无法使用 Django 信号创建卖家实例

Question

我正在构建一个有 2 种用户类型的网站，并且对 django 还是个新手。而且我想添加功能以在销售产品时添加产品的卖家。对不起，我无法更好地解释它。这是models.py的代码：

class Ordered(models.Model):
    products = models.ForeignKey(Products, on_delete = models.SET_NULL, null = True)
    seller = models.ForeignKey(SellerProfile, on_delete = models.SET_NULL, null = True)
    buyer = models.ForeignKey(CustomerProfile, on_delete = models.CASCADE)
    ordered_on = models.DateTimeField(auto_now_add = True)

product/models.py

class Products(models.Model):
    seller = models.ForeignKey(SellerProfile, on_delete = models.CASCADE)
    title = models.CharField(max_length = 255)
    product_category = models.CharField(choices = CATEGORY_CHOICES, max_length = 100, default = 'eBooks')
    description = models.TextField()
    files = models.FileField(upload_to = 'media/product_files/', null = True)
    slug = models.SlugField(max_length = 255, unique = True, null = True, blank = True)

这是信号代码：

@receiver(post_save, sender = Ordered)
def new_order_for_seller(sender, instance, created, *args, **kwargs):
    seller = Ordered.seller.sellerprofile
    if created:
        Ordered.objects.create(seller = seller)

对代码的任何建议或更正都会非常有帮助。谢谢

Answer 1

您可以将 seller 属性设置为 instance.product.seller:

@receiver(pre_save, sender = Ordered)
def new_order_for_seller(sender, instance, created, *args, **kwargs):
    if created and instance.product is not None:
        instance<strong>.seller_id</strong> = instance<strong>.product.seller_id</strong>

我们可以在 pre_save 信号中执行此操作，以防止再次保存新的 Ordered 对象。

也就是说，由于卖家已经由 Product 确定，因此复制它没有多大意义，因为它最终会导致 Seller 的不一致 Product 稍后更改，Ordered 仍指向“旧”Seller。

无法使用 Django 信号创建卖家实例

Failed to create a seller instance using django signals

django

django-signals

django-models