django中具有2个slug参数的noreversematch

我有以下问题。

我想查看此URL的详细信息: 127.0.0.1:8000/<category-name>/<product-name> ( category-name 和 product-name 是slug字段)。请帮忙:(

我的错误:

NoReverseMatch at /products/ Reverse for 'ProductDetail' with arguments '('new-things', 'flower-pot')' not found. 1 pattern(s) tried: ['products\\/\\<slug\\:category\\.slug\\>\\/\\<slug\\:product\\.slug\\>$']

我的(相关部分)index.html:

{% for p in Product %}
  <a href="{% url 'product:ProductDetail' p.category.slug p.slug %}">{{ p.name}}</a>
{% endfor %}

我的(相关部分)url.py:

from .models import *

app_name = 'product'
urlpatterns = [
    path('product/<slug:category.slug>/<slug:product.slug>', views.ProductDetailView.as_view(), name="ProductDetail"),
]

和(相关部分)my models.py:

    class Product(models.Model):
        name = models.CharField(max_length=100)
        description = models.TextField()
category = models.ForeignKey(Category, on_delete=models.CASCADE)
        slug = models.SlugField(blank=True, null=True)

            def save(self, *args, **kwargs):
                if not self.id:
                    # Newly created object, so set slug
                    self.slug = slugify(self.name)

                super(Product, self).save(*args, **kwargs)

            def __str__(self):
                return self.name


class Category(models.Model):
    name = models.CharField(max_length=100)
    description = models.TextField()
    slug = models.SlugField(blank=True, null=True)

        def save(self, *args, **kwargs):
            if not self.id:
                # Newly created object, so set slug
                self.slug = slugify(self.name)

            super(Category, self).save(*args, **kwargs)

        def __str__(self):
            return self.name