建议一种在单击按钮时填充数据库的方法

Question

我是一个新手Django程序员，试图建立一个基本的电子商务网站。我想通过按"添加到购物车"按钮将所选项目添加到数据库并加载相同的主页。单击此按钮时出现错误：MultiValueDictKeyError at/"add_cart"如果需要，请建议任何其他好方法

我的按钮模板是：

<form action="get">
                <button 
                type="submit" 
                class="button1" 
                value="{{ product.id }}" 
                name="add_cart">Add to Cart
        </button>
</form>

views.py：

def home(request):
    products = Products.objects
    product_id=None
    if request.method == "POST":
        product_id = request.POST['add_cart']
    if product_id:
        product = Products.objects.get(id=int(product_id))
        if product:
            product.c_title =product.title
            product.c_description = product.description
            product.c_price = product.price
            product.customer = request.user 
            product.save()
        return redirect(request, 'products/home.html',{'products': products})
    return render(request, 'products/home.html',{'products': products})

models.py在这里，我在用于存储该用户的购物车物品的项目中使用了"c_"前缀

class Products(models.Model):
    title = models.CharField(max_length = 100)
    body = models.TextField()
    description = models.TextField()
    price = models.IntegerField()
    image = models.ImageField(upload_to = 'images/')
    customer = models.ForeignKey(User, on_delete = models.CASCADE)
    total_items = models.IntegerField(default = 1)
    icon =  models.ImageField(upload_to = 'images/')
    c_title = models.CharField(max_length = 100)
    c_description = models.TextField()
    c_price = models.IntegerField()
    c_total_items = models.IntegerField(default = 1)

urls.py

from django.contrib import admin
from django.urls import path, include
from django.conf import settings
from django.conf.urls.static import static
from products import views as product_views
urlpatterns =[
    path('admin/', admin.site.urls),
    # path('', include('products.urls')),
    path('', product_views.home,name='home'),
    path('accounts/', include('accounts.urls')),
    path('cart/', include('cart.urls'))
] + static(settings.MEDIA_URL, document_root = settings.MEDIA_ROOT)

Answer 1

你应该使用action="post"，检查方法等于"POST"，并从request.POST获取数据。