Question

我正在使用网上商店应用。我需要从m2m字段中获取单个项目，以便可以对其进行迭代并获得单个attirbutes（例如图像等）。感谢您的帮助

class Item(models.Model):
    title = models.CharField(max_length=100)
    price = models.FloatField()
    image = models.ImageField(default='default.jpg', upload_to='product_pics')

class OrderItem(models.Model):
    user = models.ForeignKey(settings.AUTH_USER_MODEL, 
             on_delete=models.CASCADE, blank=True, null=True)
    item = models.ForeignKey(Item, on_delete=models.CASCADE, 
             related_name="order_item")
    quantity = models.IntegerField(default=1)
    ordered = models.BooleanField(default=False)

class Order(models.Model):
    user = models.ForeignKey(settings.AUTH_USER_MODEL, 
              on_delete=models.CASCADE)
    items = models.ManyToManyField(OrderItem, related_name="orders")
    start_date = models.DateTimeField(auto_now_add=True)
    ordered = models.BooleanField(default=False)



#VIEWS

def cart_items(request):
    all_items = Item.objects.filter(order_item__orders_user=request.user) 
    if all_items.exists():
        context = {
            "items":all_items
        }
        return render(request, "shop/cart.html", context)
    return redirect("profile")


#template loop

for item in items:
    item.image

Answer 1

您需要更改Alt+Shift+L字段以将items用作穿透表docs

OrderItem

然后您可以为这样的用户获取最新订单的所有商品

items = models.ManyToManyField(Item, through=OrderItem, related_name="orders")

如何从ManyToMany字段中获取特定内容

1 个答案: