FBV中的get_absolute_url方法

在FBV(Funtional-Base View)中反向获取url的方式是重载get_absolute_url方法。
电子购物网站的模型：

from django.db import models
from django.urls import reverse


class Category(models.Model):
    name = models.CharField(max_length=150, db_index=True)
    slug = models.SlugField(max_length=150, unique=True ,db_index=True)
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)

    class Meta:
        ordering = ('name', )
        verbose_name = 'category'
        verbose_name_plural = 'categories'

    def __str__(self):
        return self.name

    def get_absolute_url(self):
        return reverse('shop:product_list_by_category', args=[self.slug])


class Product(models.Model):
    category = models.ForeignKey(Category, related_name='products', on_delete=models.CASCADE)
    name = models.CharField(max_length=100, db_index=True)
    slug = models.SlugField(max_length=100, db_index=True)
    description = models.TextField(blank=True)
    price = models.DecimalField(max_digits=10, decimal_places=2)
    available = models.BooleanField(default=True)
    stock = models.PositiveIntegerField()
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)
    image = models.ImageField(upload_to='products/%Y/%m/%d', blank=True)

    class Meta:
        ordering = ('name', )
        index_together = (('id', 'slug'),)

    def __str__(self):
        return self.name

    def get_absolute_url(self):
        return reverse('shop:product_detail', args=[self.id, self.slug])

视图 views.py

from django.shortcuts import render, get_object_or_404
from .models import Category, Product


def product_list(request, category_slug=None):
    category = None
    categories = Category.objects.all()
    products = Product.objects.filter(available=True)
    if category_slug:
        category = get_object_or_404(Category, slug=category_slug)
        products = Product.objects.filter(category=category)

    context = {
        'category': category,
        'categories': categories,
        'products': products
    }
    return render(request, 'shop/product/list.html', context)


def product_detail(request, id, slug):
    product = get_object_or_404(Product, id=id, slug=slug, available=True)
    context = {
        'product': product
    }
    return render(request, 'shop/product/detail.html', context)

路由urls.py

from django.urls import path, re_path

from . import views

app_name = "shop"

urlpatterns = [
        path("", views.product_list, name="product_list"),
        re_path(r"^(?P<category_slug>[\w-]+)/$", views.product_list,
            name="product_list_by_category"),
        re_path(r"^(?P<id>\d+)/(?P<slug>[\w-]+)/$", views.product_detail,
            name="product_detail"),
        ]

这是在html页面的逻辑：
list.html

     {% for product in products %}
                      <div class="col-md-4">
                        <div class="thumbnail">
                            <a href="{{ product.get_absolute_url }}">
                                <img src="{% if product.image %} {{ product.image.url }} {% else %} {% static 'img/default.jpg' %} {% endif %}" alt="..." style="height: 130px; width: auto">
                            </a>
                            <div class="caption">
                                <h3 class="text-center">
                                    <a href="{{ product.get_absolute_url }}">{{ product.name }}</a>
                                </h3>
                                <p class="text-center">Kshs. {{ product.price }}</p>
                            </div>
                        </div>
                      </div>
                  {% endfor %}

页面逻辑：
在product.get_obsolute_url里面用的是product.id和product.slug来连接到该product的detail.html。