页面找不到 (404) - 没有匹配给定查询的产品

Question

我正在写一个Django博客，并实现了slug for detail页面。我偶然发现了一个问题。在

Page not found (404) Request Method: GET Request

URL: http://127.0.0.1:8000/susu/ Raised

by: myshop.views.product_detail

No Product matches the given query.

这是我的我的店铺/网址.py文件

from django.conf.urls import url
from . import views

app_name = 'myshop'
urlpatterns = [
    url(r'^$', views.product_list, name='product_list'),
    url(r'^(?P<product_slug>[-\w]+)/$', views.product_detail, name='product_detail'),
    url(r'^(?P<category_slug>[-\w]+)/$', views.product_list, name='product_list_by_category'),
]

这是我的网址.py文件

^{pr2}$

这是我的视图.py文件

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

# Create your views here.

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

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

这是我的模型.py文件

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

# Create your models here.

class Category(models.Model):
    name = models.CharField(max_length=200)
    slug = models.SlugField(max_length=200, unique=True)

    def __str__(self):
        return self.name

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

class Product(models.Model):
    category = models.ForeignKey(Category, related_name='products', on_delete=None)
    name = models.CharField(max_length=200)
    slug = models.SlugField(max_length=200)
    image = models.ImageField(upload_to='products/%Y/%m/%d', blank=True)
    description = models.TextField(blank=True)
    price = models.DecimalField(max_digits=10, decimal_places=2)
    stock = models.PositiveIntegerField()
    available = models.BooleanField(default=True)
    created = models.DateTimeField(auto_now_add=True)
    updated = models.DateTimeField(auto_now=True)

    def __str__(self):
        return self.name

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

我尝试在url模式中重新排序url条目 从

urlpatterns = [
    url(r'^$', views.product_list, name='product_list'),
    url(r'^(?P<product_slug>[-\w]+)/$', views.product_detail, name='product_detail'),
    url(r'^(?P<category_slug>[-\w]+)/$', views.product_list, name='product_list_by_category'),
]

到

urlpatterns = [
    url(r'^$', views.product_list, name='product_list'),
    url(r'^(?P<category_slug>[-\w]+)/$', views.product_list, name='product_list_by_category'),
    url(r'^(?P<product_slug>[-\w]+)/$', views.product_detail, name='product_detail'),
]

结果是我可以加载http://127.0.0.1:8000/susu/页面（susuu is类别） 但我无法加载http://127.0.0.1:8000/susu-vanilla/页面（susu-vanilla是产品） 这就是错误

Page not found (404) Request Method: GET Request

URL: http://127.0.0.1:8000/susu-vanilla/ Raised

by: myshop.views.product_list

No Category matches the given query.

有人能帮我吗？ 对不起，我的英语不好，谢谢

Answer 1

你不能有这两个URL模式。Django永远会和第一个匹配。在

url(r'^(?P<product_slug>[-\w]+)/$', views.product_detail, name='product_detail'),
url(r'^(?P<category_slug>[-\w]+)/$', views.product_list, name='product_list_by_category'),

典型的解决方案是向一个（或两个）正则表达式添加前缀，例如：

^{pr2}$