,
ordered=False
)
if order_qs.exists():
order = order_qs[0]
# check if the order item is in the order
if order.items.filter(item__slug=item.slug).exists():
order_item = OrderItem.objects.filter(
item=item,
user=request.user,
ordered=False
)[0]
if order_item.quantity > 1:
order_item.quantity -= 1
order_item.save()
else:
order.items.remove(order_item)
messages.info(request, "This item quantity was updated")
return redirect("core:order-summary")
else:
messages.info(request, "This item was not in your cart")
return redirect("core:product", slug=slug)
else:
messages.info(request, "You do not have an active order")
return redirect("core:product", slug=slug)
这是导致问题的模板：
{% extends "base.html"%}
{% block content %}
<h2> Order Summary</h2>
<table class="table">
<thead>
<tr>
<th scope="col">#</th>
<th scope="col">Item Title</th>
<th scope="col">Price</th>
<th scope="col">Quantity</th>
<th scope="col">Size</th>
<th scope="col">Total Item Price</th>
</tr>
</thead>
<tbody>
{% for order_item in object.items.all %}
<tr>
<th scope="row">{{ forloop.counter }}</th>
<td>{{ order_item.item.title }}</td>
<td>{{ order_item.item.price }}</td>
<td
<a href="{% url 'core:remove-single-item-from-cart' order_item.item.slug %}"><i class="fas fa-minus mr-2"></a></i> <------------------------------issue is with this line
{{ order_item.quantity }}
<a href="{% url 'core:add-to-cart' order_item.item.slug %}"><i class="fas fa-plus ml-2"></a></i> <------------------------------issue is with this line
</td>
<td>
{% if order_item.variation.all %}
{% for variation in order_item.variation.all %}
{{ variation.title|capfirst }}
{% endfor %}
{% endif %}
</td>
</tr>
</tbody>
</table>
</div>
</div>
{% endblock content %}
我尝试在模板中写一个 post 方法而不是 a href 但它不起作用，这是我尝试过的
<form method="POST" action="{{ item.get_add_to_cart_url }}">
{% csrf_token %}
<a href="{% url 'core:add-to-cart' order_item.item.slug %}"><i class="fas fa-plus ml-2"></a></i>
</form>
【问题讨论】：
标签： python django django-templates