Django 3.0：反向查找“ product”，未找到任何参数。尝试了1个模式：['product /（？P <slug> [^ /] +）/ $']

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我在models.py文件中有一个名为Book的模型。 这个模型有一个塞子字段来显示书籍的详细信息 书籍将显示在home.html模板中，而product.html模板将显示所选书籍的详细信息。

我对以及它们的工作原理了解不多。

Models.py：

class Book(models.Model):
    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    title = models.CharField('Title', max_length=255)
    authors = models.ManyToManyField(Author, related_name='books_written')
    publisher = models.ForeignKey(Publisher, on_delete=models.DO_NOTHING, related_name='books_published')
    price = models.DecimalField('Price', decimal_places=2, max_digits=10)
    description = models.TextField('Description')
    upload_timestamp = models.DateTimeField('Uploading DateTime', auto_now_add=True)
    categories = models.ManyToManyField(Category, related_name='book_category')
    cover = models.ImageField(upload_to='covers', null=True,blank=True)
    copyright_proof = models.ImageField(upload_to=book_copyrights_path, null=True,blank=True)
    slug = models.SlugField(max_length=100,blank=True)

    def get_absolute_url(self):
        return reverse("bookrepo:product", kwargs={
            'slug': self.slug
        })

    def __str__(self):
        return "Title: {} | Authors: {} | Price: {}".format(
            self.title, self.get_authors(), self.price
        )

urls.py

app_name = 'bookrepo'

urlpatterns = [
    path('product/<slug:slug>/', ItemDetailView.as_view(), name='product'),     
    path('',views.home,name='home'),
    path('about/',views.about,name='about'),
    path('faq/',views.faq,name='faq'),
    path('login/',views.user_login,name='login'),
    path('shop/',views.shop,name='shop'),
    path('signup/',views.registration,name='signup'),
    path('logout/', views.user_logout, name='logout'),
]

views.py

class ItemDetailView(DetailView):
    model = Book
    template_name = "bookrepo/product.html"
    def main(self, *args, **kwargs):
        # kwargs key should be equal to parameter passed from url
        slug_from_param = self.kwargs.get('slug')

def home(request):
    bookz = Book.objects.order_by('title')
    var = {'books': bookz, 'range': 10}
    return render(request, 'bookrepo/home.html', context=var)

home.html

<div class="row">
    {% load my_filters %}
        {% for b in books|slice:":10" %}
            <div class="col-lg-2 col-md-3 col-sm-4">
                <div class="item">
                    <img src="{{ b.cover.url }}" alt="book-image">
                    <h6>{{ b.title }}</h6>
                    <h6>{{ b.get_authors }}</h6>
                    <h6><span class="price">{{ b.price }}</span></h6>

                    <a href="{% url 'bookrepo:product' b.slug %}" class="btn btn-sm my-btn detail-btn">
                        <span><i class="fa fa-info-circle"></i></span>Book Details
                    </a>

                </div>
            </div>
        {% endfor %}
 </div>

老实说，我对和基于类的视图了解不多。我只使用了基于函数的视图。而且，通过搜索互联网，我发现了这种“笨拙”的方式来获取详细信息页面的网址。

在html模板中，我尝试过这种方式：（获得相同的结果）

<a href="{{ item.get_absolute_url }}" class="btn btn-sm my-btn detail-btn">