get_absolute_url()的问题

Question

求求你我需要你的帮助。我不能将urls从模型返回到模板。我认为这个问题存在于get_absolute_url方法中。这是我得到的错误：

NoReverseMatch at /
Reverse for 'product_list' with arguments '('saws',)' not found. 1 pattern(s) tried: ['$']

代码为：

# models
class Category(models.Model):
    name = models.CharField(verbose_name='Category', max_length=100, db_index=True)
    slug = models.SlugField(max_length=100, db_index=True,
                            unique=True)
...
    def get_absolute_url(self):
        return reverse('core:product_list',
                       args=[self.slug])

urls.py

app_name = 'core'

urlpatterns = [
    path('', views.ProductView.as_view(), name='product_list'),]
    #url(r'^$', views.ProductView.as_view(), name='product_list'),

views.py

class ProductView(generic.ListView):
    queryset = Product.objects.filter(available=True)
    paginate_by = 3
    form_class = QuantityForm
    categories = Category.objects.all()


    def category_slugg(self, category_slug=None):
        if category_slug:
            category = get_object_or_404(Category, slug=category_slug)
            return category


    def get_context_data(self, **kwargs):
        context = super(ProductView, self).get_context_data(**kwargs)
        context['Products'] = self.form_class
        context['categories'] = self.categories
        context['category'] = self.category_slugg
        return context

html

<li {% if not category %}class="selected"{% endif %}>
 <a href="{{ categories.get_absolute_url }}"All</a>
</li>
{% for c in categories %}
 <a href="{{ c.get_absolute_url }}">{{ c.name }}</a> <!--if delete 'c.get_absolute_url', except escape-->
{% endfor %}

Answer 1

你的url path不接受任何参数，但是你给它传递了一个slug。

您需要在URL中允许该插件；

path('<slug:category_slug>/', views.ProductView.as_view(), name='product_list'),

在django文档中有一个这样的例子：https://docs.djangoproject.com/en/3.0/topics/http/urls/#examples

Answer 2

尝试将args=[self.slug]更改为kwargs={'slug': self.slug}，然后在urls.py中：

urlpatterns = [
    path('<str:slug>/', views.ProductView.as_view(), name='product_list'),
    ]

这个想法是get_absolute_url从urls接收kwargs。