django值错误需要多个值才能解压

请在我的答案被标记为重复之前，如果有人先通过它，我将不胜感激。我试图在电子商务项目中访问产品页面，但是当我尝试访问的页面，我得到的值如下错误：django值错误需要多个值才能解压

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

我已经经历了所有其他问题，有关我的，但他们都已经走与分割代码有关。

这里是我的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

而下面是我的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')

我使用Django 1.11和Python 2.7.13

来源

2017-08-13 Gozie

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

所以，当你调用这个函数，你需要指定keyword arguments通过获得：

p = get_object_or_404(Product, slug=product_slug)

由于Django不知道通过哪个字段获取您的Product模型，这就是为什么您会收到ValueError: need more than 1 value to unpack。

来源

2017-08-13 18:34:59 wencakisa

谢谢，看来它的工作，但现在显示我没有产品匹配给定的查询。 – Gozie

您可以在视图中打印'product_slug'参数并查看它的外观？ – wencakisa

对不起，我不明白。打印它如何？ – Gozie

我想你'试图找到Product与product_slug在url中，对吧？

p = get_object_or_404(Product, slug=product_slug)是找到由其字段过滤的对象的正确方法。

get_object_or_404要求您传递除类模型以外的任何参数以便通过get()或filter()方法可接受。

来源

2017-08-13 18:34:14

django值错误需要多个值才能解压

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