Question

请在我的回答被标记为重复之前，如果有人先通过它，我将不胜感激。我试图访问电子商务项目中的产品页面，但当我尝试访问该页面时，我收到如下错误值：

Internal Server Error: /product_view/1/
Traceback (most recent call last):
  File "/home/agozie/anaconda3/envs/env1/lib/python2.7/site-packages/django/core/handlers/exception.py", line 41, in inner
    response = get_response(request)
  File "/home/agozie/anaconda3/envs/env1/lib/python2.7/site-packages/django/core/handlers/base.py", line 187, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "/home/agozie/anaconda3/envs/env1/lib/python2.7/site-packages/django/core/handlers/base.py", line 185, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/home/agozie/shoppingmall/shop/views.py", line 15, in product_view
    p = get_object_or_404(Product, product_slug)
  File "/home/agozie/anaconda3/envs/env1/lib/python2.7/site-packages/django/shortcuts.py", line 85, in get_object_or_404
    return queryset.get(*args, **kwargs)
  File "/home/agozie/anaconda3/envs/env1/lib/python2.7/site-packages/django/db/models/query.py", line 371, in get
    clone = self.filter(*args, **kwargs)
  File "/home/agozie/anaconda3/envs/env1/lib/python2.7/site-packages/django/db/models/query.py", line 784, in filter
    return self._filter_or_exclude(False, *args, **kwargs)
  File "/home/agozie/anaconda3/envs/env1/lib/python2.7/site-packages/django/db/models/query.py", line 802, in _filter_or_exclude
    clone.query.add_q(Q(*args, **kwargs))
  File "/home/agozie/anaconda3/envs/env1/lib/python2.7/site-packages/django/db/models/sql/query.py", line 1250, in add_q
    clause, _ = self._add_q(q_object, self.used_aliases)
  File "/home/agozie/anaconda3/envs/env1/lib/python2.7/site-packages/django/db/models/sql/query.py", line 1276, in _add_q
    allow_joins=allow_joins, split_subq=split_subq,
  File "/home/agozie/anaconda3/envs/env1/lib/python2.7/site-packages/django/db/models/sql/query.py", line 1151, in build_filter
    arg, value = filter_expr
ValueError: need more than 1 value to unpack
[13/Aug/2017 19:07:23] "GET /product_view/1/ HTTP/1.1" 500 104231

我已经解决了与我有关的所有其他问题，但它们都与拆分代码有关。

这是我的models.py：

class Product(models.Model):
    name = models.CharField(max_length=50)
    slug = models.SlugField(max_length=50, unique=True)
    color_id = models.ManyToManyField(Color)
    gender = models.CharField(max_length=2,choices=(('M','Male'),('F','Female')))
    brand_id = models.ManyToManyField(Brand)
    image = models.ImageField(upload_to='product_images',blank=False)
    features = models.TextField()
    quantity = models.IntegerField(default=0)
    style = models.ManyToManyField(Style)
    sub_category_id = models.ForeignKey(Sub_Category)
    old_price = models.DecimalField(max_digits=15, decimal_places=2, blank=True, default=0.00)
    price = models.DecimalField(max_digits=15,decimal_places=2, null=False)
    availability = models.BooleanField(default=False)
    retailer_id = models.ForeignKey(Retailer)
    shipping_cost= models.IntegerField(default=1000)
    categories = models.ManyToManyField(Category)
    created_at = models.DateTimeField(auto_now=True)

    def save(self, *args, **kwargs):
        # self.author = self.author.upper()
        self.slug = slugify(self.name)
        super(Product, self).save(*args,**kwargs)

    def __str__(self):
        return self.name

    @models.permalink
    def get_absolute_url(self):
        return('shop_product', (), {'product_slug':'self.slug'})

    def sale_price(self):
        if self.old_price > self.price:
            return self.price
        else:
            return None

以下是我的views.py：

def product_view(request, product_slug):
    p = get_object_or_404(Product, product_slug)
    categories = p.categories.filter(is_active=True)
    return render(request,'shop/product_view.html')

我正在使用Django 1.11和Python 2.7.13

Answer 1

我认为您正在尝试在网址中找到Product的{{1}}，对吧？

product_slug是查找由其字段过滤的对象的正确方法。

p = get_object_or_404(Product, slug=product_slug)要求您传递除类模型以外的任何参数，以便get_object_or_404或get()方法接受。

Answer 2

如the docs所述，get_object_or_404接受klass作为第一个参数，然后*args, **kwargs（其中klass和kwargs需要）

因此，当您调用此函数时，您需要指定keyword arguments来获取：

p = get_object_or_404(Product, slug=product_slug)

因为Django不知道通过哪个字段获取您的Product模型，这就是您收到ValueError: need more than 1 value to unpack的原因。

django值错误需要多个值才能解压缩

2 个答案: